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2023届高三英语晚自习限时训练7

2023届高三英语晚自习限时训练7

高三英语限时训练一、阅读理解ARainforests are disappearing at a surprisingly fast speed, largely due to human development over the past few centuries. Once covering 14% of land on Earth, rainforests now make up only 6%. Since 1947, the total area of rainforests has probably been reduced by more than half, to about 6.2 to 7.8 million square kilometers.Many biologists expect rainforests will lose 5-10% of their species every ten years. Rapid deforestation could cause many important rainforest habitats to disappear completely in the next hundred years.Such rapid habitat loss is due to the fact that 100 acres of rainforest are cleared every minute for agricultural and industrial development. In the Pacific Northwest’s rainforests, logging companies cut down trees for wood used in building while paper industries use the wood for pulp. In the Amazon rainforest, large agricultural industries clear large parts of forests for growing crops. In the Congo rainforest, roads and other infrastructure (基础建设) development have reduced habitat and cut off living areas for many rainforest species. Throughout both the Amazon and Congo, logging operations clear-cut to build roads or for other purposes. Some rainforests are threatened by large hydroelectric power projects. Development is encroaching on rainforest habitats from all sides.Economic inequalities increase this rapid deforestation. Many rainforests are located in developing countries with economies based on natural resources. Wealthy nations drive need for products, and economic development increases energy use. These needs encourage local governments to develop rainforest at a slow speed. Poor people who live on or near these lands are also motivated to improve their lives by changing forests into farmland.1. What feeling does the author want to convey by listing figures?A.Frustrated. B.Disgusted. C.Inspired. D.Concerned.2. What caused the reduction of habitat for many rainforest species in Congo? A.The demand for numerous products.B.The motivation from local governments.C.The construction of fundamental facilities.D.The cooperation with developing countries.3. What does the underlined part “encroaching on” in paragraph 3 mean?A.Tearing up. B.Relying on. C.Holding back. D.Benefiting from.4. Which of the following can be the best title for the text?A.Changes of Rainforests B.Threats to Rainforests C.Comments on Rainforests D.Projects in RainforestsBAlexis, 17, sat quietly in the passenger seat of her dad’s car, looking out of the window. Then a deer came into view about 200 yards in front of them. “Dad, there’s a deer there!” Alexis said.As the car moved closer, Alexis heard a scream and saw an arm fly up near the deer’s head. Alexis reali zed the deer was attacking a woman. Sue, a 44-year-old mother, had been out for her morning run. The deer followed her and edged closer. “I knew I was in trouble,” Sue says. She went to pick up a stick for self-defense, and the deer charged. It lifted her with its antlers (鹿角) and threw her into the air. Sue could feel blood flowing down her leg.When Alexis and her father pulled up, the deer was throwing Sue like a doll. Alexis looked into the woman’s terrified eyes, and before her father had even stopped the car, the teenager jumped quickly out of the car and ran toward the deer. “I was kicking it to get its attention,” she says. Then her father, who had followed his daughter, tried to push the deer away from the women.Alexis helped Sue into the car, and then applied a piece of cloth to Sue’s injured leg. “We’re going to get you to a hospital,” Alexis said. Then she heard her father shout loudly. He had been knocked to the ground. Alexis took hold of a hammer from the car and ran to where her father lay on his back. She beat the deer’s head and neck, but the blows didn’t scare it away. “I was losing faith,” she says. “A couple more strikes, Alexis,” said her father. “You can do it.” Turning the hammer around, Alexis closed her eyes and beat the deer’s neck with all her strength. When she opened her eyes, the deer was running away. Alexis got in the driver’s seat and sped toward the nearest hospital.5. What was Sue doing when she was attacked by the deer?A.She was going to school. B.She was taking exercise.C.She was resting by the road. D.She was watering plants.6. What does the underlined word “edged” in paragraph 2 mean?A.Changed. B.Cut. C.Moved. D.Attacked.7. What did Alexis do to save her father and Sue?A.She pushed the deer away. B.She hit the deer with her feet. C.She drove the car to hit the deer. D.She beat the deer with a hammer.8. Which of the following words can best describe Alexis?A.Brave. B.Cruel. C.Energetic. D.Strong.CThis new packaging material looks like conventional plastic, but it’s actually made from fish waste and algae(海藻)—unlike plastic, if it escapes into the ocean, a fish could eat it safely. The material, called MarinaTex, is the winner of this year’s James Dyson Award.“It began with my desire to work with waste,” says Lu cy Hughes, a recent graduate from University of Sussex, who once visited a fish processing factory to see the massive quantity of waste generated by the industry and found new ways to use it. She focused on fish skins and scales(鳞片). “When I had it in my h ands, I realizedthis has got potential,” she says. “It s super strong and flexible.” Hughes spent months experimenting with fish waste in her kitchen, running more than 100 experiments to find a binder(粘合剂) and a process that could hold together theprote ins in the fish skins and scales.“I had a lot of failed attempts. A lot of things either were too easily broken or too soft or easily went bad,” she says. She finally found a type of algae that can be locally got.The material can be used to replace oil-based plastic in packaging such as bags or the half-transparent windows used to show products in boxes. As her research continues, Hughes says that she’ll be studying how MarinaTex works and how long it could be used to store food.Unlike some “composable” p lastics, which need to be processed in an industrial composting(堆肥) facility to break down, the new material can break down in four to six weeks in a backyard compost bin. “All the ingredients are food-grade safe,” Hughes says. “So, this breaks down much l ike a piece of food would break down.;9. Why did MarinaTex win this year s James Dyson Award?A.It doesn’t go into the ocean.B.It is environmentally-friendly.C.It doesn’t produce any waste.D.It doesn’t look like conventional plastic.;10. What is the main idea conveyed in paragraph 2?A.Where Hughes got inspiration for the binder.B.How Hughes developed MarinaTex.C.What advantages MarinaTex has.D.Where the binder can be used.;11. What is yet to be found out?A.How long it takes for MarinaTex to break down.B.How long MarinaTex can be used to store food.C.Whether MarinaTex can replace oil-based plastic.D.Whether MarinaTex is better than half-transparent windows.;12. Where is the text most likely to appear?A.In a science fiction. B.In a government report.C.In a science magazine. D.In a government announcement.二、完形填空As a community worker, I came into serious conflict with my community last week, and things completely fell apart between me and my community. As a result, I 13 to step away from them, blocked them on social media and did my best to 14 about them. However, the issues continued to 15 me, and even had a bad 16 on other areas of my life.Yesterday, I was 17 to see this community and held a 18 because of a major work event. I was still in fear of the issues and felt 19 when I first saw the people I 20 with. Despite all of this, the strangest but most 21 thinghappened to me. I felt something that I hadn’t felt in a long time, peace and forgiveness.At the meeting, there were no 22 or conflicts with anyone. It was 23 that a lot of people had 24 from the issues. I realized that there wasn’t anythingto worry about anymore. No one 25 bad will on me, and no one was holding anger against me anymore. There was peace, and room for people to forgive and move on.When you 26 others, you not only free them and find peace with them, but yourself as well. Now, I only wish them the best life that they can have, and the most 27 they could ever have. And then, I move on.13. A.pretended B.afforded C.decided D.refused14. A.forget B.argue C.inquire D.worry15. A.cheat B.bother C.alarm D.attack16. A.habit B.plan C.influence D.relationship17. A.designed B.supposed C.allowed D.forced18. A.record B.position C.meeting D.party19. A.ashamed B.disappointed C.excited D.embarrassed20. A.competed B.conflicted C.connected D.communicated21. A.wonderful B.sad C.awful D.careful22. A.movements B.achievements C.advertisements D.arguments23. A.impossible B.difficult C.obvious D.strange24. A.based on B.called on C.carried on D.moved on25. A.registered B.wished C.revised D.decorated26. A.represent B.forgive C.respect D.monitor27. A.happiness B.career C.resource D.pattern三、七选五阅读Camping is a fun and exciting experience, but to stay organized and safe, youmust carefully prepare for the trip.28 . If it is just you or your family, things will become easier. However, if you are taking a group of friends, you’d better make sure you get insurance information and health information before you start. If someone is injured on the trip, the insurance information will make a huge difference in the care they receive.29 . For example, for those who are suffering basic diseases, make sure they have enough medicines available.Then decide how long you will stay and figure out where you will be campin g. If you do not know this, you will go through the trouble of purchasing and packing atent when you were supposed to sleep in a cabin.30 . The food should be enough for three meals and an optional snack per day, as well as lots of water. Basically, ensure food safety. Foods like dairy products and meat go bad easily. 31 .At last, gather all of the other things on the “Things You’ll Need" list and try to pack them in a small, lightweight bag. 32 . Materials to deal with burns, cuts,and bumps should be prepared in it.A.Health information is also importantB.Stay calm when an accident happensC.Make sure they are fresh and safe to eatD.And never forget to pack up a first aid kitE.Firstly, decide with whom you are campingF.Taking exercise every day is a good way to keep healthyG.Of course, you’d better pack an appropriate amount of food四、语法填空阅读下面短文,在空白处填入1个适当的单词或括号内单词的正确形式。

