广东省深圳市宝安区新安中学(集团)外国语学校2019-2020学年七年级下册第一次联考测试数学试卷

合集下载

2020-2021深圳市新安中学七年级数学下期末第一次模拟试卷(含答案)

【详解】
解：A、1600名学生的体重是总体，故A正确；
B、1600名学生的体重是总体，故B错误；
C、每个学生的体重是个体，故C错误；
D、从中抽取了100名学生的体重是一个样本，故D错误；
故选：A．
【点睛】
本题考查了总体、个体、样本、样本容量，解题要分清具体问题中的总体、个体与样本，关键是明确考查的对象．总体、个体与样本的考查对象是相同的，所不同的是范围的大小．样本容量是样本中包含的个体的数目，不能带单位．
A．（2，﹣1）B．（4，﹣2）C．（4，2）D．（2，0）
12．某中学计划租用若干辆汽车运送七年级学生外出进行社会实践活动，如果一辆车乘坐45人，那么有35名学生没有车坐；如果一辆车乘坐60人，那么有一辆车只坐了35人，并且还空出一辆车．设计划租用x辆车，共有y名学生．则根据题意列方程组为（）
A． B．
B、∠A＝∠EBD不能判断出EB∥AC，故B选项不符合题意；
C、∠C＝∠ABC只能判断出AB＝AC，不能判断出EB∥AC，故C选项不符合题意；
D、∠A＝∠ABE，根据内错角相等，两直线平行，可以得出EB∥AC，故D选项符合题意．
故选：D．
【点睛】
此题考查平行线的性质，正确识别“三线八角”中的同位角、内错角、同旁内角是解题的关键，只有同位角相等、内错角相等、同旁内角互补，才能推出两被截直线平行．
A． B． C． D．
7．如图，把一个直角三角尺的直角顶点放在直尺的一边上，若∠1＝50°，则∠2＝（）
A．20°B．30°C．40°D．50°
8．如图，已知∠1+∠2＝180°，∠3＝55°，那么∠4的度数是（）
A．35°B．45°C．55°D．125°
9．下列图中∠1和∠2是同位角的是( )

2019-2020学年深圳市宝安区第一学期七年级答案V4.0 20191030(1)

2019-2020学年第一学期宝安区期末调研测试卷七年级语文答案一、单项技能考查（每题2分，共10分）1. C（A 贮 zhù澄chéng B庇bì咄duō D琢zhuó匐 fú）2.A（B云霄 C菜畦 D狭隘）3.B（喜出望外：遇到出乎意料的喜事而特别高兴。

平时学习刻苦认真，取得好成绩在意料之中，用“喜出望外”不妥。

）4.D （③句引出下文，写在胡杨林看到的景物；⑥句中的薄雾跟⑤句中的雾气有明显的关联，—个而字，可以看出⑤是承接⑥的转折句。

①④②句是写骑着白马的骑手，②句的“他”承接④句的骑手。

故答案为D．③⑥⑤①④②。

）5.C（刘义庆是南朝宋文学家，宋是中国南北朝时代南朝的第一个朝代）二、诗文能力考查（24分）（一）课内外文言文阅读考查（12分）6. ⑴淫慢则不能励．精。

（振奋）⑵年与时驰．，意与日去。

（疾行，指迅速逝去）⑶遂．不能有所成。

（于是，就）⑷故．特作书戒之。

（所以，因此）7（1）不能淡泊自守就无法明确志向，不能宁静专一就无法达到远大目标。

（2）希望你们一定要仔细思考我说的话并深刻反省自己呀！8．甲文告诫自己的孩子（1分）要静心学习、俭朴养德（1分）。

乙文希望诸弟（1分）戒除傲气自满之气（1分）。

【文段二译文】三房十四叔不是不勤读，只因傲气太盛，自满自足，便不能有所成就。

京城之中，也有不少自满的人，有见识的人看见他们，不过冷笑一声罢了。

又有当名士的，把科名看得和粪土一样，或者喜欢作点古诗，或者搞点考据，或者好讲理学，沸沸扬扬自以为压倒一切。

有学识的人见了，认为他们的成就也没有多少，也只好冷笑一声罢了。

所以我们用功，去掉傲气，力戒自满，不为别人所冷笑，才有进步。

弟弟们平时都谨慎退让，但多年小考没有中，恐怕是因为愤激已久，以致产生骄惰的习气，所以特别写信告诫。

务必要仔细想一想我说的话深切地省察！幸甚幸甚！1。

2019年深圳市深圳外国语学校七下期中考试

深圳外国语学校2019-2020学年第二学期七年级期中测试数学试卷一、选择题1.下列各题的计算中，正确的是A.()532a a =B.()63293a a -=- C.()()76a a a -=-⋅- D.6332a a a =+ 2.已知，1=+b a 则b b a 222+-的值为 A.1 B.3 C.4 D.03.若()()，223y x xy =-⨯则括号里应填的单项式是 A.y 3- B.xy 3 C.xy 3- D.y x 234.若()()()，nx x x x -=++-164222则n 的值等于 A.6 B.4 C.3 D.25.下列多项式,为完全平方式的是A.241a +B.1442-+b bC.442+-a aD.22b ab a ++6.已知()613--+x a x 能被2-x 整除,则a 的值为 A.1 B.-1 C.0 D.27.已知直线，∥21l l 一块含30°角的直角三角板如图所示放置，∠1=35°，则∠2等于A.25°B.35°C.40°D.45°8.如图，三角形纸片ABC 中，∠A=65°，∠B=75°，将∠C 沿DE 对折，使点C 落在△ABC 外的点'C 处，若∠1=20°，则∠2的度数为A.80°B.90°C.100°D.110°9.下列尺规作图，能判断AD 是△ABC 边上的高是10.一定能确定△ABC ≌△DEF 的条件是A.AB=DE,BC=EF,∠A=∠DB.∠A=∠E,AB=EF,∠B=∠DC.∠A=∠D,AB=DE,∠B=∠ED.∠A=∠D,∠B=∠E,∠C=∠F11.在如图的方格纸中，每个小方格都是边长为1的止方形，点A 、B 是方格纸中的两个格点(即正方形的顶点)，在这个5×5的方格纸中，找出格点C 使△ABC 的面积为2个平方单位，则满足条件的格点C 的个数是A.5B.4C.3D.212.如图，在△ABC 中，∠BAC=90°，AD 是高，BE 是中线，CF 是角平分线，CF 交AD 于点G ，交BE 于点H ，下面说法不正确的是A.△ABE 的面积=△BCE 的面积B.∠AFG=∠AGFC.BH=CHD.∠MAG=2∠ACF二、填空题13.计算:=⎪⎭⎫ ⎝⎛÷-23212x x ________. 14.若()，1512=--x 则x 的值是________. 15.如图，直线，∥n m 以直线m 上的点A 为圆心，适当长为半径画弧，分别交直线n m 、于点B 、C ，连接AC 、BC ，若∠1=30°，则∠2=______°.16.已知:如图，BD 为△ABC 的角平分线，且BD=BC ，E 为BD 延长线上的一点，BE=BA ，过E 作EF ⊥AB ，F 为垂足，下列结论:①△ABD ≌△EBC ；②∠BCE+∠BCD=180°；③AD=EF=EC ；④AE=EC ，其中正确的是________(填序号)三、解答题17.化简:(1)()324232b a b a ÷- (2)()()()23125--+-x x x18.已知，，3223==m m y x 求()()()m m m m y y x y x ⋅-+32632的值。

2019-2020学年广东省深圳市宝安区七年级(下)期末英语试卷(附答案详解)

2019-2020学年广东省深圳市宝安区七年级（下）期末英语试卷一、单选题（本大题共15小题，共15.0分）1.--The doctor told me to give up eating junk food.--He's right.Junk food is bad for our health.（）A. enjoyB. keepC. stop2.These two dresses are both nice, but I prefer the purple one.（）A. want…bestB. like…betterC. enjoy…less3.-This summer holiday,I will go sightseeing in Shanghai.-Wish you a good trip！（）A. enjoy myselfB. buy beautiful thingsC. visit interesting places4.-The boy is known as"the hero of the village".-Yes,because he rescued a little girl from the river.（）A. returnedB. savedC. gave5.-After looking for a job for months,he found one finally.-Really？What does he do now？（）A. in a wayB. at lastC. at first6.-Yesterday was your birthday.What did you do？-Well,nothing special.It was just an ordinary day for me.（）A. usual dayB. an unusual dayC. a different day7.-The information is valuable.Thank you.-That's all right.I'm glad that I can help.（）A. quite newB. very carefulC. very useful8.-Can we go now？-Sorry,please wait a moment.I have something to deal with.（）A. a second timeB. a long timeC. a short time9.-In many buildings,hot water runs _________pipes to keep rooms warm.-Yes,it's very common（常见的）in the north.（）A. besideB. acrossC. through10.-Here is the menu.Please______ the dish you like with the pencil.-Well,thanks.Would you please get me a glass of water first？（）A. giveB. pickC. miss11.-Where should I put my coat？-_________you like.Just make yourself feel at home.（）A. ElsewhereB. NowhereC. Anywhere12.-Did the famous star_______ in the concert？-No.It's said he didn't come to our city at all.（）A. appearB. launchC. interview13.-How is your stage play（舞台剧）going？-Not good.No one would like to _______the bad man in it.（）A. actB. pushC. laugh14.Over the past 10 years,he has _______more than 100，000 photos of trains in nearly 30countries and regions（地区）.（）A. boughtB. takenC. drawn15.-_______water refers to water that is not salty.-Yes.It's important in our daily life.（）A. FreshB. CleanC. Safe二、完形填空（本大题共10小题，共10.0分）John is a policeman.He helps to(16)us and our things safe.He is busy with his work.He lives with his parents.But it's(17) his work,and it (18) him one and a half hours on the bus every day,so he leaves his parents' home and finds a new house near the place he works.It is Mother's Day today.He doesn't have time(19)home.He buys some roses at a flower shop.And he asks the shop assistant to send them to his(20)for him.At this time,a little boy comes in.He wears a（n）(21) T-shirt."How many roses can I get for only five dollars？"The little boy asks.The shop assistant tells him the roses are expensive,and he can buy some carnations（康乃馨）."No,my mum is ill,but I don't have time to be with her,so I want to get the best thing for my mum.Roses are her favourite."After hearing this,John knows(22)the boy feels.It is not easy for the boy to buy them,(23) John buys the boy the roses.The boy is so happy and runs out.John(24)the boy to go out.He finds that the boy walks into a cemetery（公墓）.He cries and says,"God,please help me (25)my mum and tells her how much I love her."After seeing this,John comes back to the shop.He wants to take the flowers home himself.16. A. let B. keep C. bring17. A. near B. close to C. far from18. A. makes B. needs C. takes19. A. to go B. to get to C. to arrive at20. A. father B. Mother C. grandma21. A. old B. new C. big22. A. why B. what C. because23. A. but B. so C. because24. A. follows B. sends C. waits25. A. bring B. find C. take三、阅读理解（本大题共20小题，共30.0分）AShopping online is one of the most important part of life now.Taobao is China's largest online shopping website.People spend lots of money on Taobao every year.Now more and more Internet users enjoy online shopping.More online shoppers are students or young workers.More women shop online than men.Clothing and home-use products are the most popular online.It's said that people spent more than 250 billion yuan on online shopping last year,80% through Taobao.People can find almost everything they need on Taobao,from clothes to books,DVD players and so on.Shopping on it is very safe and convenient.too.You can finish it without leaving home.If you receive the products from the sellers,but you aren't happy with them,the shop keeper will not get the money.You can also get your money back if you want to return the products.26.According to the article,we know Taobao is ______ .A. a shopping mallB. an online shopperC. an online shopping siteD. a supermarket27.Most online shoppers are ______ .A. youngB. oldC. babiesD. mothers28.What are the most popular products on Taobao？______A. Clothes and DVD players.B. Clothes and books.C. Food and clothing.D. Clothing and home-use products.29.What does the underlined word "convenient" mean in Chinese？______A. 有竞争的.B. 方便的.C. 附近的.D. 适合的.30.What is the passage about？______A. Our romantic life.B. Our convenient life.C. Safe shopping online.D. Shopping on Taobao.BDo you know Singapore？Yeah．It's a beautiful and clean country and it's in Southeast Asia．The weather there is warm all year round．There are lots of trees，flowers and rivers in the country．So it is good and fun for people to have a vacation in Singapore．There are also many Chinese people in Singapore．So you can eat different kinds of Chinese food，such as dumplings，rice and noodles．They are all delicious!If you go to Singapore one day，you must go to visit Sentosa．Sentosa means"peace and quiet"in Malay．It is very popular with people from all over the world．There are some peaceful butterflies，pink dolphins and elephants there．If you go to Singapore，you'll have a good time．31.Singapore is a（n）______ ．A. cityB. countryC. islandD. river32.Which of the following is TRUE？______A. There are few flowers and trees in Singapore．B. It's warm all year round in Singapore．C. You can't swim all year round in SingaporeD. You can't eat dumplings in Singapore．33.Which Chinese food can you find in Singapore？______A. Dumplings．B. Rice．C. Noodles．D. All of the above．34.What does Sentosa mean in Malay？______A. Happiness and peace．B. Peace and warm．C. Happiness and quiet．D. Peace and quiet．35.Which animals aren't there in Sentosa？______A. Butterflies．B. Pink dolphins．C. Pandas．D. Elephants．CIn the US，people prefer waiting for a table to sitting with people they don't know.This means a hostess may not seat a small group until a small table is available（有空的），even if a large one is.If you are sitting at a table with people you don't know,it is impolite to light up a cigarette （香烟）without asking if it will disturb（打扰）them.At American restaurants and coffee shops you are usually served tap water before you order.You may find the bread and butter is free,and if you order coffee,you may get a free refill. Most cities and towns have no rules about opening and closing time for stores or restaurants,though they usually make rules for bars.Especially in large cities,stores may be open 24 hours a day.Serving in restaurants is often large；too large for many people.If you can't finish your meal but would like to enjoy the food later,ask your waitress or waiter for a "doggie bag".It may have a picture of a dog on it,but everybody knows you're taking the food for yourself.Supper and dinner are both words for the evening meal.Some people have "Sunday dinner".This is an especially big noon meal.Tips are not usually added to the check（支票）.They are not included in the price of the meal,either.A tip of about 15%is expected and you should leave it on the table when you leave.In some restaurants,a check is brought on a plate and you put your money there.Then the waiter or waitress brings you your change.36.Which statement is true？______A. American people like sitting with people they don't know.B. A hostess al ways seats a small group at a large table.C. American people never sit with people they don't know.D. American people would not light a cigarette if it will disturb others.37.What is served before you order？______A. Bread.B. Butter.C. Coffee.D. Cold water.38.What do American people always do when servings are too large for them？______A. They take the food home with a doggie bag for their dogs.B. They leave the food on the table and go away.C. They take the food home with a doggie bag and enjoy the food later.D. They ask the waitress or waiter to keep the food for them.39.Sunday dinner is ______ .A. a dinner in the eveningB. a big noon mealC. a big lunch on SundayD. a supper on Sunday40.If the price of the meal is ＄60，you should tip the waiter ______ in America.A. ＄15B. ＄9C. ＄3D. ＄1DFeb.17 should be the start of the spring semester for many middle and primary schools in China.However,to control the new coronavirus outbreak（新型冠状病毒），many schools delayed，following instructions from the Ministry of Education（MOE）.Students in China are still studying.Many students in Beijing and Guangzhou began their first day of online classes instead of having class at school on Feb 17.Students in Shanghai will start online classes on March 2."In the morning,I have English class.followed by Chinese and math,"Liu Bo,a junior 3 student from Beijing,told Xinhua"I have also learned about epidemic prevention（疫情防护）"According to the MOE，students are mainly taking classes to review previous knowledge rather than taking new classes during the online study period.Online courses are made up of epidemic prevention,psychological health（心理健康）and educational activities."Online courses are only temporary measures（暂时的措施）taken during the epidemic,so when the new semester begins,schools should not replace（代替）classroom teaching with online classes,"Lu Yugang from the ministry told China Daily.The ministry also called on schools not to increase their students' schoolwork burden（负担）.Schools should not ask students to study online for long periods of time or study things beyond（超出）their curriculum（课程）.Students must have enough time to rest,the ministry added.Also,it stressed that protecting students' eyesight must come first.41.Many Beijing students are taking online courses these days because ______ .A. it's more convenient to have class onlineB. Spring Festival is not finished yetC. they need more time to rest at homeD. it can help control the new coronavirus outbreak42.What's the meaning of the underlined word "delayed" in Paragraph 1？______A. 改变.B. 延迟.C. 重启.D. 庆祝.43.The online courses are made up of those except ______ .A. reviewing previous knowledgeB. taking new classesC. learning about infection preventionD. learning about psychological health44.What can we learn from Lu Yuyang ？______A. Online courses can't replace classroom teaching.B. Online courses will last for a long time.C. Online courses should not be used in the future.D. Online courses should be widely developed.45.Which one of the followings isn't mentioned（提及）in the passage？______A. When the online courses start.B. What the online courses teach.C. How to correctly provide online courses.D. How students have exams through online courses.四、单词拼写/单词释义（本大题共1小题，共10.0分）46.What will happen without forests？A lot of (1) （plant）will die and the animals will lose(2) （they）homes.In many places the new farmland will soon look like the olddeserts.Crops will not grow there.There won't be enough (3) （rainy），and the weather will get hot and dry. (4) the climate of the earth changes,life will be (5) （difficulty）for everyone.More and more rich farmland will (6) （appear）.We will suffer from both droughts（干旱）(7) flood.It is our duty to protect forests (8) （good）.Everyone should try his best to take care (9) forests.Stop (10) （cut）trees and make the world greener！五、书面表达（本大题共1小题，共15.0分）47.根据汉语提示，把下列短文翻译成英语小短文。

