初三提高训练营第四期(2017)

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新人教版九年级数学上册同步提升训练：22.1.1 二次函数

优质文档新人教版九年级数学上册同步提升训练：22.1.1 二次函数———提优清单———提优点1：二次函数的概念及一般形式提优点2：根据实际问题列二次函数关系式———典型例题———【例1】下列一定是二次函数的有（）①y =2x 2－4xz ＋3；②y =4－3x ＋7x 2；③y=（2x －3）（3x－2）－6x 2；④y =21x－3x ＋5；⑤y =ax 2＋bx ＋c （a ，b ，c 为常数）；⑥y =（m 2＋1）x 2－2x －3（m 为常数）；⑦y =m 2x 2＋4x －3（m 为常数）．A ．1个B ．2个C ．3个D ．4个【方法总结】判断一个函数是不是二次函数，先把关系式化简整理，再分三个步骤来判断：（1）看它是否是整式，如果不是整式，则必不是二次函数；（2）当它是整式时，再看它是否是自变量的二次式，如果是自变量的二次式，那就是二次函数，否则就不是；（3）看它的二次项系数是否为0，如果不为0，那就是二次函数．【例2】（2011•山东青岛）某商场经营某种品牌的童装，购进时的单价是60元．根据市场调查，在一段时间内，销售单价是80元时，销售量是200件，而销售单价每降低1元，就可多售出20件．（1）写出销售量y 件与销售单价x 元之间的函数关系式；（2）求销售该品牌童装获得的利润w 元与销售单价x 元之间的函数关系式．【方法总结】列具体问题中的函数关系式，一般采取三步走的策略：第一步认真审题，弄清题意，找出具体问题中的已知量和未知量，并分析出它们之间的关系；第二步套关系，列出函数关系式；第三步根据题意，确定自变量的取值范围．变式：（2015•黑龙江哈尔滨期中）如图，用一段长为30米的篱笆围成一个一边靠墙（墙的长度不限）的矩形菜园ABCD ，设AB 边长为x 米，则菜园的面积y （米2）与x（米）的关系式为．（不要求写出自变量x 的取值范围）【例3】（2015•四川成都模拟）如图，已知等腰直角△ABC的直角边长与正方形MNPQ 的边长均为20cm ，AC 与MN 在同一直线上，开始时点A 与点N 重合，让△ABC 以每秒2cm 的速度向左运动，最终点A 与点M 重合．（1）求重叠部分面积y （cm 2）与时间t （s ）之间的函数关系式；（2）当t =5时，求y 的值；（3）当y =128时，求t 的值．【方法总结】已知x 求函数y 的值，实质上是求代数值的值；已知y 求自变量x 的值，实质上是解方程求方程的根．———分层提优——— 复习巩固提优1．（☆2013•湖南怀化）下列函数是二次函数的是（） A ．y =2x ＋1 B ．y =－2x ＋1 C ．y =x 2＋2 D ．y =21x －2 2．（☆2014•浙江杭州模拟）二次函数y =2x （x －3）的二次项系数与一次项系数的和为（）A ．2B ．－2C ．－1D ．－4 3．（☆☆ 2014•安徽省）某厂今年一月份新产品的研发资金为a 元，以后每月新产品的研发资金与上月相比增长率都是x ，则该厂今年三月份新产品的研发资金y （元）关于x的函数关系式为y= ．4．（☆☆2015•四川南充模拟）二次函数y=x2＋2x－7的函数值是8，那么对应的x的值是．5．（☆☆）已知函数y=（m2－m）x2＋（m－1）x＋m＋1．（1）若这个函数是一次函数，求m的值；（2）若这个函数是二次函数，则m的值应满足什么条件？6．（☆☆☆）在一块长方形镜面玻璃的四周镶上与它的周长相等的边框，制成一面镜子．镜子的长与宽的比是2：1．已知镜面玻璃的价格是每平方米120元，边框的价格是每米30元，另外制作这面镜子还需加工费45元．设制作这面镜子的总费用是y元，镜子的宽度是x米．（1）求y与x之间的关系式；（2）如果制作这面镜子共花了195元，求这面镜子的长和宽．综合运用提优7．（☆2015•浙江杭州期中）下列函数关系中，可以看做二次函数y=ax2+bx+c（a≠0）模型的是（）A．在一定的距离内汽车的行驶速度与行驶时间的关系B．我国人口年自然增长率1%，这样我国人口总数随年份的关系C．竖直向上发射的信号弹，从发射到落回地面，信号弹的高度与时间的关系（不计空气阻力）D．圆的周长与圆的半径之间的关系8．（☆☆2015•浙江丽水模拟）如图，四边形ABCD中，∠BAD=∠ACB=90°，AB=AD，AC=4BC，设CD的长为x，四边形ABCD的面积为y，则y与x之间的函数关系式是（）A．y=225x2B．y=425x2C．y=25x2D．y=45x29．（☆☆☆2014•湖北武汉联考）某商品现在的售价为每件60元，每星期可卖出300件．市场调查反映：如果调整价格，每涨1元，每星期要少卖8件；每降价1元，每星期可多卖12件．已知商品的进价为每件40元．（1）设每件涨价x（x为整数）元，每星期售出商品的利润为y元，求出y关于x的函数关系式；（2）设每件降价x（x为整数）元，每星期售出商品的利润为y元，求出y关于x的函数关系式；（3）问如何定价才能使每星期售出商品的利润达到6248元．10．（☆☆☆）如图所示，在矩形ABCD中，AB=6厘米，BC=12厘米，点P在线段AB上，P从点A开始沿AB边以1厘米/秒的速度向点B移动．点E为线段BC的中点，点Q从E点开始，沿EC以1厘米/秒的速度向点C移动．如果P、Q同时分别从A、E出发，写出出发时间t与△BPQ 的面积S的函数关系式，求出t的取值范围．拓广探究提优11．（☆☆☆☆☆2011•吉林省）如图，梯形ABCD中，AD∥BC，∠BAD=90°，CE⊥AD于点E，AD=8cm，BC=4cm，AB=5cm．从初始时刻开始，动点P，Q分别从点A，B同时出发，运动速度均为1cm/s，动点P沿A→B→C→E的方向运动，到点E停止；动点Q沿B→C→E→D的方向运动，到点D停止，设运动时间为x s，△PAQ的面积为y cm2，（这里规定：线段是面积为0的三角形）解答下列问题：（1）当x=2s时，y= cm2；当x=92s时，y= cm2．