7-限时规范训练

7-限时规范训练

7.语言表达简明、连贯、得体,准确、鲜明、生动1.参照下面的内容,用简明的文字叙说自己对父母威信的看法。

(50字以内)一位家长感慨:“唉,现在的孩子真不了起,知道的东西比我们还多,弄得我们这些做父母的常被他们瞧不起,更不要说什么威信了。

”答:________________________________________________________________________ ________________________________________________________________________答案知识爆炸,科学发展,父母在接受新事物新知识方面可能不及子女,这是社会进步使然,无损于父母的威信。

(或:家长的威信主要建立在社会、家庭的认可及他们的品行、能力等因素,并非由懂得多少来决定。

)2.根据文意排列下面句子的顺序,把正确句序的序号填入横线上。

有人说:世界上最难回答的问题往往是孩子提出的问题。

因为他们的问题是真正的心灵问题、哲学问题,_________________________________________________________________________________________________________________________________。

①哲学最终成了极少数对问题穷追不舍的人的专利②大人们往往回避问题,或只分析问题③于是,哲学思想便在这种环境中很快地夭折了④而孩子们的问题又往往把真理性问题一丝不挂地揪出来,让大人们很尴尬⑤而孩子们往往因为大人们没有给出答案而沮丧,放弃了对问题的追问答:____________________________________________________________________。