【最新】2019-2020学年深圳市宝安区七年级下期中考试数学试卷(有答案).doc

8
∴∠ 1＝∠ 2＝60° （等量代换）又∵∠ ABD＝ 85°（已知） ∴∠ A＝ 180°﹣∠ ABD﹣∠ 1＝ 35°（三角形三内角和为 180°），故答案为：同旁内角互补、两直线平行； ∠ 3；两直线平行、同位角相等；对顶角相等；等量代换； 35°． 21．【解答】解：∵ CD是 AB边上高， ∴∠ BDF＝ 90°， ∠ ABE＝∠ BFC﹣∠ BDF＝113°﹣ 90°＝ 23°， ∵ BE为角平分线， ∴∠ CBF＝∠ ABE＝ 23°， ∴∠ BCF＝ 180°﹣∠ BFC﹣∠ CBF＝ 44°． 22．【解答】解：当 a+b＝ 4， ab＝ 2 时，（ 1）原式＝ a2﹣ 2ab+b2 ＝ a2+2ab+b2﹣ 4ab ＝（ a+b） 2﹣ 4ab ＝ 16﹣ 4× 2 ＝8 （ 2）原式＝ a2+b2+2ab﹣2ab ＝（ a+b） 2﹣ 2ab ＝ 16﹣ 4 ＝ 12 23．【解答】解：（ 1）∵△ ABC是等边三角形， ∴ AB＝ AC，∠ B＝∠ PAC＝ 60°，
2019-2020 学年广东省深圳市宝安区七年级（下）期中数学试卷
一、选择题（每小题 3 分，共 36 分）
1．（3 分）下列计算正确的是（
）
A． a3?a2＝a6
B． a3﹣a2＝ a
C．（﹣ a3） 2＝ a6
D． a6÷ a2＝ a3
2．（3 分）下列各式中不能用平方差公式计算的是（
）
A．（ 2x+y）（ 2x﹣ y）
6．【解答】解：设第三边为故选： C．
c，则 9+4＞ c＞ 9 ﹣ 4，即 13＞ c＞ 5．只有 9 符合要求．

2020年深圳市宝安区七下期末调研

2019-2020学年第二学期宝安区期末调研测试卷七年级数学2017.07第一部分(选择题，共36分)一、选择题(本题共有12小题，每小题3分，共36分。

)1．计算12-的结果是（） 21.A 21.-B2.-C 2.D 2．下列图形中，是是轴对称图形的是（）3．人体中成熟个体红细胞的直径约为0．0000077米的细菌，将数据0．0000077用科学记数法表示为（）A 、6107.7⨯B 、51077-⨯C 、6107.7-⨯D 、71077.0-⨯4．下列运算正确的是（）A ．623a a a =⋅B ．42833a a a =÷C ．()9322-=-x xD ．()933a a =5．下列事件中，随机事件是（）A 、任意一个三角形的内角和是180º；B 、打开电视，正在播出“亚冠”足球比赛；C 、通常情况下，向上抛出篮球，篮球会下落；D 、袋子中装有5个红球，摸出一个白球；6．如图1，已知直线a 、b 被直线c 所截，若a ∥b ，∠1=130º，则∠2的度数是（）A 、30ºB 、40ºC 、50ºD 、60º7．若有四根木棒，长度分别为4,5,6,9（单位：cm ），从中任意选取三根首尾顺次连接围成不同的三角形，下列不能围成三角形的是（）A ．4，5，6B ．4，6，9C ．5，6，9D ．4，5，98．在五张完全相同的卡片上，分别写有数字-2， -1， 0， 1， 2，现从中随机抽取一张，抽到写有正数的卡片的概率是（）A 、51B 、52C 、53D 、549．某天小明骑自行车上学，途中因自行车发生故障，修车耽误了一段时间后继续骑行，按时赶到了学校。

如图2中描述了他上学的途中离家距离S（米）与离家时间t（分钟）之间的函数关系，下列说法中正确的个数是（）⑴中途修成时间为5分钟；⑵到达学校时共用时间20分钟；⑶学校离家的距离为2000米；⑷修车后的骑行平均速度是修车前平均速度的2倍；A、1个B、2个C、3个D、4个10．如图3，点E、F在AC上，AE=CF，∠A=∠C，添加下列条件后仍不能使△ADF≌△CBE的是（）A、DF=BEB、∠D=∠BC、AD=CBD、∠AFD=∠CEB 图311．如图4，边长为（a+2）的正方形纸片剪出一个边长为a的正方形之后，剩余部分可剪拼成一个长方形（不重叠无缝隙），若拼成的长方形一边长为2，则另一边长是（）A．2 B．2a+4 C．2a+2 D．4a+412．如图5，BE⊥AE，CF⊥AE，垂足分别为E、F，D是EF的中点，CF=AF。

2020~2021学年广东深圳宝安区初一下学期期末英语试卷-学生用卷

2020~2021学年广东深圳宝安区初一下学期期末英语试卷-学生用卷一、完成句子（本大题共2小题，每小题1分，共2分）1、【来源】 2020~2021学年广东深圳宝安区初一下学期期末第19题1分翻译。

你想知道Daisy多久参加一次学校旅行，你问Daisy：2、【来源】 2020~2021学年广东深圳宝安区初一下学期期末第20题1分翻译。

你想知道Daisy对学校旅行的看法，你问Daisy：二、选择题（本大题共10小题，每小题0.5分，共5分）3、【来源】 2020~2021学年广东深圳宝安区初一下学期期末第21题0.5分—Why do you like reading books by Lu Xun?—Because his books always encourage me to study hard.A. give…a lot of hopeB. make…feel sadC. make…feel moved4、【来源】 2020~2021学年广东深圳宝安区初一下学期期末第22题0.5分—More and more people are willing to be volunteers in Shenzhen.—Helping those in need is a valuable experience for them.A. boring and helplessB. useful and importantC. simple and useless5、【来源】 2020~2021学年广东深圳宝安区初一下学期期末第23题0.5分—Do you know anything about Alzheimer disease （阿尔茨海默病）?—Yes, I do. People with the disease always forget things.A. cannot rememberB. do not wantC. cannot plan6、【来源】 2020~2021学年广东深圳宝安区初一下学期期末第24题0.5分—Many people do not like playing with Tom because he is foolish.—I don't think so. In my opinion, Tom is an interesting boy.A. smartB. funnyC. stupid7、【来源】 2020~2021学年广东深圳宝安区初一下学期期末第25题0.5分—A lot of animals are in danger now.—What bad news! All of us should take action to take care of animals.A. look aroundB. look likeC. look after8、【来源】 2020~2021学年广东深圳宝安区初一下学期期末第26题0.5分—Tom, will you take your foreign teachers to travel in Bao'an?—Sure. We just making a travelling plan. We will go tomorrow.A. allowedB. finishedC. practiced9、【来源】 2020~2021学年广东深圳宝安区初一下学期期末第27题0.5分—Never give up, Tim. You can your dream if you work hard.—Thank you, Miss Chen. I'll try my best.A. preferB. forgetC. achieve10、【来源】 2020~2021学年广东深圳宝安区初一下学期期末第28题0.5分—Amy, would you like to help us protect water?—Yes, I'd like to. I think I can do well because I work in a club for saving water.A. rushed toB. used toC. disagreed to11、【来源】 2020~2021学年广东深圳宝安区初一下学期期末第29题0.5分—Ben, you can't always depend on me. You should learn to look after yourself.—Yes, mum. I will try doing something.A. by myselfB. with your helpC. all day and all night12、【来源】 2020~2021学年广东深圳宝安区初一下学期期末第30题0.5分—What weather! Let's go camping on the coast.—I'd like to. But the epidemic（疫情） is still serious. We had better stay at home.A. terribleB. badC. perfect三、完形填空（本大题共10小题，每小题1分，共10分）13、【来源】 2020~2021学年广东深圳宝安区初一下学期期末第31~40题10分Reading a poem is enjoyable. Every now and then when you learn a poem, it attracts you and you just have to set it to memory. You want to live with it and1its wonderful lineswith others. Many people like poems and want to learn poems. However, how do you begin to memorize （背记）2?It's quite3: just start at the beginning and memorize the poem line by line. It's not as difficult as you think. Some poems may be harder than others, andthe4the poem is, the more time it will take to memorize it. Don't worry about that and take your time to really enjoy the process and5the hidden（隐藏的）meaning within the poem.When you are6to memorize a poem with your own understanding, you will find it is worth the effort（努力）. Let's look at the process of7 a poem.8, you need to read the poem over, slowly and aloud. Then you canuse9or a piece of paper to cover everything but the first line of the poem. Read it. Look away and say it. Repeat until you've got it. Do the same to the rest of the lines. In addition,to understand the whole poem, you can know every word's meaning first because a poem is made up of different10. Finally after you are familiar with a poem in this way, you can memorize it well.A. shareB. writeC. reciteD. copyA. lettersB. passagesC. booksD. poemsA. difficultB. helpfulC. simpleD. harmfulA. shorterB. longerC. betterD. worseA. rememberB. forgetC. overlookD. understandA. likelyB. unableC. comfortableD. ableA. writingB. memorizingC. reportingD. readingA. LastlyB. ThenC. First of allD. SecondA. a cardB. a ringC. an eraserD. a keyA. wordsB. rhymesC. linesD. verses四、阅读理解（本大题共15小题，每小题2分，共30分）14、【来源】 2020~2021学年广东深圳宝安区初一下学期期末（A篇）第41~45题10分Do you like drinking tea? I like it very much, so I want to tell you something about a kind of famous tea.(1) How much should Tom pay if he buys 200 grams of Biluochun?A. About 130-150 yuan.B. About 780-900 yuan.C. About 260-300 yuan.D. About 520-600 yuan.(2) What can we learn about Biluochun?A. Its shape is like a snail.B. It is a kind of black tea.C. It has a history of less than 1, 000 years.D. It can help people fall asleep much more easily.(3) Who may be interested in this poster?A. Emma—She is over-weighed.B. Cindy—She often feels excited.C. Lucy—She is thin and short.D. Dennis—He likes watching snails.(4) What should we know when we buy Biluochun?①the fragrance of the tea②the time the fragrance lasts③the color of the tea water④the long history of the teaA. ①②④B. ①③④C. ①②③D. ②③④(5) Why does the writer make this poster?A. To teach people how to make tea.B. To show his interest in drinking tea.C. To encourage people to buy Biluochun.D. To tell people something about Biluochun.15、【来源】 2020~2021学年广东深圳宝安区初一下学期期末（B篇）第46~50题10分The Nature Education Center at Shenzhen Bay Park in Futian District reopened to the public on the Saturday before June 1, the Children's Day.There are six education centers in total in Shenzhen. The center in Futian District is the first nature education center to reopen after coronavirus closure. It is open from 2 p.m. to 4 p.m., Wednesday to Sunday. The center only allows 20 people at a time to visit for social distancing.As the city is becoming safer during the pandemic, many parks have been reopened with strict prevention measures（预防措施）. And the parks have taken action to make sure a clean and safe environment for children.Shenzhen Children's Paradise Park in Futian District is ready for children to visit during the Children's Day this year. But the park limits the number of visitors to 20, 000 and will stop selling tickets once the limit is met.Xiangmi Park and the Dasha River Ecological Corridor are also good places for children and parents to enjoy outdoor activities on Children's Day.(1) What does the underlined word "closure" in Paragraph 2 probably mean?A. the opening once againB. the closing for a timeC. the reopening to the publicD. the shutting down forever(2) When can we visit the Nature Education Center?A. At 3 p.m. Saturday.B. At 3 p.m. Monday.C. At 5 p.m. Sunday.D. At 1 p.m. Thursday.(3) Why does the center only allow 20 people to enter at a time?A. It is not big enough for more people.B. Visitors need to keep social distancing.C. People don't know it's been reopened.D. Few people are interested in the center.(4) Which of the following is the main idea of the passage?A. The parks limit the number of visitors to 20, 000.B. The parks have very strict prevention measures.C. The workers can also have fun in Xiangmi Park.D. Parks in Futian District are reopening for children.(5) In which page of the newspaper can we find this passage?A. Person.B. Food.C. Sports.D. Local.16、【来源】 2020~2021学年广东深圳宝安区初一下学期期末（C篇）第51~55题10分Electric cars are cars that use electricity for power. They have anelectric motor which is powered by batteries or a fuel cell.There are different kinds of electric cars. Plug-in hybrids use both fossil fuel and battery. The battery of plug-in hybrids can be recharged（充电）. The second kind of electric cars is battery electric cars. It does not use any fuel. However, people can still drive it because it runs only on electricity. Another kind of electric cars are hydrogen（氢气）fuel cars. The power of it comes from hydrogen gas. When people are driving the cars, the hydrogen gas will help the battery make electricity.Electric cars produce less pollution than the most efficient conventional（传统的）cars. In other words, they are greener and more useful for protecting environment. Now more and more people are interested in electric cars. However, electric cars are not cheap, and sometimes you would even spend more money buying electric cars. Therefore, governments in some cities like Dongguan, Shenzhen and Guangzhou have taken action to encourage people to buy electric cars by giving them money in other ways.With electric cars becoming more and more popular, hopefully the environment will be greatly improved.(1) Which of the following do electric cars use for power?A. Solar power.B. Wind.C. Water.D. Electricity.(2) What kind of cars use both fossil fuel and battery?A. Hydrogen fuel cars.B. Plug-in hybrids.C. Battery electric cars.D. Fossil fuel cars.(3) Why do governments encourage people to buy electric cars?A. There are too many electric cars on sale.B. Electric cars are good for the environment.C. They want to get more money from people.D. The conventional cars are much more expensive.(4) What can we infer from the passage?A. Hydrogen can help all kinds of cars make electricity.B. Electric cars can solve all the environmental problems.C. More and more people will buy electric cars in the future.D. People don't want to buy electric cars because of the price.(5) What is the best title for the passage?A. Electric carsB. Fossil fuel carsC. Cars and environmentD. Cars and recharging五、六选五（本大题共5小题，每小题1分，共5分）17、【来源】 2020~2021学年广东深圳宝安区初一下学期期末第56~60题5分以下是一篇短文，请阅读全文，并从下列方框里的六个句子中选择五个还原到原文中，使原文意思完整、连贯。