（2）当5≤x≤14 时，求y与x之间的函数关系式．（3）当动点P在线段BC上运动时，求出y=415S梯形ABCD 时x的值．———参考答案———例1．【答案】B【解析】①y =2x 2－4xz ＋3，含有两个自变量，不是二次函数；③y =（2x －3）（3x －2）－6x 2=－13x ＋6，是一次函数；④y =21x －3x ＋5，分母中含有自变量，不是二次函数；⑤y =ax 2＋bx ＋c （a ，b ，c 为常数），不一定是二次函数；⑦y =m 2x 2＋4x －3（m 为常数）不一定是二次函数．②y =4－3x ＋7x 2，是二次函数；⑥y =（m 2＋1）x 2－2x －3（m 为常数），m 2＋1≠0，一定是二次函数．∴只有②⑥一定是二次函数．例2．【解析】（1）根据题意，得y =200＋（80－x ）×20=－20x ＋1800，所以销售量y 件与销售单价x 元之间的函数关系式为y =－20x ＋1800（60＜x ≤80）；（2）w =（x －60）y =（x －60）（－20x ＋1800）=－20x 2＋3000x －108000，所以销售该品牌童装获得的利润w 元与销售单价x 元之间的函数关系式w =－20x 2＋3000x －108000．变式：【答案】y =－21x 2＋15x 【解析】∵AB 边长为x 米，而ABCD 是矩形，∴BC =21（30－x ），菜园的面积=AB ×BC =21（30－x ）•x ，∴y =－21x 2＋15x ．例3．【解析】（1）△ABC 是等腰直角三角形，则重叠部分也是等腰直角三角形，AM =20－2t ，则重叠部分面积y =12×AM 2=12（20－2t ）2=2t 2－40x ＋200；（2）当t =5时，y =12（20－2×5）2=50；（3）当y =128时，12（20－2t ）2=128，解得t 1=2，t 1=18（舍去），∴t =2． 1．【答案】C【解析】y =2x ＋1，y =－2x ＋1，y =21x －2都是一次函数，y =x 2＋2是二次函数．2．【答案】D【解析】y =2x （x －3）=2x 2－6x ，所以二次项系数与一次项系数的和=2＋（－6）=－4． 3．【答案】a （1＋x ）2【解析】根据增长后的量=增长前的量×（1＋增长率），可知今年二月份新产品的研发资金为a （1＋x ）元，则三月份新产品的研发资金为a （1＋x ）（1＋x ）=a （1＋x ）2． 4．【答案】3和－5【解析】根据题意，得x 2＋2x －7=8，即x 2＋2x －15=0，解得x =3或－5． 5．【解析】（1）根据一次函数的定义，得m 2－m =0，解得m =0或m =1，又∵m －1≠0即m ≠1．∴当m =0时，这个函数是一次函数；（2）根据二次函数的定义，得m 2－m ≠0，解得m 1≠0，m 2≠1．∴当m ≠0且m ≠1时，这个函数是二次函数．6．【解析】（1）y =（2x ＋2x ＋x ＋x ）×30＋45＋2x 2×120=240x 2＋180x ＋45；（2）由题意可列方程240x 2＋180x ＋45=195，整理得8x 2＋6x －5=0，即（2x －1）（4x ＋5）=0，解得x 1=0.5，x 2=－1.25（舍去）， ∴x =0.5，∴2x =1．答：镜子的长和宽分别是1m 和0.5m ． 7．【答案】C【解析】A 、距离一定，汽车行驶的速度与行驶的时间的积是常数，即距离，速度与时间成反比例关系；B 、设原来的人口是a ，x 年后的人口数是y ，则y =a （1＋1%）x ，不是二次函数关系；D 、设半径是r ，则周长C =2πr ，是一次函数关系． 8．【答案】C【解析】作AE ⊥AC ，DE ⊥AE ，两线交于E 点，作DF ⊥AC 垂足为F 点，∵∠BAD =∠CAE =90°，即∠BAC ＋∠CAD =∠CAD ＋∠DAE ，∴∠BAC =∠DAE ，又∵AB =AD ，∠ACB =∠E =90°，∴△ABC ≌△ADE （AAS ），∴BC =DE ，AC =AE ．设BC =a ，则DE =a ，DF =AE =AC =4BC =4a ，CF =AC －AF =AC －DE =3a ，在Rt △CDF 中，由勾股定理，得CF 2＋DF 2=CD 2，即（3a ）2＋（4a ）2=x 2，解得a =5x，∴y =S 四边形ABCD=S梯形ACDE=21×（DE ＋AC ）×DF =21×（a ＋4a ）×4a =10a 2=52x 2．9．【解析】（1）y ＝（60＋x －40）（300－8x ）＝－8x 2＋140x ＋6000；（2）y ＝（60－x －40）（300＋12x ）＝－12x 2－60x ＋6000；（3）当涨价时，－8x 2＋140x ＋6000＝6248，解得x 1=2，x 2=231（舍去）；当降价时，－12x 2－60x ＋6000=6248，解得x 1=2，x 2=331（舍去）．因此，售价为每件62元或58元时，每星期售出商品的利润达到6248元． 10．【解析】∵PB =6-t ，BE +EQ =6+t ，∴S =12PB •BQ =12PB •（BE +EQ ）=12（6-t ）（6+t ）=-12t 2+18， ∴S =－12t 2＋18（0≤t ＜6）． 11．【解析】（1） 2；9．（2）当5≤x ≤9时，如图：CQy = S 梯形ABCQ －S △ABP –S △PCQ =21（5＋x －4）×421-×5（x －5）21-（9－x ）（x －4）=12x 2－7x ＋652，所以y =12x 2－7x ＋652；当9＜x ≤13时，如图：CPy =21（x －9＋4）（14－x ）=－12x 2＋192x －35，所以y =－12x 2＋192x －35；当13＜x ≤14时CPQ )y =21×8（14－x ）=－4x ＋56，所以y =－4x ＋56．（3）当动点P 在线段BC 上运动时， ∵154=y S 梯形ABCD154=×21（4＋8）×5 = 8，即x ²－14x ＋49 = 0，解得x 1 =x 2 = 7， ∴当x =7时，154=y S 梯形ABCD．。