解析本题重点考查的是考生语言表达连贯的能力。

④句“而”相当于“而且”表并列,连接“他们的问题是真正的心灵问题、哲学问题”句。

2023年中考数学基础满分挑战训练四十分钟限时练习卷七含答案解析

2023年中考数学基础满分挑战训练四十分钟限时练习卷七含答案解析

40分钟限时练习(7)一.选择题(共8小题,满分24分,每小题3分)1.(3分)下列变形正确的是( )A.(﹣3a3)2=﹣9a5B.2x2y﹣2xy2=0C.―3ba÷2ab=―32a2D.(2x+y)(x﹣2y)=2x2﹣2y2【分析】原式各项计算得到结果,即可作出判断.【解答】解:A、原式=9a6,错误;B、原式不能合并,错误;C、原式=―32a2,正确;D、原式=2x2﹣4xy+xy﹣2y2=2x2﹣3xy﹣2y2,错误.故选:C.【点评】此题考查了分式的乘除法,合并同类项,幂的乘方与积的乘方,以及平方差公式,熟练掌握公式及运算法则是解本题的关键.2.(3分)如图所示的几何体由一个圆柱体和一个长方体组成,从上面看该几何体得到的平面图形是( )A.B.C.D.【分析】根据圆柱体和长方体的俯视图解答.【解答】解:圆柱体的俯视图是圆,长方体的俯视图是长方形,所以,组合图形为长方形内有一个圆的图形.故选:C.【点评】本题考查了画几何体的三视图;用到的知识点为:主视图,左视图与俯视图分别是从物体的正面,左面,上面看得到的图形.3.(3分)如果点P(﹣2,b)在直线y=2x﹣l上,那么下列正确的是( )A.b的值为5B.点P关于y轴的对称点Q的坐标为(2,﹣5)C.点P到x轴的距离为2D.点P关于原点的对称点M的坐标为(5,2)【分析】根据点P(﹣2,b)在直线y=2x﹣l上,可得点P的坐标为(﹣2,﹣5),再根据关于x、y轴对称的点的坐标、关于原点对称的点的坐标特征即可判断.【解答】解:∵点P(﹣2,b)在直线y=2x﹣l上,∴当x=﹣2时,b=﹣5,所以A选项错误;∵点P坐标为(﹣2,﹣5),∴点P关于y轴的对称点Q的坐标为(2,﹣5),所以B选项正确;点P到x轴的距离为5,所以C选项错误;点P关于原点的对称点M的坐标为(2,5),所以D选项错误.故选:B.【点评】本题考查了一次函数图象上点的坐标特征、关于x、y轴对称的点的坐标、关于原点对称的点的坐标,解决本题的关键是掌握一次函数的性质.4.(3分)如图,直线l1∥l2,直线AD与l1,l2分别相交于点B,C,图中三个角∠α,∠β,∠γ之间的关系,下列式子中表述正确的是( )A.γ=2α+βB.γ=α+2βC.γ=α+βD.γ=α+β﹣180°【分析】根据平行线的性质得到∠ACE=α,根据平角的定义得到∠CED=180°﹣β,再根据三角形外角的性质即可求解.【解答】解:∵l1∥l2,∴∠ACE=α,∵∠CED=180°﹣β,∴α=180°﹣β+γ,即γ=α+β﹣180°.故选:D.【点评】本题考查了平行线的性质,三角形外角的性质,关键是得到∠ACE=α,∠CED =180°﹣β.5.(3分)如图所示的图形,长方形纸片沿AE折叠后,点D与D′重合,且已知∠CED′=50°.则∠AED是( )A.60°B.50°C.75°D.65°【分析】利用折叠的性质得到∠DEA与∠D′EA的关系,再利用角的和差关系及平角的定义求出∠DEA.【解答】解:∵△ED′A是△EDA折叠成的,∴∠DEA=∠D′EA.∵∠DEA+∠D′EA+CED′=180°.∴2∠DEA=180°﹣50°=130°.∴∠DEA=65°.故选:D.【点评】本题主要考查了折叠的性质,掌握折叠后的两个图形全等及平角的定义是解决本题的关键.6.(3分)一次函数y=x+1的图象如图所示,下列说法正确的是( )A.y的值随着x的增大而减小B.函数图象经过第二、三、四象限C.函数图象与y轴的交点坐标为(1,0)D.y=x+1的图象可由y=x的图象向上平移1个单位长度得到【分析】根据画出函数的图象性质、一次函数图象上点的坐标特征以及平移的规律进行判断即可.【解答】解:A、一次函数y=x+1中,k=1>0,所以y随x的增大而增大,故错误;B、由图象可知,函数图象经过一、二、三象限,故错误;C、令x=0,则y=1,所以直线与y轴的交点为(0,1),故错误;D、根据平移的规律,把直线y=x向上平移1个单位得到直线y=x+1,故正确.故选:D.【点评】本题主要考查了一次函数的图象和性质,要掌握它的性质和平移的规律才能灵活解题.7.(3分)如图,在矩形ABCD中,AB=3,AD=4,点P在AD上,PE⊥AC于E,PF⊥BD于F,则PE+PF等于( )A.75B.125C.135D.145【分析】连接OP,过D作DM⊥AC于M,求出AC长,根据三角形的面积公式求出CM 的值,根据S△AOD=S△APO+S△DPO代入求出PE+PF=DM即可.【解答】解:连接OP,过D作DM⊥AC于M,∵四边形ABCD是矩形,∴AO=OC=12AC,OD=OB=12BD,AC=BD,∠ADC=90°∴OA=OD,由勾股定理得:AC=32+42=5,∵S△ADC=12×3×4=12×5×DM,∴DM=12 5,∵S△AOD=S△APO+S△DPO,∴12(AO×DM)=12(AO×PE)+12(DO×PF),即PE+PF=DM=12 5,故选:B.【点评】本题考查了矩形的性质、三角形的面积公式、勾股定理的应用,关键是求出PE+PF =DM.8.(3分)如图,在⊙O中半径OC与弦AB垂直于点D,且AB=16,OC=10,则CD的长是( )A.2B.3C.4D.5【分析】根据垂径定理以及勾股定理即可求答案.【解答】解:连接OA,设CD=x,∵OA=OC=10,∴OD=10﹣x,∵OC⊥AB,∴由垂径定理可知:AB=16,由勾股定理可知:102=82+(10﹣x)2,∴x=4,∴CD=4,故选:C.【点评】本题考查垂径定理,解题的关键是熟练运用垂径定理以及勾股定理,本题属于基础题型.二.填空题(共8小题,满分32分,每小题4分)9.(4分)已知23的整数部分为a,小数部分为b,则a﹣b= 8―23 .【分析】由4<23<5,可求出a=4,b=23―4,再将a、b的值代入所求式子即可.【解答】解:∵16<23<25,∴4<23<5,∴a=4,b=23―4,∴a﹣b=4﹣(23―4)=8―23.故答案为:8―23.【点评】本题考查估计无理数的大小;熟练掌握无理数的整数部分与小数部分的求法是解题的关键.10.(4分)当x = ﹣4 时,分式x 2―162x ―8的值为0.【分析】根据分式的值为零的条件:分子等于0,且分母不等于0即可得出答案.【解答】解:根据题意得x 2﹣16=0,2x ﹣8≠0,∴x =±4,x ≠4,∴x =﹣4,故答案为:﹣4.【点评】本题考查了分式的值为零的条件,掌握分式的值为零的条件:分子等于0,且分母不等于0是解题的关键.11.(4分)将4个数a 、b 、c 、d 排成2行、2列,两边各加一条竖直线记成|a b c d |,这个记号叫做2阶行列式.定义|a b c d |=ad ―bc ,若|x +1x ―11―x x +1|=6,则x = ±2 .【分析】理解题意,按新定义|a b c d |=ad ―bc ,将问题转化为方程.若|x +1x ―11―x x +1|=6,即(x +1)(x +1)﹣(x ﹣1)(1﹣x )=6,再解方程即可.【解答】解:由题意,得:(x +1)(x +1)﹣(x ﹣1)(1﹣x )=6,∴x 2+2x +1+x 2﹣2x +1=6,∴2x 2+2=6,∴x =±2.【点评】本题是考查接受新定义能力的题目,解答的关键是理解题意,将问题转化为解一元二次方程.12.(4分)M 是△ABC 的边BC 的中点,AN 平分∠BAC ,BN ⊥AN 于点N ,且AB =10,BC =15,MN =3,则△ABC 的周长等于 41 .【分析】延长线段BN 交AC 于E ,易证△ABN ≌△AEN ,可得N 为BE 的中点;由已知M 是BC 的中点,可得MN 是△BCE 的中位线,由中位线定理可得CE 的长,根据AC =AE +CE 可得AC 的长,进而得出△ABC 的周长.