2020年深圳市宝安区七下期末考试

2019-2020学年广东省深圳市宝安区七年级（下）期末数学试卷一、选择题：每小题3分，共36分，每小题有四个选项，其中只有一个是正确的，请把答案按要求填涂到答题卡相应位置上．1．（3分）计算（﹣1）0的结果为（）A．1 B．﹣1 C．0 D．±12．（3分）下面有4个汽车标志图案，其中是轴对称图形的有（）A．1个 B．2个 C．3个 D．4个3．（3分）环境监测中PM2.5是大气压中直径小于或等于0.0000025米的颗粒物，将数据0.0000025用科学记数法表示为（）A．0.25×10﹣5B．2.5×10﹣6C．2.5×10﹣5D．25×10﹣74．（3分）下列事件中，确定事件是（）A．﹣a一定是负数B．抛掷1个均匀的骰子，出现6点向上C．两条直线被第三条直线所截，同位角相等D．通常情况下，抛掷一石头，石头终将落地5．（3分）下列运算正确的是（）A．﹣5（a﹣1）=﹣5a+1 B．2a3÷a2=2a C．3a3•2a2=6a6D．（x﹣3）（x+2）=x2﹣66．（3分）如图，下列推理错误的是（）A．∵∠1=∠2，∴c∥d B．∵∠3=∠4，∴c∥d C．∵∠1=∠3，∴a∥b D．∵∠1=∠4，∴a∥b7．（3分）对任意整数n，按下列程序计算，该输出答案为（）A．n B．n2C．2n D．18．（3分）小明的父母出去散步，从家走了20分钟到一个离家900米的报亭，母亲随即按原速返回，父亲看了10分钟报纸后，用了15分钟返回家，下面的图形中表示父亲离家的时间（分钟）与距离（米）之间的关系是（）A．B．C．D．9．（3分）如图，用直尺和圆规作一个已知角的平分线，能得出∠MOC=∠NOC 的依据是（）A．SSS B．SAS C．ASA D．AAS10．（3分）如图所示，已知AB=DB，∠ABD=∠CBE，添加下列哪一个条件后，仍不能证明△ABC≌△DBE的是（）A．DE=AC B．∠BDE=∠BAC C．∠DEB=∠ACB D．BE=BC11．（3分）如图，在△ABC中，AB=AC，AB的垂直平分线DE交AC于点D，交AB于点E，已知AB=12，△DBC的周长为20，则底边BC的长是（）A．14 B．12 C．8 D．612．（3分）如图，将图1中阴影部分拼成图2，根据两个图形中阴影部分的关系，可以验证下列哪个计算公式（）A．（a+b）（a﹣b）=a2﹣b2B．（a﹣b）2=a2﹣2ab+b2C．（a+b）2=a2+2ab+b2D．（a+b）2=（a﹣b）2+4ab二、填空题：每小题3分，共12分，请把答案填到答案卷相应位置上．13．（3分）计算：3a（b﹣1）=．14．（3分）若把如图所示网格设计成一个投镖靶子，使得随意投掷一次飞镖击中红色区域的概率为，那么需要在网格中涂成红色的小正方形的个数为．15．（3分）如图，是用棋子摆成的图形，按照这种摆法，第n个图形中所需棋子的总数是用了．16．（3分）如图，AD是△ABC的角平分线，DE⊥AC，垂足是E，BF∥AC交ED=39，则EF=．的延长线于F点．若BC恰好平分∠ABF，且AB=13，S△ABD三、解答题：第17题10分，第18，19每题6分，第20，21每题8分，第22题5分，第23题9分，共52分．17．（10分）计算：（1）﹣23+（π﹣3）0+（）﹣1÷；（2）（﹣2x3）2•（2x）3+（﹣3x3）3．18．（6分）先化简，后求值：[（x+2y）（x﹣2y）+4（x﹣y）2]÷4x，其中x=，y=﹣1．19．（6分）甲袋里装有红球5个，白球2个和黑球12个，乙袋里装有红球20个，白球20个和黑球10个．（1）如果你取出1个黑球，选哪个袋子成功的机会大？请说明理由．（2）某同学说“从乙袋取出10个红球后，乙袋中的红球个数仍比甲袋中红球个数多，所以此时想取出1个红球，选乙袋成功的机会大．”你认为此说法正确吗？为什么？20．（8分）如图，P、A、B在一条直线上．（1）尺规作图，以P为顶点，以射线PB为一边，作∠QPB=∠CAB；（不写作法，保留作图痕迹）（2）若∠CAB=45°，判断AC与PQ的位置关系，并说明理由．21．（8分）小明、小亮从宝安中心图书馆出发，沿相同的线路跑向宝安体育场，小明先跑一点路程后，小亮开始出发，当小亮超过小明150米时，小亮停在此地等候小明，两人相遇后，一起以小明原来的速度跑向宝安体育场，如图，反映了两人所跑路程y（米）与所用时间x（秒）之间的关系，请根据题意解答下列问题：（1）问题中的自变量是，因变量是；（2）小明共跑了米，小明的速度为米/秒；（3）图中a=米，小亮在途中等候小明的时间是秒；（4）小亮从A跑到B这段的速度为米/秒．22．（5分）如图，四边形ABCD为一长方形纸片，AD∥BC，∠DAB=∠ABC=∠C=∠ADC=90°，E为BC上一点，将纸片沿AE折叠，B点落在长方形外的F点，连BD，若∠CBD=20°，且AF∥BD．求∠BAE的度数？解∵AD∥BC，∠CBD=20°（已知）∴∠ADB=∠CBD=20°（）∵AF∥BD（已知）∴∠ADB=（两直线平行，内错角相等）∵∠DAB=90°（已知）∴∠BAF=∠DAB+∠ADF=°∵纸片沿AE折叠∴∠BAE=∴∠BAE=∠BAF=．23．（9分）在△ABC中，AB=AC，点D是直线BC上一点（不与B、C重合），以AD为一边在AD的右侧作△ADE，使AD=AE，∠DAE=∠BAC，连接CE．（1）如图1，当点D在直线BC上，如果∠BAC=90°，求证：CE+DC=BC证明：∵∠BAC=∠DAE（已知）∴∠BAC﹣∠DAC=∠DAE﹣∠DAC即∠BAD=∠CAE在△ABD与△ACE中，∴△ABD≌△（）∴（全等三角形的对应法相等）∵BD+DC=BC∴CE+DC=BC．（2）如图1，在（1）条件下，求：∠BCE的度数？（3）如图2，当点D在线段BC上移动，设∠BAC=α，∠BCE=β，则α，β之间有怎样的数量关系？请说明理由．2019-2020学年广东省深圳市宝安区七年级（下）期末数学试卷参考答案与试题解析一、选择题：每小题3分，共36分，每小题有四个选项，其中只有一个是正确的，请把答案按要求填涂到答题卡相应位置上．1．（3分）计算（﹣1）0的结果为（）A．1 B．﹣1 C．0 D．±1【分析】根据非零的零次幂等于1，可得答案．【解答】解：（﹣1）0=1，故选：A．2．（3分）下面有4个汽车标志图案，其中是轴对称图形的有（）A．1个 B．2个 C．3个 D．4个【分析】根据轴对称图形的概念结合4个汽车标志图案的形状求解．【解答】解：由轴对称图形的概念可知第1个，第2个，第3个都是轴对称图形．第4个不是轴对称图形，是中心对称图形．故是轴对称图形的有3个．故选：C．3．（3分）环境监测中PM2.5是大气压中直径小于或等于0.0000025米的颗粒物，将数据0.0000025用科学记数法表示为（）A．0.25×10﹣5B．2.5×10﹣6C．2.5×10﹣5D．25×10﹣7【分析】绝对值小于1的正数也可以利用科学记数法表示，一般形式为a×10﹣n，与较大数的科学记数法不同的是其所使用的是负指数幂，指数由原数左边起第一个不为零的数字前面的0的个数所决定．【解答】解：将数据0.0000025用科学记数法表示为2.5×10﹣6，故选：B．4．（3分）下列事件中，确定事件是（）A．﹣a一定是负数B．抛掷1个均匀的骰子，出现6点向上C．两条直线被第三条直线所截，同位角相等D．通常情况下，抛掷一石头，石头终将落地【分析】根据事件发生的可能性大小判断相应事件的类型即可．【解答】解：A、﹣a是负数、零是随机事件，故A不符合题意；B、抛掷1个均匀的骰子，出现6点向上是随机事件，故B不符合题意；C、两条直线被第三条直线所截，同位角相等是随机事件，故C不符合题意；D、通常情况下，抛掷一石头，石头终将落地是必然事件，故D符合题意；故选：D．5．（3分）下列运算正确的是（）A．﹣5（a﹣1）=﹣5a+1 B．2a3÷a2=2a C．3a3•2a2=6a6D．（x﹣3）（x+2）=x2﹣6【分析】根据单项式乘以多项式、单项式除以单项式、多项式乘以多项式分别求出每个式子的值，再判断即可．【解答】解：A、结果是﹣5a+5，故本选项不符合题意；B、结果是2a，故本选项符合题意；C、结果是6a5，故本选项不符合题意；D、结果是x2﹣x﹣6，故本选项不符合题意；故选：B．6．（3分）如图，下列推理错误的是（）A．∵∠1=∠2，∴c∥d B．∵∠3=∠4，∴c∥d C．∵∠1=∠3，∴a∥b D．∵∠1=∠4，∴a∥b【分析】A、根据内错角相等，两直线平行进行判定；B根据同位角相等，两直线平行进行分析；C中∠1，∠3不是同位角，也不是内错角，因此不能判定直线平行；D根据内错角相等，两直线平行进行判定．【解答】解：A、∵∠1=∠2，∴c∥d，正确，不符合题意；B、∵∠3=∠4，∴c∥d，正确，不符合题意；C、∵∠1=∠3，∴a∥b，错误，符合题意；D、∵∠1=∠4，∴a∥b，正确，不符合题意；故选：C．7．（3分）对任意整数n，按下列程序计算，该输出答案为（）A．n B．n2C．2n D．1【分析】根据题中的程序框图列出关系式，化简即可得到结果．【解答】解：（n2+n）÷n﹣n=n+1﹣n=1．故选：D．8．（3分）小明的父母出去散步，从家走了20分钟到一个离家900米的报亭，母亲随即按原速返回，父亲看了10分钟报纸后，用了15分钟返回家，下面的图形中表示父亲离家的时间（分钟）与距离（米）之间的关系是（）A．B．C．D．【分析】根据函数图象的横坐标，可得时间，根据函数图象的纵坐标，可得离家的距离．【解答】解：20分钟到报亭离家的距离随时间的增加而增加，看报10分钟，离家的距离不变；15分钟回家离家的距离岁时间的增加而减少，故D符合题意．故选：D．9．（3分）如图，用直尺和圆规作一个已知角的平分线，能得出∠MOC=∠NOC 的依据是（）A．SSS B．SAS C．ASA D．AAS【分析】根据角平分线的作法可知MO=NO，CO=CO，MC=NC，符合三角形全等的判定方法中的SSS，可证△OMC≌△ONC，即证∠MOC=∠NOC．【解答】解：如图：由作法知在△COM和△CNO中，，∴△OMC≌△ONC（SSS），∴∠MOC=∠NOC．10．（3分）如图所示，已知AB=DB，∠ABD=∠CBE，添加下列哪一个条件后，仍不能证明△ABC≌△DBE的是（）A．DE=AC B．∠BDE=∠BAC C．∠DEB=∠ACB D．BE=BC【分析】利用∠ABD=∠CBE，加上∠ABC=∠DBE，则利用全等三角形的判定方法对各选项进行判断．【解答】解：∵∠ABD=∠CBE，∴∠ABC=∠DBE，∵AB=DB，∴BC=BE时，可利用“SAS”判定△ABC≌△DBE；当∠BDE=∠BAC时，可利用“ASA”判定△ABC≌△DBE；当∠DEB=∠ACB时，可利用“AAS”判定△ABC≌△DBE．故选：A．11．（3分）如图，在△ABC中，AB=AC，AB的垂直平分线DE交AC于点D，交AB于点E，已知AB=12，△DBC的周长为20，则底边BC的长是（）A．14 B．12 C．8 D．6【分析】由AB的中垂线DE交AC于点D，交AB于点E，可得AD=BD，又由AB=12，△DBC的周长为20，可求得BC的长．【解答】解：∵AB的中垂线DE交AC于点D，交AB于点E，∵△DBC的周长为20，∴BC+CD+BD=BC+CD+AD=BC+AC=20，∵AB=12，∴AC=12．∴BC=8，故选：C．12．（3分）如图，将图1中阴影部分拼成图2，根据两个图形中阴影部分的关系，可以验证下列哪个计算公式（）A．（a+b）（a﹣b）=a2﹣b2B．（a﹣b）2=a2﹣2ab+b2C．（a+b）2=a2+2ab+b2D．（a+b）2=（a﹣b）2+4ab【分析】根据图形确定出图1与图2的面积，即可作出判断．【解答】解：根据题意得：（a﹣b）2=a2﹣2ab+b2，故选：B．二、填空题：每小题3分，共12分，请把答案填到答案卷相应位置上．13．（3分）计算：3a（b﹣1）=ab﹣3a．【分析】单项式与多项式相乘的运算法则：单项式与多项式相乘，就是用单项式去乘多项式的每一项，再把所得的积相加．依此即可求解．【解答】解：3a（b﹣1）=ab﹣3a．故答案为：ab﹣3a．14．（3分）若把如图所示网格设计成一个投镖靶子，使得随意投掷一次飞镖击中红色区域的概率为，那么需要在网格中涂成红色的小正方形的个数为6．【分析】直接利用几何概率公式得出涂成红色的小正方形的个数．【解答】解：∵随意投掷一次飞镖击中红色区域的概率为，总数为16个正方形，∴在网格中涂成红色的小正方形的个数为：6．故答案为：6．15．（3分）如图，是用棋子摆成的图形，按照这种摆法，第n个图形中所需棋子的总数是用了n（n+1）个．【分析】观察每个图形中棋子的个数的规律即可发现有关棋子个数的通项公式，从而得到答案．【解答】解：第一个图形中有1×2=2个棋子，第二个图形中有2×3=6个棋子，第三个图形中有3×4=12个棋子，…故第n个图形中所需棋子的总数是用了n（n+1）个．故答案为：n（n+1）个．16．（3分）如图，AD是△ABC的角平分线，DE⊥AC，垂足是E，BF∥AC交ED=39，则EF=12．的延长线于F点．若BC恰好平分∠ABF，且AB=13，S△ABD【分析】过D作DG⊥AB于G，根据角平分线的性质得到DE=DG，根据平行线的性质得到∠F=90°，得到DF=DG，求得EF=2DG，根据三角形的面积得到DG=6，于是得到结论．【解答】解：过D作DG⊥AB于G，∵AD是△ABC的角平分线，DE⊥AC，∴DE=DG，∵BF∥AC，∴∠F+∠DEA=180°，∴∠F=90°，∴DF=DG，∴EF=2DG，∵AB=13，S=39，△ABD∴DG=6，∴EF=12，故答案为：12．三、解答题：第17题10分，第18，19每题6分，第20，21每题8分，第22题5分，第23题9分，共52分．17．（10分）计算：（1）﹣23+（π﹣3）0+（）﹣1÷；（2）（﹣2x3）2•（2x）3+（﹣3x3）3．【分析】（1）首先计算乘方、零次幂、负整数指数幂，然后再计算除法，最后计算加减即可；（2）首先计算乘方，然后再计算乘法，最后合并同类项即可．【解答】解：（1）原式=﹣8+1+2×4=﹣8+1+8=1；（2）原式=4x6•8x3﹣27x9=32x9﹣27x9=5x9．18．（6分）先化简，后求值：[（x+2y）（x﹣2y）+4（x﹣y）2]÷4x，其中x=，y=﹣1．【分析】根据整式的运算法则即可求出答案．【解答】解：当x=，y=﹣1时，∴原式=[x2﹣4y2+4（x2﹣2xy+y2）]÷4x=（x2﹣4y2+4x2﹣8xy+4y2）÷4x=（5x2﹣8xy）÷4x=x﹣2y=×﹣2×（﹣1）=2+2=419．（6分）甲袋里装有红球5个，白球2个和黑球12个，乙袋里装有红球20个，白球20个和黑球10个．（1）如果你取出1个黑球，选哪个袋子成功的机会大？请说明理由．（2）某同学说“从乙袋取出10个红球后，乙袋中的红球个数仍比甲袋中红球个数多，所以此时想取出1个红球，选乙袋成功的机会大．”你认为此说法正确吗？为什么？【分析】（1）利用小球个数，直接利用概率公式计算得出答案；（2）利用小球个数，直接利用概率公式计算得出答案．【解答】解：（1）∵甲袋里装有红球5个，白球2个和黑球12个，∴取出1个黑球的概率为：=；∵乙袋里装有红球20个，白球20个和黑球10个，∴取出1个黑球的概率为：=；∵＞，∴取出1个黑球，选甲袋子成功的机会大；（2）说法错误，理由：∵从乙袋取出10个红球后，乙袋中的红球个数为10，∴此时从乙袋中摸到红球的概率为：，从甲袋中摸到红球的概率为：，∴＞，∴选甲袋成功的机会大．20．（8分）如图，P、A、B在一条直线上．（1）尺规作图，以P为顶点，以射线PB为一边，作∠QPB=∠CAB；（不写作法，保留作图痕迹）（2）若∠CAB=45°，判断AC与PQ的位置关系，并说明理由．【分析】（1）根据作一个角等于已知角的方法作图即可；（2）图1，根据同位角相等两直线平行可得AC∥PQ；图2，根据三角形内角和为180°可推出AC⊥PQ．【解答】解：（1）如图所示：（2）图1，AC∥PQ，∵∠QPB=∠CAB，∴PQ∥AC；如图2，AC⊥PQ，延长CA交PQ于点M，∵∠QPB=∠CAB=45°∴∠PAM=45°，∴∠PMA=180°﹣45°﹣45°=90°，∴AC⊥PQ．21．（8分）小明、小亮从宝安中心图书馆出发，沿相同的线路跑向宝安体育场，小明先跑一点路程后，小亮开始出发，当小亮超过小明150米时，小亮停在此地等候小明，两人相遇后，一起以小明原来的速度跑向宝安体育场，如图，反映了两人所跑路程y（米）与所用时间x（秒）之间的关系，请根据题意解答下列问题：（1）问题中的自变量是所用时间x，因变量是两人所跑路程y；（2）小明共跑了900米，小明的速度为 1.5米/秒；（3）图中a=米，小亮在途中等候小明的时间是100秒；（4）小亮从A跑到B这段的速度为 2.5米/秒．【分析】（1）根据题意即可得到结论；（2）终点D的纵坐标就是路程，横坐标就是时间；（3）首先求得C点对用的横坐标，即a的值，则CD段的路程可以求得，时间是560﹣500=60秒，则小亮跑步的速度即可求得；B点时，所用的时间可以求得，然后求得路程是150米时，小明用的时间，就是小亮出发的时刻，两者的差就是所求；（4）根据题意即可得到结论．【解答】解：（1）问题中的自变量是所用时间x，因变量是两人所跑路程y；（2）根据图象可以得到：小明共跑了900米，用了600秒，则速度是：900÷600=1.5米/秒；（3）过B作BE⊥x轴于E．小明跑500秒的路程是a=500×1.5=750米，小明跑600米的时间是（750﹣150）÷1.5=400秒，小亮在途中等候甲的时间是500﹣400=100秒．（4）小亮跑步的速度是750÷（400﹣100）=2.5米/秒，答案为：所用时间x，两人所跑路程y，900，1.5，100，2.5．22．（5分）如图，四边形ABCD为一长方形纸片，AD∥BC，∠DAB=∠ABC=∠C=∠ADC=90°，E为BC上一点，将纸片沿AE折叠，B点落在长方形外的F点，连BD，若∠CBD=20°，且AF∥BD．求∠BAE的度数？解∵AD∥BC，∠CBD=20°（已知）∴∠ADB=∠CBD=20°（两直线平行，内错角相等）∵AF∥BD（已知）∴∠ADB=∠FAG（两直线平行，内错角相等）∵∠DAB=90°（已知）∴∠BAF=∠DAB+∠ADF=110°∵纸片沿AE折叠∴∠BAE=∠FAE∴∠BAE=∠BAF=55°．【分析】根据平行线的性质，即可得到∠FAG=20°，进而得到∠BAF的度数，再根据轴对称的性质，即可得到∠BAE=∠BAF=55°．【解答】解∵AD∥BC，∠CBD=20°，（已知）∴∠ADB=∠CBD=20°，（两直线平行，内错角相等）∵AF∥BD，（已知）∴∠ADB=∠FAG，（两直线平行，内错角相等）∵∠DAB=90°，（已知）∴∠BAF=∠DAB+∠ADF=110°，∵纸片沿AE折叠，∴∠BAE=∠FAE，∴∠BAE=∠BAF=55°．故答案为：两直线平行，内错角相等，∠FAG，110，∠FAE，55°．23．（9分）在△ABC中，AB=AC，点D是直线BC上一点（不与B、C重合），以AD为一边在AD的右侧作△ADE，使AD=AE，∠DAE=∠BAC，连接CE．（1）如图1，当点D在直线BC上，如果∠BAC=90°，求证：CE+DC=BC证明：∵∠BAC=∠DAE（已知）∴∠BAC﹣∠DAC=∠DAE﹣∠DAC即∠BAD=∠CAE在△ABD与△ACE中，∴△ABD≌△ACE（SAS）∴BD=CE（全等三角形的对应法相等）∵BD+DC=BC∴CE+DC=BC．（2）如图1，在（1）条件下，求：∠BCE的度数？（3）如图2，当点D在线段BC上移动，设∠BAC=α，∠BCE=β，则α，β之间有怎样的数量关系？请说明理由．【分析】（1）根据全等三角形的判定方法，补充条件即可解决问题；（2）由∠BAC=90°，AB=AC，推出∠B=45°，由△ABD≌△ACE，推出∠ACE=∠B=45°即可解决问题（3）由∠BAC=α，AB=AC，推出∠B=（180°﹣α）=90°﹣α．，由△ABD≌△ACE，推出∠ACE=∠B即可解决问题．【解答】解：（1）：∵∠BAC=∠DAE（已知）∴∠BAC﹣∠DAC=∠DAE﹣∠DAC即∠BAD=∠CAE在△ABD与△ACE中，，∴△ABD≌△ACE（SAS）∴BD=CE（全等三角形的对应法相等）∵BD+DC=BC∴CE+DC=BC．故答案为ACE，SAS，BD=CE．（2）∵∠BAC=90°，AB=AC，∴∠B=45°，∵△ABD≌△ACE，∴∠ACE=∠B=45°．∴∠BCE=90°．（3）∵∠BAC=α，AB=AC，∴∠B=（180°﹣α）=90°﹣α．，∵△ABD≌△ACE，∴∠ACE=∠B∴β=2（90°﹣α），即α+β=180°．。