文苑中学九年级提高班习题(四)

文苑中学九年级提高班习题（四）一、积累与运用（28分）1、（2分）下列选项中加点字注音全都正确的一项是（）A．咀嚼．（jiáo）忖．度（dù）铿．锵有力（kēnɡ）B．伺．候（ sì）聒．噪（ɡuō）恃．才放旷（shì）C．麾．下（huī）带挈．（qiâ）唯．唯连声（wěi）D．契．友（ qì）拙．病（zhuō）翘．首远望（qiào）2、（2分）下列选项中没有错别字的一项是（）A．敦厚慰籍折中是非 B．连漪弩钝鼎礼膜拜C．簇新酬酢深居简出 D．侧隐徉装有例可援3、下列选项中加点成语运用正确的一项是（）A．危难之时，绿色的迷彩撑起了生命的希望，人民解放军无愧为共和国的中流砥柱．．．．。

B．尽管落水儿童大声呼救，但他还是充耳不闻．．．．地走开了。

C．齐白石画展一开幕，绘画爱好者趋之若鹜．．．．，争相观瞻。

D．回到家乡，我欣喜地发现砂石土路已经被宽阔的马路代替，鳞次栉比．．．．的汽车川流不息。

4、（2分）对四大名著中人物和情节的描述不正确的一项是( )A. 八十万禁军教头林冲，因高俅陷害发配沧州，途经野猪林，被花和尚鲁智深相救，才保住性命。

B. 刘姥姥是《红楼梦》中的人物。

她虽贪图小利，但心地善良，在贾府人亡势危之时，是她搭救了王熙凤的女儿晴雯。

C. 《三国演义》中忠义的化身是关羽，我们所熟知的的故事有：三英战吕布、温酒斩华雄、千里走单骑、华容道义释曹操、过五关斩六将、水淹七军、败走麦城等。

D. 《西游记》中唐僧师徒共经历了九九八十一难。

如，三打白骨精，偷吃人参果，大战红孩儿等都是人们熟悉的经典故事。

5、（2分）下列选项中没有语病的一项是（）A．有没有错别字，句子是否通顺，是评定好文章的标准之一。

B．在知识的海洋中，使我们深深感到自己的不足。

C．摇滚乐那强烈快速的节奏和迷离闪烁，让人看得眼花缭乱。

D．为减少沙尘暴的危害，有关部门调查研究了沙尘来源，制定出防沙措施。

初三提高班练习

初三提高班练习3【古文阅读】苏轼，字子瞻，眉州眉山人。

生十年，父洵游学四方，母程氏亲授以书，闻古今成败，辄能语其要。

程氏读东汉《范滂①传》，慨然太息，轼请曰：“轼若为滂，母许之否乎？”程氏曰：“汝能为滂，吾顾不能为滂母邪？”徙知徐州。

河决曹村，泛于梁山泊，溢于南清河。

汇于城下，涨不时泄。

城将败，富民争出避水。

轼曰：“富民若出，民心动摇，吾谁与守？吾在是，水决不能败城。

”驱使复入。

轼诣武卫营，呼卒长曰：“河将害城，事急矣，虽禁军且为我尽力。

”卒长曰：“太守犹不避涂潦②，吾侪③小人，当效命。

”率其徒持畚锸④以出。

筑东南长堤，首起戏马台，尾属于城。

雨日夜不止，城不沉者三板。

轼庐于其上，过家不入，使官吏分堵以守，卒全其城。

为木岸，以虞水之再至，朝廷从之。

（节选自《宋史•苏轼传》，有改动）【注】①范滂：东汉人，曾任汝阳太守属吏，因抑制豪强，反对宦官，33岁死于狱中。

其母深明大义。

②涂潦（láo）：泥水。

③吾侪（chái）：我们。

④锸（chā）：锹。

8．解释下列句中加点的词。

（2分）轼诣．武卫营（）9．下列句中加点字的意义和用法相同的一项是（）（2分）A、母程氏亲授以．书；以．君之力曾不能损魁父之丘（《愚公移山》）B、泛于．梁山泊；舜发于．畎亩之中（《孟子》）C、率其．徒持畚锸以出；不能名其．一处也（《口技》）D、朝廷从之．；悉以咨之．（《出师表》）10．用现代汉语写出文中画线句子的意思。