【解答】解:延长线段BN 交AC 于E .∵AN 平分∠BAC ,∴∠BAN =∠EAN ,又∵AN=AN,∠ANB=∠ANE=90°,∴△ABN≌△AEN,∴AE=AB=10,BN=NE,又∵M是△ABC的边BC的中点,∴CE=2MN=2×3=6,∴△ABC的周长是AB+BC+AC=10+15+10+6=41.故答案为41.【点评】本题主要考查了中位线定理和全等三角形的判定及性质.解决本题的关键是作出辅助线,利用全等三角形得出线段相等,进而应用中位线定理解决问题.13.(4分)反比例函数y=k1x与正比例函数y=k2x图象的一个交点为第三象限内一点(﹣2,m).则不等式k1x>k2x的解集为 x<﹣2或0<x<2 .【分析】根据函数的对称性可得另一个交点在第一象限,其坐标为(2,﹣m),再根据两个函数的交点坐标以及图象的性质得出答案.【解答】解:由两个函数的对称性可得,反比例函数y=k1x与正比例函数y=k2x图象的另一个交点在第三象限,坐标为(2,﹣m),当反比例函数大于正比例函数值时,自变量x的取值范围为x<﹣2或0<x<2,故答案为:x<﹣2或0<x<2.【点评】本题考查一次函数与反比例函数的交点,理解正比例函数与反比例函数的性质是正确判断的前提.14.(4分)如图所示,正比例函数y=k1x与反比例函数y=k2x的图象有一个交点(2,﹣1),则这两个函数图象的另一个交点坐标是 (﹣2,1) .【分析】反比例函数的图象是中心对称图形,则与经过原点的直线的两个交点一定关于原点对称.【解答】解:由图象可知:直线y=k1x经过原点与双曲线y=k2x相交于两点,又由于双曲线y=k2x与直线y=mx均关于原点对称.则两点关于原点对称,一个交点的坐标为(2,﹣1),则另一个交点的坐标为(﹣2,1).故答案为:(﹣2,1).【点评】本题考查反比例函数图象的中心对称性,即两点关于原点对称.15.(4分)如图,点O为正八边形ABCDEFGH的中心,则∠ADB= 22.5 度.【分析】求出∠AOB=45°,根据同弧所对的圆心角和圆周角的关系即可得到结论.【解答】解:如图,连接OA,OB,∵∠AOB=3608=45°,∴∠ADB=12∠AOB=22.5°,故答案为:22.5.【点评】本题考查正多边形与圆,同弧所对的圆心角和圆周角的关系,解题的关键是掌握圆周角定理,学会添加常用辅助线.16.(4分)如图,正方形ABCD的边长为2,点E是AB边上一个动点,点F是CD边上一个动点,且AE=CF,过点B作BG⊥EF于点G,连接AG,则AG长的最小值是 10 2―22 .【分析】设正方形的中心为O ,可证EF 经过O 点.连接OB ,取OB 中点M ,连接MA ,MG ,则MA ,MG 为定长,利用两点之间线段最短解决问题即可.【解答】解:设正方形的中心为O ,可证EF 经过O 点.连接OB ,取OB 中点M ,连接 MA ,MG ,则MA ,MG 为定长,过点M 作MH ⊥AB于H .则MH =BH =12,AH =32,由勾股定理可得MA =102,MG =12OB =22,∵AG ≥AM ﹣MG =102―22,当A ,M ,G 三点共线时,AG 最小=102―22,故答案为:102―22.【点评】本题主要考查了正方形的性质,解直角三角形,直角三角形斜边中线的性质等知识,解题的关键是求出AM ,MG 的值.三.解答题(共4小题,满分44分)17.(10分)(1)―83×254÷765;(2)(3―1×27+24―623)×12―(32―6)2.【分析】(1)先根据二次根式的乘法和除法法则运算,然后化简即可;(2)先根据负整数指数幂的意义计算,再把二次根式化为最简二次根式,然后根据二次根式的乘法法则和完全平方公式计算.【解答】解:(1)原式=―13×2×17×8×54×56=―221×2×3×2×5=―410 7;(2)原式=(13×33+26―26)×23―(18﹣123+6)=3×23―24+123=6﹣24+123=123―18.【点评】本题考查了二次根式的混合运算,熟练掌握二次根式的性质、二次根式的乘法和除法法则和负整数指数幂是解决问题的关键.18.(10分)解方程:(1)10x=3x+7;(2)1x+3―23―x=12x2―9.【分析】(1)通过去分母、去括号、移项、x的系数化为1解分式方程.(2)先对分式方程的分母进行因式分解,确定最简公分母,再通过去分母、去括号、移项、合并同类项、x的系数化为1解这个分式方程.【解答】解:(1)10x=3x+7,两边同乘x(x+7),得10(x+7)=3x.去括号,得10x+70=3x.移项,得7x=﹣70.x的系数化为1,得x=﹣10.当x=﹣10时,x(x+7)≠0.∴这个分式方程的解为x=﹣10.(2)∵1x+3―23―x=12x2―9,∴1x+3―23―x=12(x+3)(x―3).方程两边同乘(x+3)(x﹣3),得x﹣3+2(x+3)=12.去括号,得x﹣3+2x+6=12.移项,得x+2x=12﹣6+3.合并同类项,得3x=9.x的系数化为1,得x=3.当x=3时,(x+3)(x﹣3)=0.∴x=3是这个分式方程的增根.∴这个分式方程无解.【点评】本题主要考查解分式方程,熟练掌握解分式方程的方法是解决本题的关键.19.(12分)疫情期间,学生居家学习,考虑学生们的健康成长,A市教育局依据国家“五项管理”和“双减政策”,提出了“每天锻炼一小时,健康生活一辈子”活动口号.为了解A市九年级学生参加体育锻炼的情况,随机抽查了A市部分九年级学生半个月参加体育锻炼(每天锻炼时间超过1小时)的天数,并用得到的数据绘制了两幅不完整的统计图(如图),请根据图中提供的信息,回答下列问题:(1)a= 10 .并写出该扇形所对圆心角的度数为 36 °.请补全条形图.(2)在这次抽样调查中,众数和中位数分别是多少?(3)如果A市共有九年级学生4000人,请你估计半个月来A市九年级学生“活动时间不少于6天”的学生人数大约有多少人?【分析】(1)根据各部分所占的百分比的和等于1列式计算即可求出a,用360°乘a即可得出其扇形的圆心角度数;然后用被抽查的学生人数乘以8天所占百分比求出8天的人数,补全条形统计图即可;(2)用众数和中位数的定义解答;(3)用总人数乘以“活动时间不少于6天”的百分比,计算即可得解.【解答】解:(1)a%=1﹣(40%+20%+25%+5%)=1﹣90%=10%,故a=10,该扇形所对圆心角的度数为:360°×10%=36°;被抽查的学生人数:240÷40%=600人,8天的人数:600×10%=60人,补全统计图如图所示:故答案为:10;36;(2)参加社会实践活动5天的人数最多,所以,众数是5天,600人中,按照参加社会实践活动的天数从少到多排列,第300人和301人都是6天,所以,中位数是6天;(3)4000×(20%+25%+10%+5%)=2400(人).故“活动时间不少于6天”的学生人数大约有2400人.【点评】本题考查的是条形统计图和扇形统计图的综合运用,读懂统计图,从不同的统计图中得到必要的信息是解决问题的关键.条形统计图能清楚地表示出每个项目的数据;扇形统计图直接反映部分占总体的百分比大小.20.(12分)如图所示,已知AC=AE,AB=AD,∠1=∠2,(I)试证明:∠B=∠D;(2)若∠1=90°时,直线BC、DE的位置怎样?【分析】(1)先证∠EAD=∠CAB,再利用SAS证明△EAD≌△CAB,根据全等三角形对应角相等即可;(2)由(1)结论△EAD≌△CAB得∠B=∠D,再由∠B+∠BGA=90°,根据等量代换得∠D+∠DGH=90°,故可判断DE⊥BC.【解答】(1)证明:∵∠1=∠2,∴∠EAD=∠CAB,在△EAD和△CAB中,AC=AE,∠EAD=∠CAB,AB=AD∴△EAD≌△CAB(SAS),∴∠B=∠D.(2)解:直线BC、DE相互垂直.理由如下:由(1)可知△EAD≌△CAB,∴∠B=∠D,∵∠1=∠2=90°,∴∠B+∠BGA=90°,∴∠CGB+∠D=90°,∴∠BHD=90°,∴BC与DE相互垂直.【点评】本题主要考查三角形全等的判定和性质.利用SAS找对应的相等边和角是关键.。