广东省深圳市宝安中学初中部2019-2020学年七年级下学期期末数学试卷

2019-2020学年广东省深圳市宝安中学初中部七年级（下）期末数学试卷一、选择题（每题3分，共36分）1．计算（﹣）2的结果是（）A．﹣9B．9C．D．2．冠状病毒的一个变种是非典型肺炎的病原体，某种球形冠状病毒的直径是120纳米，1纳米＝10﹣9米，则这种冠状病毒的半径用科学记数法表示为（）A．1.2×10﹣7米B．1.2×10﹣11米C．0.6×10﹣11米D．6×10﹣8米3．两根长度分别为3cm、7cm的钢条，下面为第三根的长，则可组成一个三角形框架的是（）A．3cm B．4cm C．7cm D．10cm4．下列计算正确的是（）A．a2+a2＝a4B．（2a）3＝6a3C．a9÷a3＝a3D．（﹣2a）2•a3＝4a55．下列事件中，是不确定事件的是（）A．三条线段可以组成一个三角形B．内错角相等，两条直线平行C．对顶角相等D．平行于同一条直线的两条直线平行6．学习整式的乘法时，小明从图1边长为a的大正方形中剪掉一个边长为b的小正方形，将图1中阴影部分拼成图2的长方形，比较两个图中阴影部分的面积，能够验证的一个等式为（A．a（a+b）＝a2+ab B．（a+b）（a﹣b）＝a2﹣b2C．（a﹣b）2＝a2﹣2ab+b2D．a（a﹣b）＝a2﹣ab7．用直尺和圆规作一个角等于已知角的示意图如图，则说明∠A'O'B'＝∠AOB，两个三角形全等的依据是（）A．SAS B．ASA C．SSS D．不能确定8．如图，∠1+∠2＝180°，∠3＝100°，则∠4＝（）A．60°B．70°C．80°D．100°9．若等腰三角形的周长是18，一条边的长是5，则其他两边的长是（）A．5，8B．6.5，6.5C．5，8或6.5，6.5D．8，6.510．小刚从家出发徒步到同学家取自行车，在同学家逗留几分钟后骑车原路返回，设他从家出发后所用的时间为t分，离家的路程为s米，则s与t之间的关系大致可以用图象表示为（）A．B．C．D．11．如图，直线a∥b，点C，D分别在直线b，a上，AC⊥BC，CD平分∠ACB，若∠1＝65°，则∠2的度数为（）A．65°B．70°C．75°D．80°12．如图，在△ABC中，∠BAC＝90°，AD是高，BE是中线，CF是角平分线，CF交AD 于点G，交BE于点H，下面说法正确的是（）①△ABE的面积＝△BCE的面积；②∠AFG＝∠AGF；③∠F AG＝2∠ACF；④BH＝CH．A．①②③④B．①②③C．②④D．①③二、填空题（每题3分，共12分）13．已知a2+b2＝5，a+b＝2，则ab＝．14．从2，3，4，5，6，7，8，9中随机选出一个数，所选的数是2的倍数或3的倍数的概率为．15．如图，把一个长方形纸条ABCD沿EF折叠，若∠1＝54°，则∠FGE的度数为．16．如图，已知△ADC的面积为10，AD平分∠BAC，且AD⊥BD于点D，则△ABC的面积是．三、解答题（共52分）17．（10分）计算：（1）2﹣1﹣（）0+22020×（﹣0.5）2020；（2）2x2•3x4﹣（﹣2x3）2﹣x8÷x2．18．（6分）先化简，再求值：[（xy+2）（xy﹣2）﹣2（xy﹣1）2+6]÷（﹣2xy），其中x＝4，y＝﹣．19．（6分）在一个不透明的袋中装有2个黄球，3个黑球和5个红球，它们除颜色外其他都相同．（1）将袋中的球摇均匀后，求从袋中随机摸出一个球是黄球的概率；（2）现在再将若干个黄球放入袋中，与原来的10个球均匀混合在一起，使从袋中随机摸出一个球是黄球的概率是，请求出后来放入袋中的黄球的个数．20．（4分）你能用尺规作一个直角三角形，使其两条直角边分别等于已知线段a，b吗？21．（8分）深圳市地铁12号线断安段正在施工，现有甲乙两工程队共同承包断安段中A，B两地之间的道路，两队分别从A，B两地相向修建．已知甲队先施工3天，乙队才开始施工，乙队施工几天后因另有紧急任务暂停施工，因考虑工期，由甲队以原速的2倍修建，乙队完成紧急任务后又以原速恢复施工，直到道路修通．甲，乙两队各自修路长度与时间之间的关系如图所示，请结合图中信息解答下列问题：（1）试问：在施工的过程中，甲队在提速前每天修道路米；乙队每天修路米；（2）求乙队中途暂停施工的天数是天；（3）求A，B两地之间的道路长度．22．（8分）如图，点B、D在线段AE上，BC∥EF，AD＝BE，BC＝EF．求证：（1）∠C＝∠F；（2）AC∥DF．23．（10分）如图，在△ABC中，BD是中线，∠BAD＝∠BDA，DE∥AB交BC于点F，且AE平分∠BAD，连接AE，分别交BD，BC于点M，N．（1）若∠CDE＝70°，则∠E的度数是；（2）若DM＝DF，证明：AE＝BC；（3）在（2）的前提下，若DE平分∠BDC，判断BC与ED是否垂直，若垂直，请证明；若不垂直，请说明理由．2019-2020学年广东省深圳市宝安中学初中部七年级（下）期末数学试卷参考答案与试题解析一、选择题（每题3分，共36分）1．计算（﹣）2的结果是（）A．﹣9B．9C．D．【分析】根据乘方的意义计算即可．【解答】解：（﹣）2＝（﹣）×（﹣）＝．故选：C．2．冠状病毒的一个变种是非典型肺炎的病原体，某种球形冠状病毒的直径是120纳米，1纳米＝10﹣9米，则这种冠状病毒的半径用科学记数法表示为（）A．1.2×10﹣7米B．1.2×10﹣11米C．0.6×10﹣11米D．6×10﹣8米【分析】绝对值小于1的负数也可以利用科学记数法表示，一般形式为a×10﹣n，与较大数的科学记数法不同的是其所使用的是负整数指数幂，指数n由原数左边起第一个不为零的数字前面的0的个数所决定．【解答】解：120÷2（纳米）＝60×10﹣9米＝6×10﹣8米．故选：D．3．两根长度分别为3cm、7cm的钢条，下面为第三根的长，则可组成一个三角形框架的是（）A．3cm B．4cm C．7cm D．10cm【分析】已知两边，则第三边的长度应是大于两边的差而小于两边的和，这样就可求出第三边长的范围．【解答】解：依题意得：7﹣3＜x＜7+3，即4＜x＜10．故选：C．4．下列计算正确的是（）A．a2+a2＝a4B．（2a）3＝6a3C．a9÷a3＝a3D．（﹣2a）2•a3＝4a5【分析】根据单项式乘单项式的法则，合并同类项的法则，同底数幂的除法的法则，积的乘方和幂的乘方的法则计算即可．【解答】解：A、a2+a2＝2a2，不符合题意；B、（2a）3＝8a3，不符合题意；C、a9÷a3＝a6，不符合题意；D、（﹣2a）2•a3＝4a5，符合题意；故选：D．5．下列事件中，是不确定事件的是（）A．三条线段可以组成一个三角形B．内错角相等，两条直线平行C．对顶角相等D．平行于同一条直线的两条直线平行【分析】找到可能发生，也可能不发生的事件即可．【解答】解：A、三条线段可以组成一个三角形，属于随机事件，符合题意；B、内错角相等，两条直线平行，是一定发生的事件，属于必然事件，不符合题意；C、对顶角相等，属于必然事件，不符合题意；D、在平面内，平行于同一条直线的两条直线平行，属于必然事件，不符合题意；故选：A．6．学习整式的乘法时，小明从图1边长为a的大正方形中剪掉一个边长为b的小正方形，将图1中阴影部分拼成图2的长方形，比较两个图中阴影部分的面积，能够验证的一个等式为（A．a（a+b）＝a2+ab B．（a+b）（a﹣b）＝a2﹣b2C．（a﹣b）2＝a2﹣2ab+b2D．a（a﹣b）＝a2﹣ab【分析】分别根据面积公式进行计算，根据图1的面积＝图2的面积列式，即可得到平方差公式．【解答】解：图1阴影面积＝a2﹣b2，图2拼剪后的阴影面积＝（a+b）（a﹣b），∴得到的公式为：a2﹣b2＝（a+b）（a﹣b），即（a+b）（a﹣b）＝a2﹣b2，故选：B．7．用直尺和圆规作一个角等于已知角的示意图如图，则说明∠A'O'B'＝∠AOB，两个三角形全等的依据是（）A．SAS B．ASA C．SSS D．不能确定【分析】利用基本作法得到OD＝OC＝OD′＝OC′，CD＝C′D′，然后根据三角形全等的判定可对各选项进行判断．【解答】解：由作法得OD＝OC＝OD′＝OC′，CD＝C′D′，∴△OCD≌△O′C′D′（SSS），∴∠A'O'B'＝∠AOB．故选：C．8．如图，∠1+∠2＝180°，∠3＝100°，则∠4＝（）A．60°B．70°C．80°D．100°【分析】由∠1+∠2＝180°及邻补角互补，可得出∠2＝∠5，利用“同位角相等，两直线平行”可得出a∥b，利用“两直线平行，同位角相等”可得出∠6的度数，再利用邻补角互补可求出∠4的度数．【解答】解：∵∠1+∠2＝180°，∠1+∠5＝180°，∴∠2＝∠5，∴a∥b，∴∠6＝∠3＝100°．又∵∠4+∠6＝180°，∴∠4＝180°﹣∠6＝80°．故选：C．9．若等腰三角形的周长是18，一条边的长是5，则其他两边的长是（）A．5，8B．6.5，6.5C．5，8或6.5，6.5D．8，6.5【分析】由等腰三角形的周长为18，三角形的一边长5，分别以5是底边长与5为腰长去分析求解即可求得答案．【解答】解：若底边长为，设腰长为x，则x+x+5＝18，解得：x＝，若腰长为，5，设底边为y，则y+5+5＝18，解得：y＝8，所以这个等腰三角形的另外两边长为，或5，8，故选：C．10．小刚从家出发徒步到同学家取自行车，在同学家逗留几分钟后骑车原路返回，设他从家出发后所用的时间为t分，离家的路程为s米，则s与t之间的关系大致可以用图象表示为（）A．B．C．D．【分析】根据题意，把小刚的运动过程分为三个阶段，分别分析出s、t之间的变化关系，从而得解．【解答】解：小刚取车的整个过程共分三个阶段：①徒步从家到同学家，s随时间t的增大而增大；②在同学家逗留期间，s不变；③骑车返回途中，速度是徒步速度的3倍，比徒步时的直线更陡，离家距离为0；纵观各选项，只有A选项符合．故选：A．11．如图，直线a∥b，点C，D分别在直线b，a上，AC⊥BC，CD平分∠ACB，若∠1＝65°，则∠2的度数为（）A．65°B．70°C．75°D．80°【分析】由AC⊥BC，CD平分∠ACB知∠BCD＝45°，结合∠1＝65°知∠2＝∠3＝180°﹣∠1﹣∠BCD，据此可得答案．【解答】解：如图，∵AC⊥BC，∴∠ACB＝90°，∵CD平分∠ACB，∴∠BCD＝∠ACB＝45°，∵∠1＝65°，∴∠2＝∠3＝180°﹣∠1﹣∠BCD＝70°，故选：B．12．如图，在△ABC中，∠BAC＝90°，AD是高，BE是中线，CF是角平分线，CF交AD 于点G，交BE于点H，下面说法正确的是（）①△ABE的面积＝△BCE的面积；②∠AFG＝∠AGF；③∠F AG＝2∠ACF；④BH＝CH．A．①②③④B．①②③C．②④D．①③【分析】根据等底等高的三角形的面积相等即可判断①；根据三角形内角和定理求出∠ABC＝∠CAD，根据三角形的外角性质即可推出②；根据三角形内角和定理求出∠F AG ＝∠ACD，根据角平分线定义即可判断③；根据等腰三角形的判定判断④即可．【解答】解：∵BE是中线，∴AE＝CE，∴△ABE的面积＝△BCE的面积（等底等高的三角形的面积相等），故①正确；∵CF是角平分线，∴∠ACF＝∠BCF，∵AD为高，∴∠ADC＝90°，∵∠BAC＝90°，∴∠ABC+∠ACB＝90°，∠ACB+∠CAD＝90°，∴∠ABC＝∠CAD，∵∠AFG＝∠ABC+∠BCF，∠AGF＝∠CAD+∠ACF，∴∠AFG＝∠AGF，故②正确；∵AD为高，∴∠ADB＝90°，∵∠BAC＝90°，∴∠ABC+∠ACB＝90°，∠ABC+∠BAD＝90°，∴∠ACB＝∠BAD，∵CF是∠ACB的平分线，∴∠ACB＝2∠ACF，∴∠BAD＝2∠ACF，即∠F AG＝2∠ACF，故③正确；根据已知条件不能推出∠HBC＝∠HCB，即不能推出BH＝CH，故④错误；故选：B．二、填空题（每题3分，共12分）13．已知a2+b2＝5，a+b＝2，则ab＝．【分析】两数和的完全平方公式：（a+b）²＝a²+2ab+b²，把a2+b2＝5，a+b＝2代入，即可求得ab值．【解答】解：∵a2+b2＝5，a+b＝2，又∵（a+b）²＝a²+2ab+b²，即（a+b）²＝a²+2ab+b²＝（a²+b²）+2ab，∴2²＝5+2ab，2ab＝﹣1，ab＝﹣，故答案是：﹣．14．从2，3，4，5，6，7，8，9中随机选出一个数，所选的数是2的倍数或3的倍数的概率为．【分析】由从2，3，4，5，6，7，8，9这8个数中随机的取出一个数，所取出的数是2的倍数或是3的倍数的有6个，利用概率公式求解即可求得答案．【解答】解：∵从2，3，4，5，6，7，8，9这8个数中随机的取出一个数，所取出的数是2的倍数或是3的倍数的有6个，∴所取出的数是2的倍数或3的倍数的概率是：＝．故答案为：．15．如图，把一个长方形纸条ABCD沿EF折叠，若∠1＝54°，则∠FGE的度数为72°．【分析】由平行线的性质得∠DEF＝∠1＝54°，由折叠的性质得∠GEF＝∠DEF＝54°，再由平角定义求出∠AEG，即可求得∠FGE．【解答】解：∵四边形ABCD是长方形，∴AD∥BC，∴∠DEF＝∠1＝54°，∠FGE＝∠AEG，由折叠的性质得：∠GEF＝∠DEF＝54°，∴∠AEG＝180°﹣54°×2＝72°，∴∠FGE＝72°，故答案为：72°．16．如图，已知△ADC的面积为10，AD平分∠BAC，且AD⊥BD于点D，则△ABC的面积是20．【分析】延长BD交AC于点E，则可知△ABE为等腰三角形，则S△ABD＝S△ADE，S△BDC ＝S△CDE，可得出S△ABC＝2S△ADC．【解答】解：如图，延长BD交AC于点E，∵AD平分∠BAC，AD⊥BD，∴∠BAD＝∠EAD，∠ADB＝∠ADE＝90°，在△ABD和△AED中，，∴△ABD≌△AED（ASA），∴BD＝DE，∴S△ABD＝S△ADE，S△BDC＝S△CDE，∴S△ABD+S△BDC＝S△ADE+S△CDE＝S△ADC，∴S△ABC═2S△ADC，∵S△ADC＝10，∴S△ABC═20，故答案为：20．三、解答题（共52分）17．（10分）计算：（1）2﹣1﹣（）0+22020×（﹣0.5）2020；（2）2x2•3x4﹣（﹣2x3）2﹣x8÷x2．【分析】（1）根据负整数指数幂、零指数幂、逆用积的乘方的性质、有理数的加减法则计算即可；（2）先根据积的乘方和幂的乘方法则计算，再根据单项式乘单项式、合并同类项的运算法则计算．【解答】解：（1）原式＝＝＝．（2）原式＝6x6﹣4x6﹣x6＝x6．18．（6分）先化简，再求值：[（xy+2）（xy﹣2）﹣2（xy﹣1）2+6]÷（﹣2xy），其中x＝4，y＝﹣．【分析】根据平方差公式，完全平方公式将括号内整式进行乘法运算后合并同类项，再利用整式除法法则化简，再把x，y值代入计算可求解．【解答】解：原式＝（x2y2﹣4﹣2x2y2+4xy﹣2+6）÷（﹣2xy）＝（﹣x2y2+4xy）÷（﹣2xy）＝，当时，原式＝＝﹣1﹣2＝﹣3．19．（6分）在一个不透明的袋中装有2个黄球，3个黑球和5个红球，它们除颜色外其他都相同．（1）将袋中的球摇均匀后，求从袋中随机摸出一个球是黄球的概率；（2）现在再将若干个黄球放入袋中，与原来的10个球均匀混合在一起，使从袋中随机摸出一个球是黄球的概率是，请求出后来放入袋中的黄球的个数．【分析】（1）求出黄球占总数的几分之几即可；（2）根据概率的意义列方程求解即可．【解答】解：（1）摸到黄球的概率为＝，答：摸到黄球的概率为；（2）设再放入黄球x个，由题意得，＝，解得x＝2，经检验x＝2是原方程的解，答：再放入2个黄球．20．（4分）你能用尺规作一个直角三角形，使其两条直角边分别等于已知线段a，b吗？【分析】用尺规作一个直角三角形，使其两条直角边分别等于已知线段a，b即可．【解答】解：如图，三角形ABC即为所求．21．（8分）深圳市地铁12号线断安段正在施工，现有甲乙两工程队共同承包断安段中A，B两地之间的道路，两队分别从A，B两地相向修建．已知甲队先施工3天，乙队才开始施工，乙队施工几天后因另有紧急任务暂停施工，因考虑工期，由甲队以原速的2倍修建，乙队完成紧急任务后又以原速恢复施工，直到道路修通．甲，乙两队各自修路长度与时间之间的关系如图所示，请结合图中信息解答下列问题：（1）试问：在施工的过程中，甲队在提速前每天修道路88米；乙队每天修路220米；（2）求乙队中途暂停施工的天数是3天；（3）求A，B两地之间的道路长度．【分析】（1）根据图象得出甲队在提速前每天修路的米数和乙队每天修路的米数即可；（2）根据图象得出乙队完成紧急任务后又以原速恢复施工的天数，进而解答即可；（3）根据甲的速度由速度与路程的关系解答即可．【解答】解：（1）根据题意，甲队在提速前每天修路440÷5＝88（米），乙队每天修路440÷（5﹣3）＝220（米），故答案为：88，220；（2）根据题意，乙队共修路1100米，乙队完成紧急任务后又以原速恢复施工的天数：[1100﹣220×（6﹣3）]÷220＝2（天），∴乙队中途暂停施工的天数为11﹣6﹣2＝3（天），故答案为：3；（3）由（1）知，甲队提速前的施工速度为88米/天，则提速后甲队是速度为88×2＝176（米/天），AB两地之间长度为：88×6+176×（11﹣6）+1100＝2508（米），答：AB两地之间的道路长度为2508米．22．（8分）如图，点B、D在线段AE上，BC∥EF，AD＝BE，BC＝EF．求证：（1）∠C＝∠F；（2）AC∥DF．【分析】（1）根据等式的性质得出AB＝DE，再有BC∥EF就用∠DBC＝∠BEF，证明△ABC≌△DEF就可以得出结论；（2）由△ABC≌△DEF可以得出∠CAB＝∠FDE，就可以得出结论．【解答】证明：（1）∵BC∥EF（已知）∴∠ABC＝∠DEF∵AD＝BE∴AD+DB＝DB+BE即AB＝DE在△ABC与△DEF中，∴△ABC≌△DEF∴∠C＝∠F；（2）∵△ABC≌△DEF，∴∠A＝∠FDE，∴AC∥DF．23．（10分）如图，在△ABC中，BD是中线，∠BAD＝∠BDA，DE∥AB交BC于点F，且AE平分∠BAD，连接AE，分别交BD，BC于点M，N．（1）若∠CDE＝70°，则∠E的度数是35°；（2）若DM＝DF，证明：AE＝BC；（3）在（2）的前提下，若DE平分∠BDC，判断BC与ED是否垂直，若垂直，请证明；若不垂直，请说明理由．【分析】（1）由DE∥AB，∠CDE＝70°，得∠BAD＝∠CDE＝70°，根据AE平分∠BAD，即可得∠E＝∠BAE＝35°；（2）证明△ADM≌△CDF（SAS），得∠DAM＝∠C，由∠FDC＝∠BDA，得∠BDC＝∠ADE，从而可证△BDC≌△EDA（ASA），即得AE＝BC；（3）由DE平分∠BDC，可得∠BDE＝∠CDE＝∠BDA＝60°，而∠BAD＝∠BDA，故∠BAD＝60°，根据AE平分∠BAD，得∠DAM＝30°，∠AMD＝90°＝∠BMN，再在△BMN和△EFN中，由“8字形”即得BC⊥ED．【解答】解：（1）∵DE∥AB，∠CDE＝70°，∴∠BAD＝∠CDE＝70°，∵AE平分∠BAD，∴∠BAE＝∠BAD＝35°，∴∠E＝∠BAE＝35°，故答案为：35°；（2）∵BD是△ABC的中线，∴AD＝CD，∵DE∥AB，∴∠FDC＝∠BAD，∵∠BAD＝∠BDA，∴∠FDC＝∠BDA，在△ADM和△CDF中，，∴△ADM≌△CDF（SAS），∴∠DAM＝∠C，∵∠FDC＝∠BDA，∴∠BDC＝∠ADE，在△BDC和△EDA中，，∴△BDC≌△EDA（ASA），∴AE＝BC；（3）BC⊥ED，证明如下：∵DE平分∠BDC，∴∠BDE＝∠CDE，∵∠CDE＝∠BDA，∴∠BDE＝∠CDE＝∠BDA＝60°，∵∠BAD＝∠BDA，∴∠BAD＝60°，∵AE平分∠BAD，∴∠DAM＝30°，∴∠AMD＝90°＝∠BMN，由（2）知：∠AED＝∠DBC，且∠BNM＝∠ENF，∴∠EFN＝∠BMN＝90°，∴BC⊥ED．。