（4分）⑪轼若为滂，母许之否乎？⑫河将害城，事急矣，虽禁军且为我尽力。

11．下列叙述符合原文意思的一项是（）（2分）A、苏轼自幼受到良好的家庭教育，父亲苏询对他成为文学家影响最大。

B、洪水汇于城下的危急时刻，苏轼亲率士兵冒雨增筑城墙，保全了徐州城。

C、苏轼很小就树立起为民除弊兴利的大志，所以后来为官一任，造福一方。

D、苏轼任徐州太守时，动员富民出资修筑被洪水冲坏的城墙，受到朝廷嘉奖。

12．根据节选文字，结合已经学过的苏轼的诗文，你认为苏轼是个怎样的人？（2分）现代文阅读（共25分）（一）阅读《我的大学》，完成14—16题（共12分）我的大学①1979年9月，在田纳西州生活了6年的我，已经从一个懵懂少年变成一个对未来充满期望的青年。

初三初中九年级中考英语提升训练02-附参考答案

提升训练(二)[限时:30分钟得分: ]一、[2021·安徽]完形填空When I was young, I was so interested in Chinese movies that I wanted to know more about Chinese culture like kung fu and xiqu. I often 1 of going to China one day.Luckily, when I was learning theater at university, I was provided with a chance to study 2 . There was a program to study Asian theater arts either in China or in India. I 3 to go to China and learn Beijing Opera in a Chinese theater school. The school offered me a place to practice. It was good 4 I could practice whenever I wanted. Also I had 5 lesson—the teacher would give me one-to-one classes for three hours. That was the best part of my study in China. I do appreciate this chance to 6 the beautiful art!I got a lot from my study in China. It has greatly 7 me and helped me develop into a more skillful 8 . This Chinese art gives me plenty of 9 , so I can use them when I perform(表演) other shows in Europe. I have 10 an art center to teach Beijing Opera. Now there are more fans of Beijing Opera in my country.( )1.A chose B.managedC.forgotD.dreamed( )2.A.here B.insideC.abroadD.online( )3.A.failed B.decidedC.regrettedD.continued( )4.A.until B.thoughC.unlessD.because( )5.A.easy B.privateC.boringD.social( )6.A.learn B.expectC.testD.celebrate( )7.A.influenced B.troubledC.guardedD.controlled( )8.A.writer B.doctorC.actorD.pilot( )9.A.orders B.clothesC.toolsD.poems( )10.A.kept off B.broken intoC.pointed outD.set up二、阅读理解Did you know that some students don’t do their reading homework, not even short texts? There are many reasons for this. Students may be bored or not willing to give special attention. They may be unconfident readers. Whatever the reason, it has to stop today. Here’s why.Reading makes your mind active. It is like the exercise for your brain. When people get old, they become weaker and their strength leaves them. Exercise can prevent this loss. The same thing happens to people’s brains when they get older. Brain power and speed decline(衰退) with age. Reading can prevent these declines.You can get help from reading in the near future too. Reading provides knowledge. Knowledge is power. Therefore, reading can make you a more powerful person. You can learn to do new things by reading. Do you want to make video games? Do you want to design clothing? Reading can teach you all these and more. But you have to become good at reading, and the only way is to practice.Read everything that you can at school, whether you find it interesting or not. Reading adds to your vocabulary. Even a “boring” text can teach you new words. Having a larger vocabulary will help you better express yourself. You will be able to speak, write, and think more wisely. Do not just consider a text unimportant because you don’t know about it. Each time you read, you are provided with new ideas. Reading can change the way that you understand the world. It can give you a widerway of thinking. You can learn how people live in faraway places. You can learn about cultures different from your own.Reading is good for your feeling. It can reduce your stress and help you relax. You can get away from your troubles for a moment when you read. So, the next time you get reading homework, take as much as you can from it. Then move on to the next one.1.What is the main idea of Paragraph 2? ( )A.Reading is exciting and relaxing.B.Exercise keeps your body in shape.C.Reading prevents your mind declining.D.Age influences the body in many ways.2.Why does the writer think that you should read boring books? ( )A.You will make your teacher very happy.B.You will learn new words through reading.C.You will get better grades in the reading tests.D.You will finally love them if you read them through.3.What doesn’t the writer mention in the text? ( )A.Reading has a calming effect.B.Reading teaches you about cultures.C.Reading can make people feel relaxed.D.Reading helps you prepare for jobs.4.Which is the writer’s main purpose in writing this text? ( )A.He is teaching students how to become better readers.B.He is telling readers fun facts about the mind and body.C.He is trying to advise students to do their reading homework.D.He is explaining why students don’t do their reading homework.5.What is the best title for this text? ( )A.Reading: The Key to a Successful FutureB.Reading: Good for you in Many WaysC.Reading: Improve Your Vocabulary While Having FunD.Reading: The Best Way to Improve Your Writing Skills三、[2021·天津]任务型阅读A vegetarian(素食者) is someone who does not eat meat. Being a vegetarian has become a popular choice. In fact, 1 in every 200 kids in the US is a vegetarian. Most people choose to be vegetarians for many reasons.First, they believe that a vegetarian diet(饮食) is good for health. It usually has less fat(脂肪) than a diet that includes meat. Vegetarians eat a low-fat diet to stay fit and healthy. A vegetarian diet also provides many vitamins(维生素) that people can’t get from meat. These vitamins protect people from some diseases.Second, many vegetarians are worried about how animals are raised and killed for food. They hope animals can be better treated.Finally, they think being a vegetarian can help the planet. People use more energy, water and land to raise animals for food than to grow fruit and vegetables. Also animals put greenhouse gases(温室气体) into the air. These gases cause global warming(全球变暖).Vegetarians advise people to have just a couple of vegetarian meals a week to make the world a better place.1.In fact, 1 in in the US is a vegetarian.2.Vegetarians eat a low-fat diet to stay .3.Many vegetarians are worried about.4.People use to raise animals for food than to grow fruit and vegetables.5.Vegetarians advise people to a week.四、[2021·南京]综合填空根据短文内容及首字母提示,填写所缺单词,使短文意思完整。