英语限时训练(七)

英语限时训练(七)

限时训练(七)Ⅰ.单项填空1.As teachers we shouldn’t accept the argument given by some people standardized tests restrict educators too much and take the joy out of teaching.A.whereB.whatC.howD.that答案 D解析考查连接词。

句意为:作为教师,我们不应该接受一些人的论点,即标准化考试对教育工作者限制太多,使教学失去了乐趣。

分析句子可知,本句为名词argument的同位语从句,从句的句意完整且句子不缺少主要成分,所以连接词选that。

故D选项正确。

2.If she as generous as she makes out,she would have donated more money in the catastrophe.A.had beenB.wereC.would beD.was答案 B解析考查虚拟语气。

从句首的if与主句的would have done可判断为虚拟语气,并且根据句意及语境可以判断是与现在事实相反的假设,所以if从句用一般过去时,be动词要用were。

故选B。

3.I’d never wondered before whether or not he was kid-friendly.With one glance,I quickly that he probably wasn’t.A.agreedB.reportedC.explainedD.decided答案 D解析考查动词词义辨析。

句意为:我从没有问过他是不是招孩子喜欢,但是乍一眼看到他,我觉得他并不是招孩子喜欢的那种类型。

agree同意;report报告;explain解释;decide决定,明确。

表示做出判断用decide,故选D。

4.With the number of homecoming overseas students up in recent years,the attraction of foreign degree holders has gradually faded.A.shotB.being shotC.shootingD.to shoot答案 C解析考查非谓语动词。

高中物理精品试题:高二物理限时训练(7)

高中物理精品试题:高二物理限时训练(7)

凤鸣高中高二物理限时训练(7)第I 卷(选择题)一、单选题1.城市进入高楼时代后,高空坠物已成为危害极大的社会安全问题。

图为一则安全警示广告,非常形象地描述了高空坠物对人伤害的严重性。

小明同学用下面的实例来检验广告词的科学性:设一个50 g 鸡蛋从25楼的窗户自由落下,与地面的碰撞时间约为3210s -⨯,已知相邻楼层的高度差约为3 m ,则该鸡蛋对地面产生的冲击力约为( )A .10 NB .102NC .103ND .104 N2.2017年4月20日19时41分,中国文昌航天发射场,我国目前发射的体积最大、重量最重的航天器天舟一号货运飞船乘坐长征七号运载火箭升上太空,进行我国空间站货物运输系统的首次飞行试验。

假设长征七号运载火箭搭载着卫星以速率v 0进入太空预定位置,由控制系统使箭体与天舟一号货运飞船分离。

已知前部分的天舟一号货运飞船质量为m 1,后部分的箭体质量为m 2,分离后箭体以速率v 2沿火箭原方向飞行,若忽略空气阻力及分离前后系统质量的变化,则分离后天舟一号货运飞船的速率v 1为( )A .v 0-v 2B .v 0+v 2C .v 0-21m m v 2D .v 0+21m m (v 0-v 2) 3.在光滑水平地面上放置一辆小车,车上放置有木盆,在车与木盆以共同的速度向右运动时,有雨滴以极小的速度竖直落入木盆中而不溅出,如图所示,则在雨滴落入木盆的过程中,小车速度将( )A .保持不变B .变大C .变小D .不能确定4.以下说法正确的是( )A .单摆的周期公式是由伽利略研究并确定的B .根据多普勒效应可知:当观察者与波源相互靠近时,接收到频率会变小C .托马斯·杨利用光的双缝干涉实验,有力的证明了光是一种波D .物体做受迫振动达到稳定后,物体振动的频率等于物体的固有频率5.如图甲所示, 弹簧振子以 O 点为平衡位置, 在AB 、两点之间做简谐运动,取A 到 B 为正方向,振子的位移 x 随 时间 t 的变化如图C 所示,下列说法正确的是( )A .0.2s t = 时, 振子在 O 点右侧 6cm 处B .0.4s t = 和 1.2s t = 时,振子的加速度完全相同C .0.8s t = 时, 振子的速度方向为负方向D .0.4s t = 到 0.8s t = 的时间内, 振子的速度逐渐减小6.某波源S 发出一列简谐横波,波源S 的振动图像如图所示。