广东省深圳宝安中学2019-2020年下学期七年级英语第一次阶段测试(word版含答案,无听力)

广东省深圳宝安中学2019-2020年下学期七年级英语第一次阶段性检测（word版含答案，无听力）考试时间：75min考试内容：第一部分听力部分无(25分)第二部分笔试部分(75分)I.词汇测试。

(20分)从下面每小题的A、B、C三个选项中选出最佳选项。

(共20小题，每小题1分)() 1. — Johnson, let’s finish our English homework together.—OK. Let’s do it in my home.A. readB. followC. complete() 2. — What do you think of your new classmate Lily?—Really excellent.All the teachers and students like her very much.A. goodB. badC.natural() 3. — I will go to Hangzhou for holiday.—That’s a good place. It is famous for West Lake.A. known forB. good forC. interested in() 4. — I don’t want to do the work. It’s hard for me.—Don’t give up doing it. Work hard and you will finish it successfully. A. like B. stop C.enjoy() 5. — Would you like to go climbing with me tomorrow morning?—I’d like to, but I have to take care of my sick pet dog.A. worry aboutB. take part inC. look after() 6. A(n) __________ is a large shop. You can buy different things there.A. storeB. officeC. hall() 7. — Tom likes to __________ others when they are in trouble.—That’s not right. He should help them.A. make fun ofB.make friends withC. be helpful to() 8. —When I am in trouble, my parents are always with me and give me lots of __________.—Yes, they love you very much.A. hobbiesB.supportC.practice() 9. — Where did you __________ last week?—I went to France with my father. It is really a great place to visit.A. go to workB.have a restC. go on holiday() 10. — Why was the teacher angry with you this morning?—Because I __________ to bring my homework to school again.A. rememberedB. forgotC. wanted() 11. He ________ to answer my question.A. repliedB. refusedC. asked() 12. I also _________ for the Poem Competition this year.A. enteredB. wonC. joined() 13. The soldiers keep _________ at the gate from day to night.A. orderB. paceC.guard() 14. Please call me __________. There is an urgent message I need to send to you right now.A. repeatedlyB. immediatelyC.recently() 15. He will teach me English, and I’ll teach him Chinese __________.A. in returnB. anymoreC. thanks to() 16. The guest slept in the__________ room we do not use.A. singleB. emptyC. spare() 17. This is a __________ garden that i snot open for the public.A. valuableB. privateC.distant() 18. As usual, the police will have a difficult time. They will be trying to keep __________.A. experienceB. occasionC.order() 19. You __________ the prize as you did a good job.A. requestB.deserveC. allow() 20. The big clock __________ twice a day.A. ringsB. bellsC. strikesII.完形填空。

2019-2020学年深圳宝安新安中学初中部高三英语下学期期末考试试卷及答案

2019-2020学年深圳宝安新安中学初中部高三英语下学期期末考试试卷及答案第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项AI truly thought thatI might die that day. Had I not seen three bears and a few wolves over the last couple of days near the road, I might have just lain down and called it quits. What in the world was I thinking, dragging my bike up to Yellowstone and thinking I could ride from West Yellowstone to Old Faithful in the snow? No less!I had planned this trip for more than two months, and I wasn't about to give up so easily. The first few miles were beautiful. Ten miles in, I started sucking wind. Fifteen miles and my legs felt like they were made of lead. By twenty miles, my lungs were burning and felt like there was nothing left in the tank. That was when I turned around and saw my husband and three children cheering me on in the van behind me. I knew I couldn't quit because I tell my children all the time that just because something is hard doesn't mean that you stop doing it. I had to live what I'd been preaching(说教). That thought got me up that mountain and to the end of the ride.The importance of that ride was apparent after only a week. My eight-year-old daughter Emalee wanted to ride in a twelve-mile charity ride. That day was cold as well. She was the youngest rider. About four miles into the ride, she started feeling cold. The chill(寒冷)was making her muscles cramp a little and she began to struggle. By six miles, she had tears running down her face. It broke my heart to see her suffering like that.I told herthat she didn't have to finish. She said that she wouldn't quit. I told her how I had wanted to quit the week before, but perseverance had gotten me to the end and I knew she could do it, too.The look on her face as she pulled into the finish was priceless. She threw her arms around me and said, “You didn't quit, Mommy, so neither did I.”1. What motivated the author to finish her ride?A. Her family's encouragement.B. Her own instruction for children.C. The beautiful scenery and weather.D. The careful and thorough preparation.2. By describing the conditions Emalee met, the author wanted to________.A. show her guilt for her daughterB. prove that riding is a tough taskC. persuade her daughter to give upD. indicate she was proud of Emalee3. What does the author want to tell us according to the story?A. Never say die.B. Do nothing by halves.C. Children are what the mothers are.D. Every mother's child is handsome.BA 24-year-old female space commander has become a viral sensation on Chinese social media for her work.Zhou Chengyu was in charge of the rocket connector system---described as a vital role. Her story in particular has drawn the public’s attention given her young age. Social media users have been celebrating her brilliance and referring to her as pride of the country.Being the youngest of the team, Zhou Chengyu was born in1996 intheprovinceofGuizhou. She is certainly not “old” enough compared with her colleagues, but she is known at work as "Big Sister” as a sign of respect. Once in a 3-km running contest, she actually beat half of her male counterparts. Although work shifts are not uncommon at the Wenchang Spacecraft Launch Site, each shift requires tremendous courage because of the different background knowledge. However, for Zhou Chengyu, she experienced multiple positions in 5 launching tests and now she is the youngest commander at the site.Despite carefulness and high responsibility at work, she is just like her peers in normal life. Eating snacks and shopping are her favorite free-time activities. Her high school teacher remembers her as tough and determined. “She always had a dream of becoming scientist,” said her physics teacher.According to her colleague, Zhou Chengyu was very surprised when she found out shewent viralonline. She said that she was happy when she saw people online regarding her as the pride of the country, and yet she kept saying that she was “nobody but normal worker at a launch site” and there are a lot more people just like her going unnoticed while doing the hardest job to guarantee a better future for the Chinese space program. She also said that she wished to remain her current status and continue doing her work with or without the popularity.4. What makes Zhou Chengyu the pride of the country?A. Her young age.B. Her vital role in her work.C. Her great courage.D. Her responsibility at work.5. Which of the following words can best describe Zhou Chengyu?A. Learned and confident.B. Respectable and generous.C. Patient and responsible.D. Modest and determined.6. Which of the following can replace the underlined words in paragraph 5?A. took prideB. made a contributionC. became a hitD. made an achievement7. What can be the best title for the text?A. A Young PrideB. A Successful ColleagueC. An Extraordinary DreamD. An Ambitious CommanderCBrain cells work to actively forget memories during a specific period of sleep. When we sleep our brains clear out the memories we’ve made while we’re awake, deciding what to keep and what to get rid of. Forgetting is an active process, explained the authors of the study published in the journal Science. But less is known about this process during the different periods of sleep.They found that during the rapid eye movement (REM ) sleep period — or active sleep when we are thought to dream — special nerve cells appear to actively contribute to forgetting. What are known as melanin-concentrating hormone-producing (MCH) neurons (神经元) sit in the hypothalamus (下丘脑): a part of the brain which helps with a range of functions such as sleep, appetite and emotions. Past research has suggested these cells help to control REM sleep patterns: activating the MCH neurons increasing time spentin this period, while preventingthemreducing changes into this period.The scientists looked at MCH cells in mice, and found 52.8 percent were active during REM sleep, compared with 35 percent when the mice were awake. Study co-author Thomas Kilduff, director of the Center for Neuroscience at SRI International, told Newsweek the team was surprised to find that mice performed better on learning and memory tasks when the MCH cells were prevented. “This result suggests that activation of the MCH neurons may affect memory — that is, MCH neurons may facilitate forgetting,” Kilduff explained.When asked what motivated the study, Kilduff said, “We hope the work could deepen our understanding of Alzheimer’s disease. Understanding the neural basis of learning and memory is a huge area of neuroscience research because of its effects on our everyday lives, as well as diseases such as Alzheimer’s disease. Prior to this work, no one suspected that MCH neurons had anything to do with forgetting,” said Kilduff.8. What can we infer from paragraph 1?A. Forgetting is a passive process.B. The forgetting process is known to us.C. Some memories are forgotten while we are awake.D. Certain memories are removed while we are asleep.9. What does the underlined word “them” in paragraph 2 refer to?A. REM sleep patterns.B. Past researches.C. MCH neurons.D. A range of functions.10. Why did Kilduff’s team conduct the research?A. To publish the study in the journal Science.B. To know more about Alzheimer’s disease.C. To contribute to human’s forgetting.D. To explore our everyday lives.11. What can we know about MCH?A. MCH cells takes control of REM sleep patterns .B. MCH neurons may disturb memory consolidation.C. MCH neurons have nothing to do with forgetting.D. MCH cells help mice performing better on learning.DDistinguished Baltimore artist John D. Ferguson died Sept 16. The Catonsville resident was 81.“His artist eye was in everything he did. His life was art and his family,” said Jennifer C. Jackson, who was Mr. Ferguson's friend for nearly three decades.” He was a lovable man who was always willing to talk about any topic he was interested in. At shows, people would go crazy for his work,” Ms. Jackson said. “He was also an enthusiastic sailor who loved nothing more than being on the water.” “His sculptures were just memorable,” said Mr. Lund, a Washingtonian. “I used to say, ‘Ferguson, I don't think you know how to do anything that is less than monumental.’”Mr. Ferguson earned a bachelor's degree in 1961 at Holy Cross University, where he developed an interest in painting. He served in the Army for two years until being discharged in 1963, and after studying briefly at the Boston Museum School, registered at the Chicago Art Institute, where he studied until 1966, when he entered theUniversity of Illinois Chicago, where he obtained a bachelor's degree in 1966 in fine arts. Mr. Ferguson developed his interest and skills as a sculptor after moving to Baltimore to do further studies at the Maryland Institute College of Art's Rinehart School of Sculpture, from which he graduated in 1971 with a master's degree in fine arts.“Over the years my work has moved gradually in the direction of elegance and simplicity,” Mr. Ferguson wrote in his artist statement. “Heavy, bulbous forms have been replaced by dancing, winglike forms. The welding process and respect for the qualities of the materials are interrelated and affect the final piece. “Most of the sculptures that are pictured in my works are made from steel, silicon bronze, and to Cor-Ten steel; shaped to create these beautiful and unique pieces of art. As you can see, my sculptures range in size anywhere from 12 inches to 30 feet or larger.”Through the years, his work found its way into such major public and private collections. “They encourage optimism, for they show strength and affirmation; there's nothing negative, depressing or anxiety-ridden about them”, wrote the late art critic John Dorsey in a 1997 exhibition review.12. What did Mr. Lund think of Ferguson?A. Likeable.B. Ordinary.C. Unwelcome.D. Interesting.13. What did Mr. Ferguson do first after serving in the army?A. He studied at the Boston Museum School.B. He got a bachelor's degree in fine arts.C. He entered the University of Illinois Chicago.D. He continued his studies at the Maryland Institute College.14. What influences the final sculptures?A. An even larger scale than before.B. The material comprised of metalsC. The shape of elegance and simplicity.D. Welding process as well as material quality.15. Which of the following is a suitable title for the text?A. A stylish, stubborn old manB. Sculptures towering into the cloudsC. JohnD. Ferguson—a famous sculpturer D. The evolution of the sculptural style第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。