初三初中九年级中考英语提升训练03-附参考答案

提升训练(三)[限时:30分钟得分: ]一、[2021·东丽区二模]完形填空Stuart didn’t get good grades, but he was a good student. He was curious about many things. And his 1 subject was science. He often talked to his science teacher, Mr. Anderson, 2 class. Stuart often played with his 3 , too. Sometimes he played games and other times he chatted with his friends. But he usually used his phone to learn. He liked to 4 the new words on his phone.Teachers didn’t allow students to take phones in class. Everyone knew that 5 . And students usually followed it. But sometimes teachers could catch students chatting or 6 games. Mr. Anderson usually told those students to put their phones 7 .But then the school 8 a new rule. It said, “If a student uses a phone, the teacher will take it away.”One day, Stuart was in 9 class. The day’s class was about the planets. Stuart wanted to check a fact. Stuart knew he shouldn’t use his phone. But he 10 wanted to find an answer to his question. He took out his phone. Then Mr. Anderson turned around. He saw Stuart using his phone, so he took Stuart’s phone away. ( )1.A.favourite B.specialC.successfulD.fantastic( )2.A.in B.aboutC.afterD.with( )puter B.phoneC.deskD.dictionary( )4.A.look for B.look atC.look likeD.look up( )5.A.rule B.wayC.mealD.diary( )6.A.having B.drawingC.playingD.joining( )7.A.away B.outC.offD.up( )8.A.refused B.grewC.madeD.held( )9.A.history B.mathsC.scienceD.English( )10.A.really B.nearlyC.suddenlyD.maybe二、[2021·泸州改编]阅读理解Boyan Slat has been dreaming of cleaning up the world’s oceans for a long time.In 2010, he went on a diving(潜水) vacation in Greece and was shocked. “I saw more plastic bags than fish in the water,” he said.From then on, Slat began to pay more attention to ocean pollution. He decided to give up higher education and set up the Ocean Clean-up, a non-government organization. Its purpose is to clean up ocean rubbish. He has set up the world’s first ocean clean-up system with his team.Every year, over 8 million tons of plastic end up in our oceans, and it can take up to 500 years to break down. In 2018, the World Economic Forum predicted(预言) that the weight of ocean plastic would match that of all the fish in our oceans by 2050. Sea animals easily get caught in plastic. They can’t move. They can even die if they eat it. Smaller plastic pieces can also enter the food chain(链) and end up in our bodies.Slat’s plan was to create an environmentally friendly, large system to clear out plastic rubbish from the ocean.After seven years of tests, on October 2nd, 2019, a machine called System 001/B came out. It successfully caught and collected a large amount of plastic rubbish floating in the ocean.Slat and his team are working to improve System 001/B. Their dream is to clearout 90 percent of all the ocean plastic by 2040.1.What did Boyan Slat care more about after his vacation in Greece? ( )A.Diving.B.Plastic bags.C.Ocean pollution.D.Higher education.2.It takes to break down 8 million tons of plastic. ( )A.more than 7 yearsB.up to 30 yearsC.less than 40 yearsD.about 500 years3.From the prediction of the World Economic Forum in 2018, we can learn .( )A.little pollution ends up in the oceanB.ocean plastic pollution is seriousC.animals prefer plasticD.people like seafood4.How did System 001/B work? ( )A.It collected much plastic rubbish floating in the ocean.B.It dealt with all the rubbish in the ocean.C.It cleared out rubbish everywhere.D.It cleared out 90% of the plastic.5.What’s the best title of the passage? ( )A.Animals and HumansB.Plastic ProblemsC.Life in the FutureD.Ocean Clean-up三、[2021·岳阳改编]任务型阅读Have you ever taken traditional Chinese medicine? Do you like its taste? Some people dislike it because of its bitter(苦的) taste, but more and more people are becoming interested in traditional Chinese medicine for the reason that it’s an effective way to cure(治疗) illnesses. For example, if you have a sore throat, you could drink hot water with Gancao.Chinese people have been using traditional Chinese medicine for centuries.Before the Western medicine appeared in China, Chinese doctors went to the mountains to pick herbs(草药). Then they made the herbs into Chinese medicine soup to cure patients. When we talk about Chinese medicine, we always think of Li Shizhen, one of the most famous doctors in ancient China. He used to travel in the countryside with a bag of herbs and cure patients. He spent 27 years writing The Compendium of Materia Medica(《本草纲目》).In 2020, COVID-19(新型冠状病毒肺炎) hit China and many other countries. Ever since then, traditional Chinese medicine has played an important role in the fight against COVID-19. It’s reported that 91.5% of the COVID-19 patients in China received the traditional Chinese medicine treatment(治疗), and it worked well on more than 90% of these patients. In August, 2020, Zhang Boli was honored as “the People’s Hero” for his contributions(贡献). Zhang shared the advantages of traditional Chinese medicine like Lianhua Qingwen with foreign doctors.In a word, traditional Chinese medicine is the treasure of China.1.Some people dislike traditional Chinese medicine because .2.In ancient China, doctors picked herbs in the mountains and made to cure patients.3.A famous Chinese doctor, , wrote The Compendium of Materia Medica.4.Zhang Boli was honored as “the People’s Hero” because of .5.The traditional Chinese medicine in the fight against COVID-19.四、综合填空根据短文内容及首字母提示,填写所缺单词,使短文意思完整。

人教版九年级英语Unit 4综合提升专练(含答案及解析)