高三数学上学期限时训练试题7理高补班 试题

高三数学上学期限时训练试题7理高补班 试题

实验2021届高三数学上学期限时训练试题〔7〕理〔高补班〕考试时间是是2021年10月28日11:20-12:00〔使用班级:理2-理16〕 一.选择题〔本大题一一共12小题,每一小题5分,一共60分〕 1.集合U =R ,A ={x |x 2-x -2<0},B ={x |y =ln(1-x )},那么图中阴影局部所表示的集合是( ) A.{x |x ≥1}B.{x |1≤x <2}C.{x |0<x ≤1}D.{x |x ≤1}2.“a =0”是“函数f (x )=sin x -1x+a 为奇函数〞的( )A.充分不必要条件B.必要不充分条件C.充要条件D.既不充分也不必要条件3.函数f(x)=(a∈R),假设函数f(x)在R 上有两个零点,那么a 的取值范围是( ) A.(-∞,-1)B.(-∞,1)C.(-1,0)D.[-1,0)4.a ,b >0且a ≠1,b ≠1,假设log a b >1,那么( ) A.(a -1)(b -1)<0 B.(a -1)(a -b )>0 C.(b -1)(b -a )<0 D.(b -1)(b -a )>05.函数f (x )=⎝⎛⎭⎪⎫x -1x cos x (-π≤x ≤π且x ≠0)的图象可能为( )6.假设函数f(x)=sin(2x+θ)+cos(2x+θ)(0<θ<π)的图象关于点对称,那么函数f(x)在上的最小值是( )A.-1B.-C.-7.在△ABC 中,三个内角A ,B ,C 所对的边分别为a ,b ,c ,假设S △ABC =23,a +b =6,a cos B +b cos Ac=2cos C ,那么c =( )7B.4 3 38.菱形ABCD 的边长为a ,∠ABC =60°,那么BD →·CD →等于( ) A.-32a 2B.-34a 2C.34a 2D.32a 2 9.等差数列{a n }和等比数列{b n }的首项均为1,公差与公比均为3,那么++=( ) A.64 B.3210.设等差数列{a n }的公差是d ,其前n 项和是S n ,假设a 1=d =1,那么S n +8a n的最小值是( ) A.92B.72 2+122-1211.假设函数f (x )=x -13sin 2x +a sin x 在(-∞,+∞)上单调递增,那么a 的取值范围是( ) A.[-1,1]B.⎣⎢⎡⎦⎥⎤-1,13C.⎣⎢⎡⎦⎥⎤-13,13 D.⎣⎢⎡⎦⎥⎤-1,-1312.设α,β∈[0,π],且满足sin αcos β-cos αsin β=1,那么sin(2α-β)+sin(α-2β)的取值范围为( ) A.[-2,1] B.[-1,2] C.[-1,1] D.[1,2]二.填空题〔本小题一共4小题,每一小题5分,一共20分〕13.命题p :∃x ∈R ,(m +1)(x 2+1)≤0,命题q :∀x ∈R ,x 2+mxp ∧q 为假命题,那么实数m 的取值范围为________14.在△ABC 中,B =π4,BC 边上的高等于13BC ,那么cos A =______15函数f (x )=ax 3-3x 2+1,假设f (x )存在唯一的零点x 0,且x 0>0,那么实数a 的取值范围是_______16.在数列{a n }中,a n +1+(-1)na n =2n -1,那么数列{a n }的前12项和等于______高补部理科数学 限时训练〔7〕答题卡〔9.28〕班别 : 座号: 姓名 : 得分:13 14 15 16一.选择题〔本大题一一共12小题,每一小题5分,一共60分〕 1.集合U =R ,A ={x |x 2-x -2<0},B ={x |y =ln(1-x )},那么图中阴影局部所表示的集合是( ) A.{x |x ≥1}B.{x |1≤x <2}C.{x |0<x ≤1}D.{x |x ≤1}解析 易知A =(-1,2),B =(-∞,1),∴∁U B =[1,+∞),A ∩(∁U B )=[1,2).因此阴影局部表示的集合为A ∩(∁U B )={x |1≤x <2}.答案 B 2.“a =0”是“函数f (x )=sin x -1x+a 为奇函数〞的( )A.充分不必要条件B.必要不充分条件C.充要条件D.既不充分也不必要条件解析 显然a =0时,f (x )=sin x -1x为奇函数;当f (x )为奇函数时,f (-x )+f (xf (-x )+f (x )=sin(-x )-1-x +a +sin x -1x+a =0.因此2a =0,故a =0.所以“a =0〞是“函数f (x )为奇函数〞的充要条件.答案 C3函数f(x)=(a∈R),假设函数f(x)在R 上有两个零点,那么a 的取值范围是( ) A.(-∞,-1) B.(-∞,1) C.(-1,0)D.[-1,0)4.a ,b >0且a ≠1,b ≠1,假设log a b >1,那么( )A.(a -1)(b -1)<0B.(a -1)(a -b )>0C.(b -1)(b -a )<0D.(b -1)(b -a )>0 解析 ∵a >0,b >0且a ≠1,b ≠1. 由log a b >1得log a b a>0.∴a >1,且b a >1或者0<a <1且0<b a<1,那么b >a >1或者0<b <a <1.故(b -a )(b -1)>0.答案 D5.函数f (x )=⎝⎛⎭⎪⎫x -1x cos x (-π≤x ≤π且x ≠0)的图象可能为( )解析 (1)因为f (-x )=⎝ ⎛⎭⎪⎫-x +1x cos(-x )=-⎝ ⎛⎭⎪⎫x -1x cos x =-f (x ),-π≤x ≤π且x ≠0,所以函数f (x )为奇函数,排除A ,B.当x =π时,f (x )=⎝⎛⎭⎪⎫π-1πcos π<0,排除C ,应选D.答案 D7.在△ABC 中,三个内角A ,B ,C 所对的边分别为a ,b ,c ,假设S △ABC =23,a +b =6,a cos B +b cos Ac=2cos C ,那么c =( )7 B.4 3 3解析 ∵a cos B +b cos Ac=2cos C ,由正弦定理,得sin A cos B +cos A sin B =2sin C cos C , ∴sin(A +B )=sin C =2sin C cos C ,由于0<C <π,sin C ≠0,∴cos C =12,∴C =π3,∵S △ABC =23=12ab sin C =34ab ,∴ab =8,又a +b =6,解得⎩⎪⎨⎪⎧a =2,b =4或者⎩⎪⎨⎪⎧a =4,b =2,c 2=a 2+b 2-2ab cos C =4+16-8=12,∴c =23,应选C.答案 C8.菱形ABCD 的边长为a ,∠ABC =60°,那么BD →·CD →等于( ) A.-32a 2B.-34a 2C.34a 2D.32a 2 解析 在菱形ABCD 中,BA →=CD →,BD →=BA →+BC →,所以BD →·CD →=(BA →+BC →)·CD →=BA →·CD →+BC →·CD →=a 2+a ×a ×cos 60°=a 2+12a 2=32a 2.答案 D10.设等差数列{a n }的公差是d ,其前n 项和是S n ,假设a 1=d =1,那么S n +8a n的最小值是( ) A.92B.72 2+122-12解析 易知a n =a 1+(n -1)d =n ,S n =n 〔n +1〕2.∴S n +8a n=n 〔n +1〕2+8n=12⎝ ⎛⎭⎪⎫n +16n +1≥12⎝⎛⎭⎪⎫2n ·16n +1=92,当且仅当n =4时取等号,因此S n +8a n 的最小值为92. 11.假设函数f (x )=x -13sin 2x +a sin x 在(-∞,+∞)上单调递增,那么a 的取值范围是( ) A.[-1,1]B.⎣⎢⎡⎦⎥⎤-1,13C.⎣⎢⎡⎦⎥⎤-13,13 D.⎣⎢⎡⎦⎥⎤-1,-13解析 ∵f (x )=x -13sin 2x +a sin x ,∴f ′(x )=1-23cos 2x +a cos x =-43cos 2x +a cos x +53.由f (x )在R 上单调递增,那么f ′(x )≥0在R 上恒成立.令t =cos x ,t ∈[-1,1],那么-43t 2+at +53≥0,在t ∈[-1,1]上恒成立.∴4t 2-3at -5≤0在t ∈[-1,1g (t )=4t 2-3at -5,那么⎩⎪⎨⎪⎧g 〔1〕=-3a -1≤0,g 〔-1〕=3a -1≤0.解之得-13≤a ≤13.答案 C12.设α,β∈[0,π],且满足sin αcos β-cos αsin β=1,那么sin(2α-β)+sin(α-2β)的取值范围为( ) A.[-2,1]B.[-1,2]C.[-1,1]D.[1,2]解析 ∵sin αcos β-cos αsin β=1,∴sin(α-β)=1,∵α,β∈[0,π],∴α-β=π2,由⎩⎪⎨⎪⎧0≤α≤π,0≤β=α-π2≤π⇒π2≤α≤π, ∴sin(2α-β)+sin(α-2β)=sin ⎝⎛⎭⎪⎫2α-α+π2+sin(α-2α+π)=cos α+sinα=2sin ⎝ ⎛⎭⎪⎫α+π4,∵π2≤α≤π,∴3π4≤α+π4≤54π,∴-1≤2sin ⎝⎛⎭⎪⎫α+π4≤1,即所求的取值范围是[-1,1],应选C.答案 C二.填空题〔本小题一共4小题,每一小题5分,一共20分〕13.命题p :∃x ∈R ,(m +1)(x 2+1)≤0,命题q :∀x ∈R ,x 2+mxp ∧q 为假命题,那么实数m 的取值范围为________由命题p :∃x ∈R ,(m +1)(x 2+1)≤0可得m ≤-1;由命题q :∀x ∈R ,x 2+mx +1>0恒成立,可得-2<m <2,假设命题p ,q 均为真命题,那么此时-2<m ≤-1.因为p ∧q 为假命题,所以命题p ,q 中至少有一个为假命题,所以m ≤-2或者m >-1. 14.在△ABC 中,B =π4,BC 边上的高等于13BC ,那么cos A =______设BC 边上的高AD 交BC 于点D ,由题意B =π4,BD =13BC ,DC =23BC ,tan ∠BAD =1,tan∠CAD =2,tan A =1+21-1×2=-3,所以cos A =-1010.15函数f (x )=ax 3-3x 2+1,假设f (x )存在唯一的零点x 0,且x 0>0,那么实数a 的取值范围是_______f (x )有唯一正零点x 0,等价于方程ax 3-3x 2+1=0有唯一正根x 0,即a =3x -1x3有唯一正根x 0. 令g (x )=3x -1x3,g ′(x )=3〔1-x 〕〔1+x 〕x4, ∴g (x )在(-∞,-1)上递减,(-1,0)上递增,(0,1)上递增,(1,g (-1)=-2,g (1)=2,且当x <-1时,g (x )<0,当x >1时,g (x )>0,∴g (x )的大致图象如图:∴直线y =a 与y =g (x )有唯一交点,且横坐标x 0>0,只需a <g (-1)=-2.16.在数列{a n}中,a n+1+(-1)n a n=2n-1,那么数列{a n}的前12项和等于______因为a n+1+(-1)n a n=2n-1,所以a2-a1=1,a3+a2=3,a4-a3=5,a5+a4=7,a6-a5=9,a7+a6=11,…,a11+a10=19,a12-a11=21,所以a1+a3=2,a4+a2=8,…,a12+a10=40,所以从第一项开场,依次取两个相邻奇数项的和都等于2,从第二项开场,依次取两个相邻偶数项的和构成以8为首项,以16为公差的等差数列,以上式相加可得,S12=a1+a2+a3+…+a12=(a1+a3)+(a5+a7)+(a9+a11)+(a2+a4)+(a6+a8)+(a10+a12)=3×2+8+24+40=78.励志赠言经典语录精选句;挥动**,放飞梦想。