2019-2020学年深圳宝安新安中学初中部高三英语期末考试试卷及答案

2019-2020学年深圳宝安新安中学初中部高三英语期末考试试卷及答案第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项AStudents, teachers, and local community members are strongly encouraged to register online to receive real-time information of emergency events fromColumbiaUniversity.Text message warnings will only be used in rare cases where ongoing events causean immediate threat or have a significant influence. Possible situations include severe weather conditions, emergency campus closures, crimes in progress that may endanger the community, and major transportation interruptions.Read instructions on how to sign up for emergency notifications（通知）.ColumbiastudentsColumbiastudents can easily register for text message notifications. Simply enter Student Services Online, click on "Text Message Enrollment" and add your cellphone number. Students can register parents or family members by following the instructions for the public below.ColumbiateachersColumbiateachers can register for text message notifications by following the step by step instructions below:● Register with your UNI and password .● Select "Faculty & Staff"at the top of the page.● Select "Contact Details".● Click the "+" under "Phone".● Select "Campus Alert 1".● Enter your mobile number.To receive emergency information on additional mobile phones, you may follow the above instructions for "Campus Alert2" and "Campus Alert 3" for a total of three.Community/General PublicCommunity/General Public interested in receiving emergency information fromColumbiacan sign up by clicking on the "Register" button on the registration page and entering their email and mobile number. Users will receive confirmation code（密码）on their phone and will need to confirm their account via email.Users can choose not to use the Emergency Text Alert System at any time by texting STOP to 226787, calling 226789 or sending an email tolr27682@.1.Which is a possiblesituation where a text message will be sent?A.The temperature will drop slightly tomorrow.B.The campus will be closed during Christmas.C.The main railway system of the city is interrupted.D.A bank robber is being sentenced in the court of the city.2.Which step comes before the others when teachers register?A.Selecting Campus Alert.B.Entering mobile numbers.C.Clicking "+" under "Phone".D.Selecting "Faculty& Staff".3.How can users stop receiving text messages?A.By sending an email.B.By texting STOP to 226789.C.By managing information online.D.By making a phone call to 226787.BYou run into the grocery store to quickly pick up your item. You grab what you need and head to the front of the store. After quickly sizing up the check-out lines, you choose the one that looks fastest. You chose wrong. People getting in other lines long after you have already checked out and headed to the parking lot. Why does this seem to always happen to you?Well, as it turns out, it's just math that is working against you. A grocery store tries to have enough employees at the checkout lines to get all their customers through with minimum delay. But sometimes, like on a Sunday afternoon, they get super busy. Because most grocery stores don't have the physical space to add more checkout lines, their system becomes overburdened. Some small interruption — a price check, a particularly talkative customer — will have downstream effects, holding up the entire line behind them.If there are three lines at the store, these delays will happen randomly at different registers (收银台). Think about the probability. The chances of your line being that fastest one are only one in three, which means you have a two-thirds chance of not being in the fastest line. So it's not just in your mind: Another line is probably moving faster thanyours.Now, mathematicians have come up with a good solution, which they call queuing theory, to this problem:Just make all customers stand in one long snaking line, called a serpentine line, and serve each person at the front with the next available register. With three registers, this method is about three times faster on average than the more traditional approach. This is what they do at most banks, Trader Joe's, and some fast-food places. With a serpentine line, a long delay at one register won't unfairly punish the people who lined up behind it. Instead, it will slow everyone down a little bit.4. What phenomenon is described in the first paragraph?A. Queuing in a line.B. A shopping experience.C. A rush in the morning.D. Cutting in a line.5. According to the article, what may cause delays in checking out?A. The lack of employees in the grocery store.B. Some unexpected delays of certain customers.C. The increasing items bought by customers.D. A worsening shopping system of the store.6. What is the solution given by mathematicians?A. Employing more workers for checking out.B. Limiting the number of queuing people.C. Making only one line available.D. Always standing in the same line.7. What's the principle behind the queuing theory?A. To pursue the maximum benefit.B. To leave success or failure to luck.C. To avoid the minimum loss.D. To spread the risk equally among everyone.CPlanned missions to the moon need to hurry up to avoid hitting one of the busiest periods for extreme space weather, according to scientists conducting the most in-depth ever research on solar storm timing.Scientists at theUniversityofReadingstudied 150 years of space weather data to look into patterns in the timing of the most extreme events,which can be extremely dangerous to astronauts and satellites. This new research on space weather timing allows predictions to be made for extreme space weather. Therefore, it could be used to plan the timing of activities, which could be affected by extreme space weather, for example, major spacemissions.The researchers found for the first time that extreme space weather events are more likely to occur early in or late solar cycles-such as the one just starting. The findings may have influences on the NASA-led Artemis mission. It plans to make humans return to the moon in 2024, but can be put off to the late 2020s.Professor Mathew Owens, a space physicist at theUniversityofReading, said, “Until now, the most extreme space weather events were thought to berandomin their timing. Though there is no set pattern of the events, this research suggests they are more predictable.”In the new study, the scientists used a new method applying statistical modelling to storm timing for the first time. Previous research generally focused on how big extreme space weather events can be, based on observations of previous events. Predicting their timing is far more difficult because extreme events are rare, so there is ly little historic data to identify patterns. The findings suggest that any major planned space missions , which is beyond the next five years, will have to consider the higher probability of extreme space weather late in the present solar cycle between 2026 and 2030.8. What can we learn about the study from the first two paragraphs?A. It has lasted just 150 years.B. It doesn't refer to space weather data.C. It shows space weather has no effect on astronauts.D. It makes it possible to predict extreme space weather.9. Why might the NASA-led Artemis mission be put off?A. To research solar cycles.B. To avoid effects of space weather.C. To meet the needs of the astronauts.D. To make humans return to Earth in 2024.10. What does the underlined word “random“ in paragraph 4 probably mean?A. Irregular.B. Easy.C. Limited.D. Changeless.11. What can we infer from the last paragraph?A. The study is useful for future space missions.B. The planned space missions should be put off.C. Extreme space weather will happen before 2026.D. Previous observations make no difference to the study.DWhen I was a kid, my mom set aside some breakfast food for supper every nowand then. I remember one night after a long, hard day at work, my mom placed a plate of eggs, sausage, and a plate of extremely burnt biscuits on the table. I waited to see if my dad would get annoyed.All my dad did was to reach for the biscuits, smile at my mom and ask me how my day at school had been. I don't remember what I told him that night but I do remember watching him add butter and jelly on that ugly burnt biscuit and ate every bite of that thing. He never made a face nor uttered a word about it!When I rose from the table that evening, I remember hearing my mom apologize to my dad for overcooking the biscuits and I will never forget what he said, “Honey, I love burnt biscuits every now and then."Later that night, I went to say good night to my daddy, and I wondered if he really liked his biscuits burnt. He wrapped me up in his arms and said gently, "Your mom put in a hard day at work today and she is really tired. Besides, a little burnt biscuit never hurt anyone!As I have grown older, I've thought about that many times. Life is full of imperfect things and imperfect people. Learning to accept each other's faults and choosing to celebrate each other's differences contribute to a healthy, growing, and lasting relationship. We could extend this philosophy to any relationship, such as a husband-wife, parent-child, or friendship. Don't put the key to your happiness in someone else's pocket. Keep it in your own. So, please pass me a biscuit, and yes, the burnt one will do just fine.12. How did the author's dad react to the burnt biscuit?A. He set it aside for breakfast.B. He ate butter and jelly instead.C. He uttered his complaints loudly.D. He ate it up as if nothing happened.13. Which of the following words can best describe the author's dad?A. Caring.B. Determined.C. ProudD. Hardworking.14. What does the author suggest people do in the last paragraph?A. Show understanding to imperfect things.B. Ask the children to respect their parents.C. Enjoy the over-cooked biscuits willingly.D. Make important decisions on your own.15. In which section of a magazine may this passage appear?A. History and culture.B. Family and relationship.C. Cuisine and health.D. Entertainment and sports.第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。

2019-2020学年深圳宝安新安中学初中部高三英语下学期期末考试试题及答案

2019-2020学年深圳宝安新安中学初中部高三英语下学期期末考试试题及答案第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项ASan Francisco Bay Area is a great place if you're a sports fan as you'll find several events all year round and plenty of team pride. If you are anywhere close to the area during a game,these fantastic sports events are here for you.San Francisco Giants BaseballThe San Francisco Giants baseball team plays in SF at Oracle Park. This is a fun ballpark because it's always packed with great energy and offers views of the bay. It's one of the most popular San Francisco sports events. The Giants are part of the National League West Division. Since their arrival here in 1958,they have been World Series Champions three times.Golden State Warriors BasketballThe fan base of the Golden State Warriors distributes the whole San Francisco Bay Area as this region's only NBA team.Their regular season runs from late October through mid-April, and all home games are played at the Chase Center in San Francisco.In total, the Warriors has won six NBA championships.San Francisco 49ers FootballThe 49ers are San Francisco's NFL team, though they have recently moved to Levi's Stadium in Santa Clara, about an hour south of SF. The football team was named for the prospectors (探矿者) who arrived in the area in 1849 for the Gold Rush. They’ve won 5 Super Bowl championships, all between 1981 and 1994.San Jose Sharks HockeyThe San Jose Sharks represent the Bay Area in hockey (冰球).They were founded in 1991 as the only Bay Area team to compete in the NHL. Sharks fans love going to these San Francisco sports events at the SAP Center,which they call the Shark Tank,located about an hour southeast of SF.1.Where can a sports fan have a good view of the area?A.The Oracle Park.B.The Chase Center.C.Levi's Stadium.D.The SAP Center2.Which team has claimed the most titles according to the text?A.The Giants.B.The Golden State Warriors.C.The 49ers.D.The San Jose Sharks.3.Where is the passage probably taken from?A.A book review.B.A news report.C.A science fiction.D.A tourist magazine.BExperts are warning about the risks of extremely picky(挑剔的)eating after a teenager living on a diet of chips and crisps developed lasting sight loss. Eye doctors inBristolcared for the 17-year-old after his sight had gone to the point of blindness. Tests showed he had serious vitamin deficiency(缺乏). Dr. Denize Atan, who treated him at the hospital, said, “His diet was basically a portion of chips from the local fish and chip shop every day. He also used to snack on crisps and sometimes white bread and ham, and not really any fruit and vegetables.”The teenager saw his doctor at the age of 14 because he had been feeling tired and unwell. At that time he suffered from vitamin B12 deficiency, but he did not stick with the treatment or improve his poor diet. Three years later, he was taken to theBristolEyeHospitalbecause of progressive sight loss.He was not overweight or underweight, but he had lost minerals from his bones, which was really quite shocking for a boy of his age. In terms of his sight loss, he met the standards of being blind. “He had blind spots right in the middle of his sight,” said Dr Denize Atan, “That means he can’t drive and would find it reallyarduousto read, watch TV or recognize faces.”Dr Denize Atan said that parents should learn about the harm that can be caused by picky eating, and turn to experts for help. For those who are concerned , she advised, “It’s best not to be anxious about picky eating , and instead calmly introduce one or two new foods with every meal.” She said multivitamin tablets can supplement(补充) a diet, but cannot take the place of eating healthily. “It’s much better to take in vitamins through a varied and balanced diet,” she said, adding that too manycertain vitamins , including vitamin A, can be harmful ,“so you don’t want to overdo it.”4. What does Dr Denize Atan imply in paragraph 1?A. The diet of the boy is not balanced.B. Fruit and vegetables are rich in vitamins.C. Picky eating is common among teenagers.D. The cause of the boy’s disease is unknown.5. Why did the boy go to see his doctor at the age of 14?A. To improve his poor diet.B. To get some help to lose weight.C. To be treated for his discomfort.D. To slow down his progressive sight loss.6. What does the underlined word “arduous” in paragraph 3 probably mean?A. Important.B. Easy.C. Necessary.D. Difficult.7. What does the last paragraph mainly talk about?A. Reasons why the boy is seriously ill.B.Suggestions for the boy’s family to care for him.C. Advice for parents worried about picky eating.D. Waysof taking in enough vitamins and minerals.CAs one of the world’smost popular cultural mediums, cinema is at the leading position at the Taihu World Cultural Forum(论坛), an annual event that aims to improve cultural exchanges. So far this year, Chinese box office has already topped 58 billion yuan, the China Film Administration said. This indicates that China, the world’s second-largest movie market, is closing the gap with the United States, the world’s top cinema market.Cao Yin, director of the program center at China Movie Channel, said that China has 67,000 cinema screens. the most of any country, and the number is expected to increase to 80,000 by the end of next year. Saying that China has signed coproduction agreements with 22 countries (including the United States, Canada, Japan. India etc.) ,Cao added it has deepened cinematic exchanges between Chinese filmmakers and their foreign counterparts (同行).With the country’s huge native market, which produced more than 1,000 films in 2019, Hong Kong director Stanley Tong said he believes foreign filmmakers will increasingly seek cooperation with China. “International coproduction will become an important platform to send Chinese stories oversea and give us a broader vision of creation,” Tong said.Recently, over 80 percent of the world’s top 100 highest box-office titles have been action films. Tong said the films, in which plots are basically secondary to shining stunts (特技), is one of the easiest ways to appeal to foreign audiences. But it has been a decades-long struggle for Chinese filmmakers to sell their stories overseas. When asked what kinds of Chinese films would have the most global appeal. Yan Zhaozhu, chairman of the Taihu World Cultural Forum, said stories that address universal issues, such as environmental protection and climate change,are perhaps the best options.8. What is the purpose of the Taihu World Cultural Forum?A. To strengthen cultural exchanges.B. To build more cinemas in China.C. To invite more tourists to Taihu.D. To attract more international investment.9. What can we infer about Cao Yin’s opinion in Paragraph 2?A. Chinese box office has already overtaken the United States so farB. The screens of Chinese cinemas will be world-leading in the futureC. China has signed the most coproduction agreements with other countriesD. There will be more and more cooperations between Chinese filmmakers and other countries.10. How do Chinese filmmakers feel about selling their movies to the world right now?A. Easy.B. Disappointed.C. Challenged.D. Confused.11. What is the best title for the text?A. Box Office: Unclear FutureB. China: Top Second Movie MarketC. Cinema: The Leading Cultural PositionD. Chinese Filmmakers: Severe Competition SituationDEmojis are very popular among mobile phone and social media users. While there are emojis of almost every kind imaginable, from dinosaurs to joyful tears and eggplants, there is no emoji for forgiveness. Seeing the need to show understanding, aFinnish group decided it was time for a "forgiveness" emoji.Every year, the Unicode Consortium, which sets the standards, adds new emojis to the emoji keyboard on mobile phones and computers. In 2019, the Forgivemoji campaign was launched. Forgivemoji's site made an open call to the public to give their designs for a new forgiveness emoji, with the goal of presenting the symbol to the Unicode Consortium and getting it accepted by people.Tuomo Pesonen, communications director of the Unicode Consortium, explained why the forgiveness emoji isindispensablein today's world. “In our modern communication culture, emojis are an important way of expressing human feelings beyond words.” The campaign gained popularity, reaching over two million peoplearound the world. They received many designs, including a bandaged heart, two holding hands, and people from different cultures hugging.After hundreds of people offered their ideas for this emoji, the winner was announced in February 2020. Former Finnish president Tarja Halonen was selected to choose the winner as she has been important in building bridges between people. The emoji that will be presented to the Unicode Consortium is an image of two hands giving a thumbs-up symbol in front of a heart. If the Unicode Consortium accepts the design, it will become available to the public in late 2021.The Forgivemoji campaign goes far beyond having a strong influence on social media. The message of showing forgiveness and understanding is helpful for the world at large.12. What's the idea behind the Fogivemoji campaign?A. people develop pleasant habits.B. To get people more friendly to each other.C. To pick a forgiveness emoji for the public to use.D. To make mobile phones and computers more convenient to use.13. What does the underlined word “indispensable” in Paragraph 3 mean?A. Necessary.B. Different.C. Changeable.D. Interesting.14. Why was Tarja Halonen selected to choose the winner for the campaign?A. She launched the campaign herself.B. She designed the most popular emoji.C. She was familiar with the emoji history.D. She played an important role in relating people.15. What can be the best title for the text?A. Forgiveness is important for peopleB. Emoji for forgiveness is on the wayC. Emojis are becoming interestingly popularD. Finnish people explore the stories of emojis第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。

2019-2020学年深圳宝安新安中学初中部高三英语期中考试试卷及答案解析

2019-2020学年深圳宝安新安中学初中部高三英语期中考试试卷及答案解析第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项AWashington D.C. SightseeingWith the information below, you’re not missing anything in D.C.! Click Here to find the perfect hotel for your stay as well.The Old Town Trolley TourIt offers something for the whole family. Not only will it give them something fun to do, but it will give them a history lesson. This tour will last about three hours and it’s proper for people of all ages.African American History TourBe sure to take this tour because African Americans have had an important role in the making of our country. Take this historical four-hour tour, where you will visit some important sites including Museum of African American History and Culture.Comedy Walks Washington D.C.This is a great experience allowing you to enjoy the capital in a new way. The walking tour lasts for about one hour and thirty minutes, which takes place in less than a mile journey from the starting place.D.C. Twilight TourCheck out the D.C. Twilight Tour for a unique view of some of the most famous sites! What makes this two-hour guided tour truly unique is that you can view many wonderful sites at night time!1.Which tour is recommended to a tourist who is fond of hiking?A.The Old Town Trolley TourB.African American History Touredy Walks WashingtonD.C. D.D.C. Twilight Tour2.Which tour lasts longest?A.The Old Town Trolley TourB.African American History Touredy Walks WashingtonD.C. D.D.C. Twilight Tour3.Where will you read this text most likely?A.In a guidebook.B.In a magazine.C.In a newspaper.D.On the Internet.BAfter a year at sea, 16-year-old Laura Dekker can finally say, “Missionaccomplished!” Last month, she finished a daring trip around the world aboard her 38-foot boat, Guppy. Dekker, who is from theNetherlands, traveled more than 30,000 miles all by herself. She is the youngest person ever to sail around the globe alone.Dekker had wanted to lake on this challenge when she was even younger. She first tried to set sail at the age of 13, but a court in theNetherlandsstopped her. They said that she was too young to make such a risky trip by herself. But Dekker insisted she had the navigation skills and patience of an adult sailor.She finally took off on January 20, 2011. During her trip, Dekker battled loneliness, storms, and worries about pirates. But she also got to surf, scuba dive, and started a new hobby: playing the flute. Although Dekker didn’t spend all of her time at sea—she stopped at ports along the way—she did spend her 16lh birthday on the open ocean. To celebrate, she ate doughnuts for breakfast.But Dekker didn’t sail into the record books. Guinness World Records and the World Sailing Speed Record Council no longer recognize records for “youngest” sailors. They dropped the category in 2009 to discourage children fromattempting such dangerous feats (壮举). But that didn’t stop Dekker，who was born on a yacht during a seven-year world voyage undertaken by her parents.Dekker doesn’t mind that she won’t hold an official record. She says it was a personal goal, and she is happy she achieved it.“I am not disappointed at all that Guinness World Record won’t recognize my attempt.” Dekker wrote on her website. “I did not start on my trip to achieve any record…I did it just for myself.”4. Dekker wasn’t allowed to sail at the age of 13 because .A. people were concerned about her safetyB.she didn’t learn any sailing skills wellC. she had to continue her study at schoolD. she didn’t have enough patience for long trips5. What does the underlined word “accomplished” in Paragraph 1 mean?A. Failed.B. Completed.C. Continued.D. Started.6. In 2009 records for youngest sailors were canceled in order to .A. set a higher sailing standard for teen sailorsB. stop children entering Guinness World RecordsC. encourage parents to sail with their childrenD. prevent children making dangerous attempts7. What could be the best title for this passage?A. A New Guinness World Record in SailingB. A New Sailing Standard for Teen SailorsC. A Teen Girl Sailing Alone Aroundthe WorldD. The Youngest Sailor in Guinness World RecordsC14 days. That’s the time Chinese scientists took to identify the full genetic sequence of the novel coronavirus (新冠病毒) since its outbreak. It was shared with the WHO immediately, and has now become an important foundation for global researchers in the fight against the COVID-19. But first, let us turn the clock back 17 years, when it took months to identify the SARS virus. From months to 14 days, what changed? It turns out AI played an important part.The scientists first obtained bronchoalveolar lavage (BAL) fluid (支气管扩张灌洗液) samples from patients, isolated (分离) the DNA and RNA, then sequenced the genetic material by comparing them. AI’s advantage is its ability to recognize patterns among a flood of data.Let me put it in a simple way. Sequencing the coronavirus genome (基因组) is similarto looking for a needle in a haystack (干草堆)---looking for genotypes (基因型) with specific characteristics from a huge gene pool. That’s where search algorithm (算法), a branch of modern AI, comes in. Think of it as an efficient search engine, which can find the needle in the haystack. This search algorithm can shorten months-long genetic sequencing to weeks or even just a few days. Combined with macro-genomic sequencing and a virus library, this AI technology can also be used in tracking virus mutation (突变).AI doesn’t just support scientists. It can also help patients by improving the efficiency of diagnosis (诊断).Chinalaunched a Genomics Service, which can run multiple virus gene comparisons and produce a detailed report within 60 seconds. This algorithm hasbeen put into use inChinaand shared to the world for free.8. AI’s advantage is that it can ________.A. slow down the spread of coronavirusB. separate DNA from RNAC.identify specific genotypes rapidlyD. obtain samples from patients quickly9. The search algorithm helps shorten the time of genetic sequencing by __________.A. finding a needle in a haystackB. serving as a search engineC. combining with a virus libraryD. tracing virus mutation10. What do we know about the Genomics Service in the last paragraph?A. It has been widely used in the world.B. It is mainly based on blood test.C. It is for fast diagnosis of COVID-19.D. It is used to track COVID-19 patients.11. What’s the best title of the passage?A. 14 Days---ChinaMade it!B. AI Assists in COVID-19 FightC. Search Algorithm, Best ChoiceD. China’s Genomics ServiceDI was at my parent’s dinner table. Before me was a worn journal of thin and discolor1 ed pages. It was my grandfather’s journal and now belonged to my father. My grandfather had passed away in the months leading up to my birth. I never got to visit the places he had frequented and the people who had been a part of his life’s journey.I was now about to enter his world, through the words he had left behind. Within minutes, I wascaptivatedby the power of the written words. In the magical script (笔迹) before me, I was transported to another age when food was an everyday art, planned, prepared and enjoyed in the company of others, and a time when people had the heart to pause their own lives to embrace (拥抱) each other’s struggles. All this was conveyed to me in the beauty of the words that flowed together to connect with the writer’s mind and understand the world they lived in.That kind of writing seems to be lost on us today. We have gotten used to writing in bite-sized pieces for a public looking for entertainment, and hungry for information. No wonder, there are nearly 200 million bloggers on the Internet and a new blog is created somewhere in the world every half a second. Instead of adding to our collective wisdom, most of these writings reflectthe superficiality (肤浅) and impatience of our day and age.This not only robs us of the skill of writing impressive essays, it also prevents us from exploring what is indeed important. Writing humbles (使谦卑) us in a way that is vital for our character growth, by reminding us about the limits of the self and our appropriate place in the vast flow of life. Writing frees us by helping us explore the unknown so that we really open up to magic of the world around us. I saw all of this in the writing of my grandfather. And I’ve seen it again and again in the writings of the greatest thinkers of humanity. Their writing reflect deep thought on issues of human importance.12. The underlined word “captivated” in the second paragraph can be replaced by “________”.A. puzzledB. frightenedC. attractedD. defeated13. In the author’s grandfather’s age, people ________.A. lived a hard lifeB. cared about each otherC. were fond of writingD. treated food as an art14. The author begins the text with her grandfather’s journal in order to ________.A. show her respect to her grandfatherB. present the importance of good writingC. express her interest in reading as well as writingD. raise the problems with today’s writing15. In the last paragraph, the author is trying to _________.A. discuss what good writing is likeB. express her strong desire to learn writing skillsC. stress the effects of her grandfather’s journal on herD. show her admiration for her grandfather’s writing第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。