人教版九年级Unit 4综合提升专练一、用所给词的适当形式填空1. We felt strange about his ( silent) at the party as he used to be very outgoing.2. What would you do if the teacher asked you to give a_______(speak) in front of the whole school?3. I think this dictionary is _______ (help) for your study.4. She was looking for me from room to room, but I kept _______(silence).5. “It was _______(exact) what I needed,” he said.二、单项选择1. Tom has just finished writing a _________ article.A. nine-hundred-wordsB. nine-hundreds-wordC. nine-hundred-wordD. nine-hundreds-words2. —How is your grandma?—She’s fine. She used to _____ TV at home after supper. But now she is used to _____ out for a walk.A. watch; goB. watching; goC. watching; goingD. watch; going3. In our school library there __________ a number of books on science and the number of them __________ growing larger and larger.A. is; areB. are; isC. has; isD. have; are4. My aunt _____________ my cousin because of his great progress in all subjects.A. takes an interest inB. takes pride inC. takes part inD. takes place5. She doesn't dare _______her teacher's eyes.A. meetB. meetingC. to meetD. meets6. He is so busy that he _______watching TV.A. sets outB. stays upC. keeps onD. gives up7. Li Ming’s father _______goes work on time because his home is far from there.A. seldomB. alwaysC. usuallyD. often8. －What’s your sister like?－_______A. She is 12 years oldB. She is tall and outgoing.C. She is in No. 1 Middle School.D. She likes making friends.9. I saw Jenny near the river on my way home.A. playsB. playingC. to playD. played10. Jay is one of_______ popular_______ young people in China.A. the; singer inB. the most; singers withC. the most; singer withD. the; singers with三、从方框中选择合适的短语填空A1. He _________________ his success.2. I’m thinking about how to ____________ the problem.3. He does not talk loudly or laugh loudly____________.4. I feel stressed out in my study __________________. I don’t know what to do.5. It’s too dark now, you must send away this friend of yours ______________.B6. England is one of _______ countries.7. Most kids are afraid of _____ alone. They want to be with their mothers.8. Linda _______ to wear glasses.9. —Where is Dr King?—He is giving a _______on space in the school.10. —How big are _______ elephants?—They are about 2.5 meters long and weigh about 600 kilos.四、根据对话内容，在每个空白处填写恰当的句子，使对话意思完整。

武钢三中初中英语九年级全册Unit 4提高练习(答案解析)

一、选择题1．-My father __________ to his workplace by bus, but now he __________there by bike.-Really? You have an environmentally-friendly father.A．used to go, is used to go B．used to going, is used to goC．is used to go, is used to going D．used to go, is used to going D解析：D【详解】句意：-----我父亲以前乘公共汽车去他的工作场所，但现在他习惯了骑自行车去那里。

------真的吗？你有一个爱环保的父亲。

考查固定短语。

1. used to do sth.：过去常常做某事，曾经做某事；2. be used to doing sth.：习惯于做某事；3. be used to do sth.：被用来做某事；结合句意可知填used to go, is used to going；选D。

2．—You’d better______smoking. It’s bad for your health.A．put up B．give upC．make up D．stay up B解析：B【详解】句意：-你最好放弃吸烟，它对你的健康是有害的。

put up张贴；搭建；give up放弃；make up编造，弥补；stay up熬夜。

根据句意It’s bad for your health可知，应该“放弃吸烟”，故应选B。

3．He used to________shy and________short hair when he was young.A．have; be B．be; have C．have; had B解析：B【详解】句意：他年轻的时候很害羞，留着短发。

中考初中科学九年级实验班提前招生集训卷—(物理4)

中考提前招生集训卷(物理4)1．A 、B 两物体叠放在水平桌面上，在如图所示的三种情况下：①甲图中两物体静置于桌面上：②乙图中水平恒力F 作用在B 物体上，使A 、B 一起以2m/s 的速度做匀速直线运动；③丙图中水平恒力F 作用在B 物体上，使A 、B 一起以10m/s 的速度做匀速直线运动。

比较上述三种情况下物体A 在水平方向的受力情况，以下说法正确的是( )A.三种情况下，A 在水平方向都不受力B.三种情况下，A 在水平方向都受力且受力相同C.①中A 在水平方向不受力，②、③中A 在水平方向都受力但受力不同D.①中A 在水平方向不受力，②、③中A 在水平方向都受力且受力相同2．在如图所示的电阻网格中，AB 、BC 、CD 、DA 四根电阻丝的阻值为r ，其余各电阻丝的阻值都相等，但阻值未知，测得AC 两点之间的总电阻为R ，若将AB 、BC 、CD 、DA 四根电阻丝皆换成阻值为2r 的电阻丝，则AC 两点之间的总电阻为( ) A.R r Rr -22B.R r Rr+22 C. R r Rr - D. Rr Rr +3．为了确保用电安全，家中都会安装配电盘。