物理计算题限时训练7

物理计算题限时训练7

物理计算题限时训练(七)(限时30分钟)23.(16分))右下图为示波器的部分构造示意图,真空室中阴极K 不断发出初速度可忽略的电子,电子经电压为U 0的电场加速后,由孔N 沿长为I 、相距为d 的两平行金属板A 、B 间的中心轴线进入两板间,电子穿过A 、B 后最终可打在中心为O 的荧光屏CD 上。

若在AB 间加上变化规律为max 2cos AB U U t T π⎛⎫= ⎪⎝⎭的交变电压,恰好能让t =0时刻进入AB 间的电子经A 板右边缘射出打在荧光屏上。

假设在电子通过两板的极短时间内AB 间电场可视为恒定不变。

已知电子电荷量为e ,质量为m ,电子所受重力不计。

求:(1)电子通过孔N 时的速度大小v 0;(2)A 、B 间电压的最大值Umax 和有效值U 。

的半圆形光滑轨道。

现在A 、B 两个小物体之间夹一个被压缩的弹簧(弹簧未与A 、B 挂接)后用细线拴住,使其静止在轨道ab 上。

当烧断细线后,A 物体被弹簧弹开,此后它恰能沿半圆形轨道通过其最高点c 。

已知A 和B 的质量分别为m A =0.1 kg 和m B =0.2kg ,重力加速度g 取10 m /s 2,所有物体均可视为质点。

求:(1)A 在半圆形轨道的最高点c 处时的速度大小;(2)A 刚过半圆形轨道最低点b 时,对轨道的压力大小;(3)烧断细线前,弹簧的弹性势能。

25、(20分)如图甲所示,间距为L、电阻不计的光滑导轨固定在倾角为θ的斜面上。

在MNPQ矩形区域内有方向垂直于斜面的匀强磁场,磁感应强度为B;在CDEF矩形区域内有方向垂直于斜面向下的磁场,磁感应强度B t随时间t变化的规律如图乙所示,其中B t的最大值为2B。

现将一根质量为M、电阻为R、长为L的金属细棒cd跨放在MNPQ区域间的两导轨上并把它按住,使其静止。

在t=0时刻,让另一根长也为L的金属细棒ab从CD上方的导轨上由静止开始下滑,同时释放cd棒。

已知CF长度为2L,两根细棒均与导轨良好接触,在ab从图中位置运动到EF处的过程中,cd棒始终静止不动,重力加速度为g;t x是未知量。

江西重点中学于都中学高一学期考点限时训练7试验八试验习题

江西重点中学于都中学高一学期考点限时训练7试验八试验习题

考点限时训练7 实验八实验习题(本试卷100分考试时间60分钟)一、选择题(本题包括10个小题,每小题5分,共50分,每题有l~2项正确答案。

)1.取一块钠去掉煤油,放在燃烧匙中加热,下列实验现象描述正确的是( )①金属钠先熔化②燃烧火焰呈红色③燃烧后得到白色固体④燃烧火焰呈黄色⑤燃烧后得到淡黄色固体A.①②③B.①②⑤C.①④⑤D.①③④2.“厨房化学”是指利用家庭生活用品来进行化学实验,从而对化学进行学习和探讨的活动。