2019-2020学年深圳宝安新安中学初中部高三英语二模试卷及参考答案

2019-2020学年深圳宝安新安中学初中部高三英语二模试卷及参考答案第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项AThis online course is designed to provide you with work-ready skills including responding to job advertisements，writing application letters and resumes（简历）and developing inter-view skills．What topics will it cover?● The recruitment（招聘）and selection process● The job application● Planning for the interview● Developing interview skillsWhat will you achieve?By the end of the course，you'll be able to...● Assess the recruitment and selection process from an employer's point of view● Interpret an advertisement，job description and selection criteria correctly● Model a well-written job application● Plan for a job interviewWho is the course for?While this course appeals to trainees and graduates，it also applies to job seekersin the broader community looking to increasing their confidence and success rate when applying for work．Who develops the course?Central Queensland University．It is Australia's leading regional university．Our courses are designed alongside industry andmany include hands-on learning experiences and project-based learning．Our commitment to making real-world knowledge and skills accessible to all has seen us being awarded global recognition．1. What will students learn if they take the online course?A. The way to write a resume．B. The way to put an advertisement．C. The skills of talking with others．D. The skills of improving reading．2. Who is the online course intended for?A. Trainers．B. Interviewers．C. Job seekers．D. College students．3. Which ofthe following best describes the online course?A Cheap． B. Practical． C. Long-standing． D. World-class．BWhat acts of kindness will make us the happiest, and who tends to benefit the most? A newly-published review of decades of kindness research provides some answers.In this paper, researchers analyzed the results from 126 research articles looking at almost 200, 000 participants from around the world. The studies they chose measured well-being in various ways, including both mental and physical health. Some were experiments, where people did a kindness practice to observe its effects, while others just surveyed people about how kind and happy they were.As expected, people who were kind tended to have higher well-being. Lead researcher Bryant Hui wasastoundedthat the relationship wasn't stronger than it was, but he was still encouraged by the results.One thing Hui and his colleagues found was that people who performed random, informal acts of kindness, like bringing a meal to a sad friend, tended to be happier than people who performed more formal acts of kindness, like volunteering in a soup kitchen.The researchers also found that people who were kind tended to be higher in "eudaimonic happiness"(a sense of meaning and purpose in life) more than "hedonic happiness"(a sense of pleasure and comfort). Perhaps this makes sense, given that being kind takes effort, which reduces comfort but could make people feel better about themselves and their abilities, which would provide a sense of meaning.Being kind came with greater eudaimonic happiness for women than for men, too. According to Hui, this could be because, in many cultures, women are expected to be kinder than men; so, they may have more to gain from it. And younger participants experienced more happiness when they were kind than older participants, perhaps for developmental reasons, he says.Hui isn't sure why acting kind might have these different effects on different groups, but he points to theories put forth by researcher Elizabeth Midlarsky: Being kind may make us feel better about ourselves as a person or about the meaning of our lives, help us forget our own troubles and stresses, or help us be more socially-connected with others.4. What does the data in the second paragraph intend to show?A. The recent paper is worthy of being read.B. The recent paper gives convincing results.C. Kindness is always a hot topic of research.D. Kindness is closely linked to one's well-being.5. What does the underlined word "astounded" in paragraph 3 mean?A. Afraid.B. Certain.C. Excited.D. Surprised.6. Which of the following acts of kindness can make one feel happier according to paragraph 4?A. Volunteering in a hospital.B. Cleaning a community.C. Returning a lost item to its owner.D. Collecting donations for the poor.7. What do the researchers find from the paper?A. Being kind has different effects on different groups.B. Eudaimonic happiness makes people feel comfort.C. The younger experienced more happiness than the older.D. Female participants are kinder than male ones.CSometimes people make history. George Washington became the first president of theUnited Statesand made history. Sometimes wars make history. The two World Wars are examples. Sometimes nature even becomes part of history. Shaking earthquakes are recorded in history books.Sixteen years ago, nature caused just such a history-making event. In September 2005, Hurricane Katrina came ashore inNew Orleans,Louisiana. The deadly storm floodedNew Orleans. Before Katrina, no other big American city had ever flooded in the history of the country. This natural disaster caused great harm and death.New Orleansis located below sea level. This location places it at great risk. Levees were built to protectNew Orleansfrom the ocean. (A levee is like a wall between the city and the ocean.) When Hurricane Katrina came ashore, water moved over the levees into the city. Flooding made it necessary for everyone to leave the city. Before Katrina, Creole food (a special kind of cooking only inLouisiana) filled the air with delicious smells. The sound of jazz music traveled through the streets. Now the city has to return to its former glory.Before Katrina, ernment had never made everyone leave a city. People inNew Orleanshad to find shelter quickly. Some had to stay at theSuperdomeSportsCenter. Some rode on buses to other towns. Thousands drove their cars to get away from the storm. The roads and shelters filled up fast.The lesson learned from Katrina was that cities must be better prepared for big storms and other terrible disasters caused by nature. Being prepared might have kept more people safe. Hurricane Katrina is one of the history-making events that will be remembered forever. Today, history is still being made that will shape thefuture.8. What does the author tell us aboutNew Orleans?A. It was built above sea level.B. It had few jazz musicians after Katrina.C. It was the firstU.S.city that had been flooded.D. It created a wholly new way to cook after Katrina.9. What can we say about the levees?A. They were almost useless for fighting Katrina.B. They helped people leaveNew Orleansquickly.C. They made NewOrleansa special American city.D. They should be built to match the size ofNew Orleans.10. What might the author advise city governments to do?A. Put up more shelters in the city.B. Build more levees around the city.C. Teach people how to avoid floods.D. Try to get ready for natural disasters.11. What is the best title for the text?A. Storms are dangerousB. Katrina makes historyC. Floods shapeLouisianaD. History must be rememberedDWhen I was trying to find a place where to spend my December holidays, I met by chance some cheap flights to Iceland. After checking just a few winter pictures of Iceland, I realized that the country, known as the land of fire and ice, during the cold months of the year could offer me experiences I had never had before.For sure you can’t miss the chance to go to Iceland in winter if your traveling wish list includes at least one of the crazy experiences Iceland can offer. Iceland in the North Atlantic Ocean is a paradise (乐园) for all those who want to see the northern lights, experience cold weather conditions and put themselves in geothermal (地热的) baths while the snow is falling on their head.The best way to move around Iceland is with a rental car. Distances are huge and public transport in winter is not really common out of the major towns. As we wanted to be even more convenient we decided to rent a small camper (野营车). Sleeping and cooking in a camper saved us a lot of driving, money and gave us the chance tobe always in the right place at the right time.There were also no locals and in many cases no tourist facilities (设备). For us, as we slept in a camper, it waseasier. But for tourists traveling by normal cars it is necessary to check the opening times ofhotels and restaurants as many of them run just from June to September.It is amazing to experience how the weather is changing in Iceland. However, Icelanders prefer to stay inside their houses. They have even no time to complain about the weather in December. All they care about is Christmas. They love to decorate their houses, sing Christmas songs and eat typical Christmas food.12. Why is Iceland famous as the land of fire and ice?A. Because tourists would like to play with fire on the ice.B. Because it is too dry to easily cause fire to happen.C. Because it is hot inside a house and cold outside.D. Because there exist hot springs and freezing ice.13. What did the author think of the rented camper?A. It was not only practical but also economical.B. It was convenient but cost them more money.C. It provided the best chance to see the new country.D. It was much faster than other public transport.14. What does the last paragraph imply?A. The Icelanders prefer to live with their family.B. The joy of Christmas drives the freezing weather away.C. December is the coldest month of the year.D. The Icelanders are always positive and stay outside.15. What does this passage most probably come from?A. A textbookB. A scientific reportC. A travel magazineD. A news report第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。

2019-2020学年深圳宝安新安中学初中部高三英语下学期期中考试试题及参考答案

2019-2020学年深圳宝安新安中学初中部高三英语下学期期中考试试题及参考答案第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项AThe 2021 Weibo Movie Night—an award ceremony jointly organized by Sina Weibo and China Movie Channel—was held on June 12, gathering around 100 filmmakers and A-list stars. Following are some upcoming films.BipolarCast: Dou Jingtong, Tian Zhuangzhuang and Wang ZhiwenDirector: Li MengqiaoAudience will follow a young woman’s unusual trip across China,who wishes to send a stolen lobster (龙虾) back to the sea. Li said that it’s a sort of experiment, examining the line between dreams and reality. Andthis is singer-actress Dou Jingtong’s first leading role.On Your MarkCast: Wang Yanhui and Zhang YouhaoDirector: Chiu Keng Gua (Malaysia)Inspired from a true story,On Your Markis about a taxi driver and his son, a marathon enthusiast who’s struggling with a visually-impaired disease. In order to help his son to realize his dream, the father joins a marathon training group to serve as his son’s personal “competition assistant”. This film is expected to tug the heartstrings of moviegoers near Father’s Day.TheBattleatLakeChangjinCast: Wu Jing, Hu Jun, Li Chen and Zhang HanyuDirector: Chen Kaige, Tsui Hark and Dante LamThe film centers on how the Chinese People’s Volunteers fearlessly fought against foreign invaders during an extremely cold winter. The battle destroyed around 13,000 enemies of US troops, becoming a turning point to lay the foundation for the final victory.Chinese DoctorsCast: Zhang Hanyu, Yuan Quan, Zhu Yawen and Li ChenDirector: Liu WeiqiangAdapted from true stories, it is about Chinese medical staff’s battle to rescue lives during the COVID-19 outbreak last year inWuhanJinyintanHospital.1. Who plays the leading role inBipolar?A. Dou Jingtong.B. Yuan Quan.C. Li Mengqiao.D. Zhang Hanyu.2. Which film focuses on the war betweenChinaand theU.S.?A.Bipolar.B.On Your Mark.C.Chinese Doctors.D.TheBattleatLakeChangjin.3. What doOn Your MarkandChinese Doctorshave in common?A. They both star Zhang Hanyu.B. They are based on true stories.C. They reflect the efforts to rescue lives.D. They are directed by Chinese directors.BDisease-carrying mosquitoes can spread diseases without affecting themselves. Nearly 700 million people get a mosquito-borne illness each year, which results in over one million deaths. Humans experience continuous pressures from disease-carrying mosquitoes in many parts of the world, so we have to find ways to fight against those insects because they keep getting scarier.Even though DEET remains the most commonly used, and most powerful, mosquito repellent ever developed, scientists are actively pursuing effective products based entirely on plant oils. While DEET is an effective contact repellent, many people dislike the oily feel and smell on their skin, and sometimes some people are sensitive to it. Consumers are always interested in alternatives to DEET and other synthetic repellents, so there are numerous natural repellents on the market.In his lab atIowaStateUniversity, Dr. Joel Coats and his team have successfully tested these repellents against three species of dangerous mosquitoes. The first group of the new repellents act through the air. These chemicals have a vapor action that provides protection, and they are called “spatial” repellents, since they act through space. These are potentially most useful in backyards, parks, and houses. The other group are the classic ones that stop insects from standing on a treated surface, such as human skin, clothing or tents; collaborators at the USDA-ARS and BioGents have conducted testing with humans to confirm the effectiveness and identify the very best ones.The new repellents were designed and made from the natural materials in plant essential oils. They maintain many of the advantages of the natural repellents: They are fully biodegradable, with no ecological concerns or environmental wastes, and generally considered safe like the thousands of types of plant essential oils used in the flavor and perfume industries. However, thorough testing will be conducted to determine if they are truly non-poisonous because there is still no enough evidence.4. What does the author mainly want to show in paragraph 1?A. The way mosquitoes spread disease.B. The high death rate of mosquito-borne illness.C. The difficulty of fighting disease-carrying mosquitoes.D. The urgency of finding tools to fight against mosquitoes.5. What is a disadvantage of DEET?A. It won’t be effective for long.B. It can’t be applied universally.C. It causes discomfort to the users.D. It greatly harms people’s health.6. What can we learn about the second group of the new repellents?A. They can kill mosquitoes indirectly.B. They are mainly used in the open air.C. They are more effective on human skin.D. They can prevent mosquitoes from contacting users.7. What’s the author’s attitude to the new repellents?A. Subjective.B. Objective.C. Doubtful.D. Disapproving.CDragon boating is a team sport that has its root in ancient China. The boats are decorated with a dragon head and tail. In recent years cancer survivor groups have got involved in the sport to help make friends and help rebuild their lives.On a recent Saturday morning, a group of 20 women were on a boat in the Anacostia River in Washington DC. They moved their paddles(船桨)in rhythm to the call of a coach. The women belong to the dragon boat team GoPink! DC, which trains weekly. It also races against other breast cancer survivor teams in dragon boat festivals. As a result, GoPink! DC won medals in this Washington dragon boat festival.Lydia Collins joined five years ago after finding out she had breast cancer. “I was diagnosed with breast cancer.I was demoralized because of my illness - I lost all interest in life and wouldn't even get out of bed to eat. But now I love the team spirit. I just love everything about it. It is like a floating support group on the water.”The paddles are breast cancer survivors and their supporters. Annette Rothemel helped establish(建立)the group in 2006. She is a researcher with the National Institutes of Health as well as a breast cancer survivor. “It is sort of an easy entry sport because on the same boat people at different levels can be doing the same sport.” But Ms Rothemel saysdragon boating can be physically demanding, especially for someone who is sick and getting treatment for cancer.“It’s hard but I think you have to challenge yourself in life. This is something I look forward to. I get to be out here with my sisters and supporters that understand what I’m going through and help motivate me. So it makes me stronger and it makes me feel better,” another cancer survivor Rhonda Hartzel said.Annette Rothemel says the cancer survivors feel a sense of sisterhood and share good times when they paddle together. She says both feelings are treasured by the team.8. What do the underline wordsdemoralizedIn para.3 probably mean?A. depressedB. anxiousC. astonishedD. awkward9. What can we know about Lydia Collims from the text?A. she helps establish Go Pink !DCB. she tries to find a cure for the cancerC. she benefits from the dragon boat raceD. she gives up hope because of her illness10. How can the dragon boat race help the cancer survivorsA. forget their tough experiencesB. recover physically and mentallyC. get rid of the pains of their cancerD. enjoy their rest life without sufferings11. What does the text tell us about Annette Rothemel?A. she is an expert in studying the cause of the cancerB. she helps the cancer survivors in financial difficultiesC. she believes there is a healthful result from the dragon boat raceD. she thinks it unwise for the patient to join in the dragon boat raceDNostalgia (怀旧) has become increasingly common in our current climate of accelerated, unexpected change. More and more Americans are turning back with longing towhat feels like simpler, sweeter times. They collect cassette tapes, manual typewriters even decades-old video games.Is it a mistake to get too obsessed with the past? Some psychologists warn that too much devotion to the so-called good old days is an escape from reality; it can indicate loneliness or that a person is having a difficult time coping in the present. Psychologist Stephanie Coontz argues that nostalgia distracts us from addressing the problems of modern life and contribute to anxiety, depression , insomnia etc.But new studies suggest that a modest dose of nostalgia is not only harmless, but actually beneficial. They suggest it helps strengthen our sense of identity and makes us feel more optimistic and inspired. It is also a tool for self — discovery and memories are a psychological immune response that is triggered when you want to take a break from negativity. Interestingly, those happy memories can be particularly beneficial both to kids in their teens and to society's elders. Recalling our childhood reminds us of “the times when we were accepted and loved unconditionally," says Krystine Batcho, a psychologist. "That is such a powerfully comforting phenomenon, knowing that there was a time in life when we didn't have to earn our love." Nostalgia can transform even the most ordinary past into legends which warms the heart and the body. Let's not forget that nostalgia has been a source of inspiration to innumerable American writers. Mark Twain recalled his boyhood, writing, "after all these years, I can picture that old time to myself now, just as it was then：The white town drowsing in the sunshine of a summer's morning."So go ahead, daydream a little about your best childhood friend, your first car, a long - gone family pct. As Dr. Sedikidessays，"Nostalgia is ly central to human experience. "But at the same time, keep these words of wisdom from the great inventor Charles Kettering in mind as well："You can't have a better tomorrow if you are thinking about yesterday all the time. "312. What did some psychologists in paragraph 2 probably agree?A. Nostalgia will cause some mental problems.B. Nostalgia makes us devoted to the good old days.C. Nostalgia shows you are trying to get rid of loneliness.D. Nostalgia helps us cope with the difficult time we are going through.13. There are many benefits of nostalgia except ________A. It can enable us to know ourselves better.B. It can bring us some comfort when we recall.C. We are likely to gain attention if we recall the happy childhood.D. We can sometimes break away from negativity with happy memories.14. What will be talked about in the following paragraph?A. The bad influence of too much devotion to nostalgia.B. The reasons why we should avoid nostalgia.C. The bad memories that always stick around you.D. The great changes nostalgia will bring to you.15. What's the best title of the passage?A. We all have a soft spot for nostalgia.B. Nostalgia is actually good for you.C. Don't be carried away by nostalgia.D. There are many times when we like to recall.第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。