配电盘中除了装有分别控制厨房、客厅和卧室等用电的开关外，还装有漏电保护器。

小明装完新房后，将插排插入客厅墙上的电源插孔中，然后将电视机的电源插头插入插排的电源插孔，但打开电视机后，配电盘中漏电保护中保护器就“跳闸”了。

小明拔下电视机电源插头，把漏电保护器的开关复原（重新闭合），然后将能正常使用的台灯插入该插排的电源插孔，闭合台灯开关后，漏电保护器再次“跳闸”。

关于发生上述现象的原因，下列猜想正确的是（）A ．墙上的电源插座中的火线和零线间短路了B ．插排中插座处的零线和火线接反了C ．插排中插座处的零线和火线接反了D ．插排中插座处的火线和地线接反了4．甲乙两物体在同一直线上向同一方向运动，t=0时刻同时经过同一位置，0～t 1时间内的位移-时间图像如图所示，关于在该段时间内甲乙两物体的运动，下列说法正确的是（） A.甲物体的速度先增大再减小B.甲物体的平均速度等于乙物体的平均速度B A B A B A v =2m/s丙FF 乙甲v =10m/sC.甲物体的速度始终大于乙物体的速度D.甲物体的路程大于乙物体的路程5. 如图所示，在水平力F作用下，木块A、B保持静止．若木块A与B的接触面是水平的，且F≠0.则关于木块B的受力个数可能是()A．4个或6个B．4个或5个C．3个或5个D．3个或4个6.如图所示，将两个相同的条形磁铁吸在一起，置于水平桌面上，下面说法正确的是( )A．B对桌面的压力的大小等于A、B的重力之和B．B对桌面的压力小于A、B的重力之和C．A对B的压力的大小等于A的重力D．A对B的压力大于A的重力7. 如图所示，质量为m1的木块在力F作用下，在质量为m2的长木板上向右滑行，而长木板处于静止状态，已知木块与木板间的动摩擦因数为μ1，木板与地面间的动摩擦因数为μ2，则() A．木板受到地面的摩擦力大小一定为μ1m1gB．木板受到地面的摩擦力一定是μ2(m1＋m2)gC．当F>μ2(m1＋m2)g时，木板便会开始滑动D．无论怎样改变F的大小，木板都不可能滑动8. 在粗糙水平地面上与墙平行放着一个截面为半圆的柱状物体A,A与竖直墙之间放一光滑圆球B,整个装置处于静止状态.现对B加一竖直向下的力F,F的作用线通过球心,设墙对B的作用力为F1,B 对A的压力为F2,地面对A的支持力为F3.若F缓慢增大而整个装置仍保持静止,截面如上图所示,在此过程中( )A.F1保持不变B.F2缓慢增大C. F3保持不变D.F3缓慢增大9.利用传感器和计算机可以研究力的大小变化情况，实验时让质量为m的某同学从桌子上跳下，自由下落H后双脚触地，他顺势弯曲双腿，其重心又下降了h，计算机显示该同学受到地面支持力F随时间变化的图象如图所示，根据图象提供的信息，以下判断不正确的是（）A．从0至t1时间内该同学处于失重状态B．在t1至t2时间内该同学处于超重状态C．t2时刻该同学加速度为零D ．在t 2到t 3时间内该同学的加速度在逐渐减小 10.如图所示，质量为50kg 的人通过光滑定滑轮的轻绳牵引质量为20kg 的物体，当绳与水平地面成53°角时，物体静止，求此时地面对人的支持力___________N 和摩擦力_____________N （g 取10m/s2，sin53°=0.8，cos53°=0.6）11. 热敏电阻常用于温度控制或过热保护装置中。

提高班资料3(调整)

九年级语文提高班第四次课堂练习资料一、字词积累﹙七年级上册﹚1. 痴想chī隐秘 yǐn mì凝成 níng 诱惑一瞬间shùn 大事渲染 xuàn rǎn 宣泄xiâ寒暄 xuān 水泄不通xiâ一泻千里xiâ喧腾2. 训诫耸立sǒng 迂回yū凝视níng 啜泣chuî qì啜茗chuî míng 纳罕nà hǎn 点缀zhuì瘦骨嶙峋lín xún 笔耕不辍chuî故弄玄虚头晕目眩 yūn xuàn 心惊肉跳小心翼翼3. 收敛 liǎn 宽恕卑微一丝不苟gǒu 聒聒guō guō4. 嚷rāng 穗suì绽放zhàn 沉淀diàn酝酿 niàng 迸溅bâng jiàn 挑逗tiǎo dîu 凑cîu 伫立zhù笼罩伶仃líng dīng 忍俊不禁jīn 仙露琼浆qiïng 蜂围蝶阵盘虬卧龙qiú浮想联翩piān 甘拜下风羁绊jī bàn挑衅tiǎo xìn 澎湃pãng pài5. 明察秋毫怡然自得yí庞然大物6 蜕变tuì倔强juã jiàng 洗濯zhuï玷污diàn扒窃pá qiâ诅咒zǔ zhîu 海天相吻碌碌终生lù绝处逢生可望不可即7. 贪婪lán 堕落duî点缀zhuì自豪冉冉rǎn苦熬áo 雏形chú丰硕shuî累累 lãi lãi 红灯绿酒沉甸甸diān 繁弦急管xián 玲珑剔透tī挑剔tiāo tī具体而微多姿多彩兴高采烈无精打采精彩五彩缤纷文采斐然fěi 不可磨灭回味无穷8. 慧心嬉戏慷慨障碍ài 撤销厄运â禀告bǐng 心旷神怡yí举世无双重峦叠嶂luán 行乞qǐ心痛如割险象迭生diã得失之患9. 鞭策报酬抱负奢望shē蹂躏rïu lìn呵责hē zã懊恼猝然长逝cù问心无愧陶冶yě斑斓bān lán揣摩chuǎi mï二、阅读理解清明的心弦①我喜欢北方的初冬，我喜欢初冬到郊外，到公园去游玩。

九上语文强化训练四

九上语文强化训练四不见杜甫不见李生久，佯狂真可哀！世人①皆欲杀，吾意独怜才。

敏捷诗千首，飘零酒一杯。

匡山②读书处，头白好归来。

【注释】这首诗写于客居成都初期，杜甫此时辗转得悉李白已在流放夜郎途中获释，遂有感而作。

①世人：指统治集团的人。

②匡山：李白少时读书的大匡山，在今四川北部。

1、结合具体诗句，分析诗中李白的形象。

（2 分）2、阅读全诗，品析作者在诗歌中所表达的思想感情。

（2 分）“不假思索”的肌肉记忆①我们都知道记忆的功能是由大脑完成的，然而鲜为人知的是，当人们需要记忆一些必须由身体参与的技能和运动时，除了通过大脑进行记忆之外，肌肉自身也会自觉启动记忆功能。