2019-2020学年深圳宝安新安中学初中部高三英语下学期期末考试试题及答案解析

2019-2020学年深圳宝安新安中学初中部高三英语下学期期末考试试题及答案解析第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项AWhat are you waiting for? A new series of movies shown this year can’t be missed. Have you enjoyed them already?Frozen IIFrozen was the highest grossing (票房) animated film ever. In Frozen II Elsa, Anna, Olaf and Krist left off Arendelle to seek thesource of Elsa’s icy magic. Although the millions of children who loved the first film are older now, they might give it a reception.Last ChristmasA festive romantic comedy, Emilia Clarke stars in Last Christmas as Bridget Jonesy , a shop assistant, whose life in London is a mess, and Henry Golding as the eligible bachelor(黄金单身汉)who tidies it up. The film’s director, Paul Feig, and co-writer, Emma Thompson, promise that the film is worth expecting.A Beautiful Day in the NeighborhoodTom Hanks stars in A Beautiful Day in the Neighborhood as the only American celebrity(名人) more famous than he is. As the host of Mister Rogers’ Neighborhood for more than 30 years, Fred Rogers is a legend of pre-school children’s television, which appeals to a large audience.Charlie’s AngelsHollywoodaction movies starring women are rare. But have you seen a movie starred, written and directed by women, too? Charlie’s Angels is one of the first. A reboot (翻拍) of the 1970s TV series, not to mention the two films from 2000 and 2003, the new version is directed by Elizabeth Banks. She also plays Bosley, one of the female detectives who are employed by Charles Townsend to go on global adventures.1. Which moviebecame the most popular cartoon film this year?A. Frozen II.B. Last Christmas.C. A Beautiful Day in the Neighborhood.D. Charlie’s Angels.2. Which character works on a TV station?A. Krist.B. Emilia Clarke.C. Fred Rogers.D. Bosley.3. Which action movie was directed and starred by a woman?A. Frozen II.B. Last Christmas.C. A Beautiful Day in the Neighborhood.D. Charlie’s Angels.BThis is Scientific America's 60-Second Science. I am Christopher Intagliata.The Apollo missions brought back 842 pounds of rock and soil from the moon, that's nearly 2200 different samples. But the most interesting one, according to a scientist Meenakshi Wadhwa, is a sample named "Apollo 1-0-0-8-5collected by Neil Armstrong on Apollo 11.“He was about to step back into the lunar module(登月舱) when he turned around and saw there were little spaces in the rock box. He knew that geologists on earth would be just so excited to study these materials, so he just scooped up nine scoops(勺) of soil and put it into the box." Wadhwa explained.It was one of the most well studied samples of the Apollo missions. And a geologist named John Wood noticed white flecks(微粒) of rock in the soil, which inspired him to dig deeper into the moon's ancient past.“This was quite a leap of imagination — he proposed that the whole of the moon had been almost covered with a magma(岩浆) ocean nearly 4.5 billion years ago. This was a revolutionary idea at the time, because people had thought the moon had formed cold, so it completely changed our idea how the moon formed.”But Wadhwa has a more personal reason to appreciate this sample. She met her husband Scott Parazynski also because of this rock sample. Scott, a mountaineer at that time, wanted to climbMount Everestwith a moon rock while Wadhwa was the chairman of the NASA committee that gives access to the samples for scientific purposes.Neil Armstrong's last-minute scoop of moon dust brought two people together here on Earth and upturned our understanding of how the moon — and the Earth itself-got here.Thank you for listening for Scientific American's 60-Second Science.4. It can be learned from Paragraph 3 that ________ .A. Neil Armstrong was excited to find the soilB. the spaceship was about to land on the moonC. Sample "Apollo1-008-5" was collected at the last minuteD. scientists were not satisfied with the samples brought back by Neil5. Which of the following statements is TRUE according to the text?A. Scott made a new proposal about the moon's origin.B. The Apollo missions brought back 842 rock samples.C. "Apollo 1-0-0-8-5" brought new evidence to the moon's formation.D. Wadhwa and her husband climbedMount Everestwith a moon rock.6. What is this text?A. A short interview.B. An introduction to a scientist.C. An inspiring speech.D. A broadcast story of a program.7. What is the text mainly about?A. A romantic story of a moon rock.B. A big leap made by Neil Armstrong.C. An unusual task for Apollo missions.D. An unexpected discovery in moon exploration.CThe idea of growing food in a desert would make most people laugh but this is quickly becoming a reality. There are currently two desert farms in the world where quality vegetables are being planted cheaply and easily.Sundrop Farms, based in South Australia, uses experimental greenhouses to grow tomatoes, peppers and cucumbers. The biggest challenge of growing food in a desert, obviously, is the lack of available water. The researchers at Sundrop Farms have gotten aroundthis problemby using the sun to desalinate (淡化) sea water. It can also be used to control the temperature of the greenhouses.Without depending on limited resources such as land and fresh water Sundrop Farms has made farming a practice. This can increase the world’s food supplies. Another benefit ofthis kind of farming is that it can be done anywhere, thus reducing the costs of transporting food to distant locations. Yet another benefit is that it reduces the need for pesticides (杀虫剂).Another experimental desert farm is the Sahara Forest Project, which began in Qatar in December 2012. Greenhouses in the farm are cooled by saltwater. Solar power and other technologies are used together to help make vegetation (植被) grow in the desert environment. As deserts have expanded over recent years around the world due to global warming, this project could solve the problem.The result form the Qatar project were better than expected and in June of 2014, Jordan agreed to host another one. This will be much bigger than the Qatar project and the project members will have even more opportunities to test their experiments on a much larger scale. It is not clear yet that desert farming resents thefuture of farming but these projects have shown some success in the field.8. What does “this problem” in paragraph 2 refer to?A. Sea water is bard to purify.B. The desert is short of water.C. The temperature is high in the desert.D. Desert farms aren’t fit to plant vegetables.9. What is one of the characters of desert farming?A. It needs more pesticides.B. It saves delivery costs.C. It has a location limit.D. It solves food waste problems10. What can we know about the Sabara Forest Project?A. It lives up to expectationsB. It can help produce more foodC. It is started to prevent global warmingD. It uses technology to produce saltwater11. What can be inferred about desert farming from the last paragraph?A. It still has problems to solve.B. It represents the future of farming.C. Its early success has aroused interest in it.D. Its aim is to create more job opportunities.DThere will be more plastic than fish in the world’s oceans by 2050. That is what a new report from the World Economic Forum and Ellen MacArthur Foundation warns. If the current trend continues, the report said, oceans will contain one ton of plastic for every three tons of fish in 2025. By 2050, plastics will weigh more than fish. The problem is that each year at least 8 million tons of plastics end up in oceans around the world. This is the same as dumping the contents of one garbage truck into the ocean every minute.Not all plastic ends up in the ocean because someone throws a plastic bottle into the water. Plastic containers and other trash thrown onto streets and sidewalks often are swept into oceans. Unlike other types of trash in the ocean, the plastic never bio-degrades. There is a way to slow the amount of plastics going into the oceans — people can recycle more. Currently only about 14 percent of plastics are recycled. Research in Europe shows as much as 53 percent of plastic could be recycled using available technology. The report says that another solution isusing less plastic for packaging products. But that is not likely to happen.“Given plastic packaging’s many benefits, both the possibility and desirability of an across-the-board dramatic reduction in the volume of plastic packaging used is clearly low, ”the report said. But the authors note reducing the use of plastics should be tried“where possible. ”For decades, scientists warned that plastics are killing fish. Research shows that fish are dying from choking after eating plastics. Another cause of death is that plastics cause“intestinal blockage and starvation, ”the environmental group said.12. Why is the garbage truck mentioned in Paragraph 1 ?A. To explain how plastics end up in the ocean.B. To warn people against the ocean pollution.C. To clarify the seriousness of the problem.D. To point out some details of the report.13. Why is plastic more dangerous than other types of trash?A. There is too much of it.B. It poisons the ocean water.C. It is from different sources.D. It is hard to break down.14. What is the author’s attitude to the suggested solutions?A. Pessimistic.B. Curious.C. Unconcerned.D. Terrified.15. What can we infer from the text?A. People are not aware of the problem.B. Recycling is limited by lack of technology.C. Plastic packaging has become part of our life.D. Fish in the ocean will be replaced by plastics.第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。

2019-2020学年深圳宝安新安中学初中部高三英语第二次联考试卷及答案

2019-2020学年深圳宝安新安中学初中部高三英语第二次联考试卷及答案第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项AThe Middlerby Kirsty ApplebaumEleven-year-old Maggie lives in Fennis Wick, enclosed and protected from the outside world. Her brother Jed is the eldest, a hero. Her younger brother is Trig—everyone loves Trig. But Maggie's just a middler；she is left behind. In this book, we experience the sadness of being the forgotten middle child, the child with no voice, even in her own family.Dennis in Jurassic Barkby Nigel AuchterlounieBeanotown is in trouble again, and this time the danger is Jurassic! Dennis，latest adventure is filled with fun, including Vikings, Victorians and soon, along with puzzles for you to finish. Can you help Dennis save Beanotown from the prehistoric invasion?Little Book for Big Changesby Karen Ng and Kirsten LiepmannIncluding more than 100 activities, try-outs, games, puzzles and tips,Little Book for Big Changesoffers fun and creative ways to bring people together to help change the world. Understand more about big problems in the world such as inequality and climate change, and be empowered to help make the world a better place.The Saga of Erik the Vikingby Terry JonesIn this illustrated story, Erik the Viking sets out with his trusty team of men in search of the land where the Sun goes at night. On his journey, he will meet adventures that will put his courage to the test.1. Who told a story about an unseen child in a family?A. Terry Jones.B. Kirsty Applebaum.C. Nigel Auchterlounie.D. Karen Ng and Kirsten Liepmann.2. Which book is proper for kids who love prehistoric-related stories?A.The Middler.B.Little Book for Big Changes.C.Dennis in Jurassic Bark.D.The Saga of Erik the Viking.3. What is special aboutLittle Book for Big Changes"!A. It is about two people.B. It is an adventure book.C. It has picturesinside to help kids read.D. It teaches kids to care for the world.BWhat a day! I started at my new school this morning and had the best time. I made lots of new friends and really liked my teachers. I was nervous the night before, but I had no reason to be. Everyone was so friendly and polite. They made me feel at ease. It was like I'd been at the school for a hundred years!The day started very early at 7:00 am. I had my breakfast downstairs with my mom. She could tell that I was very nervous. Mom kept asking me what was wrong. She told me I had nothing to worry about and that everyone was going to love me. If they didn't love me, Mom said to send them her way for a good talking to. I couldn't stop laughing.My mom dropped me off at the school gates about five minutes before the bell. A little blonde girl got dropped off at the same time and started waving at me. She ran over and told me her name was Abigail. She was very nice and we became close straight away. We spent all morning together and began to talk to another girl called Stacey. The three of us sat together in class all day and we even made our way home together! It went so quickly. Our teacher told us that tomorrow we would really start learning and developing new skills.I cannot wait until tomorrow and feel as though I am really going to enjoy my time at my new school. I only hope that my new friends feel the same way too.4. How did the author feel the night before her new school?A. Tired.B. ConfidentC. Worried.D. homesick5. What did the author think of her mother’s advice?A. Clear.B. Funny.C. OptionalD. Respectable6. What happened on the author's first day of school?A. She met many nice people.B. She had a hurried breakfast.C. She learned tome new skills.D. She arrived at school very early.7. What can we infer about Abigail?A. She disliked Stacey.B. She was shy and quiet.C. She got on well with the author.D. She was an old friend of the author.CWhere doyou usually put your toothbrush?Do you keep it in the bathroom? How’s your toothbrush looking these days? Even if you can’t see it with a naked eye, experts say it may be saturated(使饱和)with millions of toilet germs!Dr. Charles Oerba, a germ expert, is amicrobiology professor at the University of Arizona. He says there are approximately 3 million bacteria per square inch in most toilet bowls, and every time you flush it without closing the lid, those millions of bacteria droplets spray into the air as far as twenty feet away and dirty everything in their path. And a common victim is your poor toothbrush, usually, left out on the bathroom sink, right?So, what do we do? Dr. Gerba says it’s easy. Close the toilet lid before you flush—that’ll greatly cut downthe germs, which will otherwise float in the air. And wash your toothbrush every few days in mouthwash or peroxide to get rid of any germs hiding in it. You can even put it through the dishwasher to sanitize(消毒)it. And always store your toothbrush in a closed cabinet.Here’s one more tip from Dr. Gerba, who says our kitchen sink is probably dirtier than our toilet. “If an alien came from space and studied the bacterial counts, he probably would conclude he should wash his hands in your toilet and go to the bathroom in your sink.” He says that’s because the kitchen sink is a great place where E. coli(大肠杆菌)to live and grow since it’s wet and damp. Bacteria feed on the food that people put down the drain or—that’s left on dishes in the sink. To reset your sink’s bacteria count back to zero, you’d better regularly wash it with hot water and sanitize yoursink with special chemicals. In fact, you may want to do it every day or before preparing dinner.8. What is the purpose of the text?A. To show how to brush your teeth.B. To tell people the importance of health.C. To warn people of the invisible germs.D. To introduce a microbiology professor.9. What can we learn from Paragraph 2?A. Bathroom sinks are the dirtiest places.B. Bacteria are bad for people’s health.C. Why bacteria spread through the air.D. How bacteria spread in the bathroom.10. What does the underlined word“that”in Paragraph 4 refer to?A. The food.B. The toothbrush.C. The sink.D. The chemical.11. Why does Dr. Gerba mention the example of an alien?A. To tell us a fiction story of an alien studying bacteria.B. To show our kitchen sink may be dirtier than our toilet.C. To teach us how to reset sink’s bacteria count back to zero.D. To prove coli prefers to live in the kitchen and the drain.DThe Gata used to look annoyed when they received power bills that routinely topped $200. Last September the couple moved into a 1,500-square-foot home in Premier Gardens, an area of 95 “zero-energy homes” (ZEH) just outside town. Now they're actually eager to see their electricity bills. The grand total over the 10 months they've lived in the three-bedroom house: $75. For the past two months, they haven’t paid a cent.ZEH communities are the leading edge of technologies that might someday create houses that produce as much energy as they consume. Premier Gardens is one of a half-dozen subdivisions (住宅开发项目) in California where every home cuts power consumption by 50%, mostly by using low power appliances and solar panels.Aside from the panels on the roof, Premier Gardens looks like a community of traditional homes. But inside, special windows cut power bills by blocking solar heat in summer and keeping indoor warmth winter.The rest of the energy savings comes from the solar units. They don't just feed the home they serve. If they generate more power than the home is using, the excess flows into the utility's power grid(电网). The residents are billed by “net metering”: they pay for the amount of power that they get from the grid, minus the kilowatts(千瓦) they feed into it. If a home generates more power than it uses, the bill is zero.That sounds like a bad deal for the power company, but it's not. Solar homes produce the most power on the hot sunny afternoons when everyone rushes home to turn up the air conditioner. "It helps us lower usage at peak power times," says solar expert Mike Keesee. “That lets us avoid building costly plants or buying expensive power at peak usage time.”What’s not to like? Mostly the costs. The special features can add $25,000 or more to the purchase price of a house. Tax breaks bring the cost down, especially in California, but in many states ZEHs can be extremely expensive. For the consumer, it's a matter of paying now for the hardware to save later on the power bill.12. Why is the Gata eager to see their electricity bills now?A. They want to cut down their utility' expenses.B. They want to know if they are able to pay.C. They want to see how much they have saved.D. They want to avoid being overcharged.13. What is special about the ZEH communities?A. They are built in harmony with the environment.B. They have created cutting edge technologies.C. They are subdivided into half a dozen sections.D. They aim to be independent in power supply.14. What does the "net metering" practice mean to the power company?A. More pressure at peak timeB. Reduced operational costs.C. Increased electricity output.D. Less profits in the short term.15. The author believes that buying a house in a ZEH community __________.A. is a worthy investment in the long runB. is but a dream for average consumersC. gives the owner great tax benefitsD. contributes toenvironmental protection第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。

1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。