②肌肉记忆虽然听起来很陌生，但在生活中却相当常见。

用筷子、骑自行车、跳舞、做体操、演奏乐器等等，无一不需要肌肉记忆的配合。

就拿弹钢琴来说，有时候一首曲子弹到一半，突然想不起后面的谱子了，这时候无论你怎么绞尽脑汁地回忆，都没有任何进展。

但是，如果你能从头开始，再弹一遍曲子，很可能到卡壳的地方就自然而然地顺下去了，这就是你身体的肌肉记忆在起作用。

③再比如打羽毛球，所有人都可以用大脑记住一系列规则和技巧，但在实际操作中，一个没有经过训练的普通人可能和林丹打得一样好吗？④林丹之所以成为“超级丹”，不是因为他脑子里羽毛球理论记得比任何人都熟，而是因为他的肌肉在大量的练习中熟记了各种球的应对模式，能够在最短的时间内自动给出反应。

其实不难理解，当外界刺激出现时，如果完全要靠大脑支配身体肌肉，需要的时间较长，而肌肉依靠自身的记忆支配身体就要快得多了。

如果你恶作剧突然偷袭一位武木高手，即使这位高手是你的亲人，你也千万不要以为他会对你手下留情，因为身体的反应绝对要快过大脑，当他后悔时，你可能已经被打残了。

“不假思索”就是肌肉记忆的真实写照。

⑤事实上，肌肉记忆是一个循序渐进的过程，而这个过程和普通记忆一样，也起源于大脑。

当我们的身体学习某种新的技能时，大脑就会激活身体上所有需要配合的运动单元来帮助我们完成一系列的动作。

新华中学初中英语九年级全一册Starter Unit 4提高卷(提高培优)

考试范围：xxx；满分：***分；考试时间：100分钟；命题人：xxx 学校：__________ 姓名：__________ 班级：__________ 考号：__________一、选择题1．-My father __________ to his workplace by bus, but now he __________there by bike. -Really? You have an environmentally-friendly father.A．used to go, is used to go B．used to going, is used to goC．is used to go, is used to going D．used to go, is used to going 2．—Why are you standing there，Mingming？—Two tall boys are sitting________me，so I can’t see the blackboard clearly．A．behindB．next toC．in front ofD．beside3．—I didn’t watch the match last week. Can you tell me what happened?—Our team _________ during the last few minutes and _________the match .A．beat；won B．beat； missed C．scored；won D．scored；missed 4．Doctor Zhang, leader of the medical team of experts, _________ by CCTV last week. A．had interviewed B．was interviewed C．has interviewed D．is interviewed 5．It’s against the law for him to rush into ________ house without permission.A．my own private B．him own private C．his own private D．own his private 6．On National Day, nobody was in the school________the gate guarding.A．except B．except for C．include D．including7．I think your bike .A．requires to fix B．requires fixingC．requires be fixed D．requires fixed8．Switzerland is _______ country and it is very rich.A．a Europe B．an European C．a European D．Europe 9．Not only the father but also his children by smoking.A．influence B．influencesC．is influenced D．are influenced10．Daming has been absent _______ class for a week.A．for B．from C．in D．of11．Paul's a with a strong .He never asks others for advice on his business. A．personal; person; personality B．person;personal; personality C．personality; person; personal D．person; personality; personal 12．This kind of food is expensive. Please don’t buy food like it. A．much too; much too B．too much; too muchC．much too; too much D．too much; much too13．The president will give a report to the public on Sunday.A．in a person B．in personC．on a person D．on person14．— Yan Jiashuo, a ____________ girl, has won the prize of International Master of Memory.—Wow, she’s great, isn’t she?A．ten-year-old B．ten-years-old C．ten year olds D．ten years old 15．You can see the _____ in our faces when we talk about the great achievements in the past 70 years.A．doubt B．pride C．regret D．ability16．-Some students don't know how to___________ worries.-They can ask their teachers and parents for help.A．belong to B．deal with C．call in17．Mr. Liu _________ watches TV. He thinks watching TV is a waste of time.A．often B．seldom C．always D．usually18．Her daughter _________ juice，but now she _________ tea.A．used to drink；is used to drinking B．used to drinking；drinksC．is used to drinking；used to drink D．is used to drink；is drinking19．It’s said that the number of forest parks in Guang-dong __________ to more than 1,000 so far.A．increase B．have increased C．has increased D．increases20．I don't believe that this boy can paint such a nice picture.A．five years old B．five-years-oldC．five-year-old D．five year old21．A number of visitors _____ visiting the West Lake and the number of the visitors _____ increasing.A．are; is B．is; areC．are; are D．is ; is22．—Simon has been________ school for 2 days. What's wrong with him?—It's said that he has a cold.A．nervous about B．thirsty for C．absent from D．worried about 23．The reason why he was absent ____________the meeting was that his car broke down on the way.A．at B．from C．about24．Mr. Lee used to ____________dinner in the restaurant, but now he is used to____________every meal with his family at home.A．have; eating B．having; eat C．have; eat25．Great changes have taken place in Xiangyang. We are all ____________ the achievements. A．known as B．proud of C．similar to D．good with 26．People are usually to give a general in a job interview.A．required; self-introduction B．repaired; self-introduction C．remained; self-improvement【参考答案】一、选择题1．D2．C3．C4．B5．A6．A7．B8．C9．D10．B11．D12．C13．B14．A15．B16．B17．B18．A19．C20．C21．A22．C23．B24．A25．B26．A【参考解析】一、选择题1．D解析：D【详解】句意：-----我父亲以前乘公共汽车去他的工作场所，但现在他习惯了骑自行车去那里。