下列实验能在“厨房化学”中完成的是( )A.CO2气体不能支持蜡烛燃烧B.检验食盐中是否含碘元素C.检验自来水中是否含有Cl D.检验鸡蛋皮可否溶于酸3.有一瓶96%的浓H2SO4,欲测量它的浓度值,可采用的有效方法是( )A.用pH试纸测其pH值B.用比重计测出其密度C.用电导仪测其导电性D.观察其粘稠程度4.下列溶液中可以盛在玻璃瓶中但不能用磨口玻璃塞的是( )A.硅酸钠溶液B.氢氟酸C.氢氧化钠溶液D.氯化钠溶液5.实验室贮存下列药品的方法正确的是( )A.盛浓H2SO4的试剂瓶用橡皮塞B.盛烧碱溶液的试剂瓶用玻璃塞C.液溴中加入水且用橡皮塞D.金属钠放在煤油中密闭保存6.由实验测得,把同物质的量浓度的NaOH溶液滴入CuSO4溶液中,两者体积比为1.5:1时(残存在溶液中的Cu2+极少,可认为全部转入沉淀中),所生成的沉淀的化学式是( )A.Cu(OH)2 B.Cu(OH)2·CuSO4 C.2Cu(OH)2·CuSO4 D.3Cu(OH)2·CuSO4 7.下列实验,一定不会出现沉淀现象的是( )A.CO2气体通入Na2SiO3溶液中B.CO2气体通入饱和Na2CO3溶液中C.SO2气体通入BaCl2溶液中D.SO2气体通入Ba(NO3)2溶液中8.放在敞口容器中的下列溶液,久置后溶液中该溶质的浓度会变大的是( )A.浓硫酸B.氢氧化钠C.氯水D.氯化钠9.在实验室中,用锌、氧化铜、稀硫酸为原料制取铜,有下列两种途径:若用这两种方法制取铜的质量相等时,下列符合实验结果的是( )A.消耗相同质虽的氧化铜B.消耗相同质量的锌C.消耗相同质量的H2SO4 D.生成的硫酸锌的质量相同10.将一定量的碳与8g氧气置于密闭容器中,使之在高温下反应,当恢复至原温度时,容器内压强比原来增大0.4倍。

阅读限时训练7

阅读限时训练7

限时训练7完形填空When Glen Kruger picked a small cat from an animal shelter, he did not expect much. Yet right from the start, eight years ago, there was an uncommon connection between him and the small black cat. He 36 her Inky.“ I grew up on a hundred-acre farm and had only cats 37 playmate s,” Kruger, The seventy-year-old man, says. “My hearing was damaged by the 38 of farm equipment , so I learned to connect with 39 . They react to what they see and what you do. ”Inky was a gentle cat, 40 the house with five other cats. But on a January night in 2009, Inky did 41 that would set her apart from 42 cats forever.Kruger had gone down to the basement to 43 the wood stove for the night. When he was finished, he 44 to the top of the stairs and reached to turn off the lights. In doing so , he slipped and 45 his back against an old shelf. The heavy shelf came crashing down and sent Kruger down the stairs.46 in a pool of blood on the basement floor, Kruger felt 47 going into shock(休克). He shouted for help , 48 his wife, Brenda , was asleep in their bedroom at the opposite end of the house. 49 Kruger noticed Inky watching from the top of the stairs.“Go get Brenda, ” Krugger said to Inky.Inky 50 to the bedroom door and scratched 51 until Brenda opened it. Then Inky led her to the 52 Brenda found her husband 53 the stairs and called 911. Kruger was rushed to the hospital. “I spent six months54 there,” Says kruger . “Although I be ca me lame , I was blessed. ” Since the acci dent, Inky has 55Left Krhger’s side.36. A. gave B. chose C. named D. remembered37. A. like B. as C. except D. among38. A. sound B. alarm C. noise D. voice39. A. animals B. friends C. farmers D. neighbors40. A. sharing B. visiting C. dividing D. discovering41. A. anything B. nothing C. something D. everything42. A. familiar B. lovely C. ordinary D. outstanding 43. A. shut out B. shut off C. shut down D. shut up44. A. marched B. flew C. struggled D. climbed45. A. bent B. hit C. shook D. pulled46. A. Falling B. Lying C. Appearing D. Thinking47. A. it B. itself C. him D. himself48. A. and B. but C. or D. so49. A. Thus B. Otherwise C. Then D. Rather50. A. walked B. ran C. returned D. withdrew51. A. rapidly B. suddenly C. madly D. urgently52. A. bedroom B. basement C yard D. house53. A. at the bottom of B. in the middle of C. at the top of D. in the front of54. A. regretting B. resting C. relaxing D. recovering55. A. never B. ever C. still D. already阅读理解You may think that sailing is a difficult sport, but it is really not hard to learn it. You do not need to be strong. But you need to be quick. And you need to understand a few basic rules about the wind.First, you must ask yourself, “Where is the wind coming from? Is it coming from ahead or behind or from the side?” You must think about this all the time on the boat. The wind direction tells you what to do with the sail.Let’s start with the wind blowing from the behind. This means the wind and the boat are going in the same direction. Then you must always keep the sail outside the boat. It should be at a 90° angle (角度) to the boat. Then it will catch the wind best.If the wind is blowing from the side, it is blowing across the boat. In this case, you must keep the sail half way outside the boat. It should be at a 45° angle to the boat. It needs to be out far enough to catch the wind, but it shouldn’t flap (摆动). It shouldn’t look like on a flagpole. If it is flapping, it is probably out too far, and the boat will slow down.Sailing into the wind is not possible. If you try, the sail will flap and the boat will stop. You may want to go in that direction. It is possible, but you can’t go in a straight line. You must go first in one direction and then in another. This is called tacking. When you are tacking, you must always keep the sail inside the boat.65. What should you consider first while sailing?A. Sailors’ strength.B. Wave levels.C. Wind directions.D. Size of sails.66. What does the word “It” underlined in Paragraph 4 re fer to?A. The boat.B. The wind.C. The sail.D. The angle.67. What do you have to do when sailing against the wind?A. Move in a straight line.B. Allow the sail to flap.C. Lower the sail.D. Tack the boat.68. Where can you probably find the text?A. In a popular magazine.B. In a tourist guidebook.C. In a physics textbook.D. In an official report.阅读表达[1] People today, in all this new world of technology and thinking, have lost sight of what a true friendship is. So, though I own my best friend Jenny, I thought I would help the world out a little and explain what real, true friends are.[2] Friends don’t have to be exactly the same. They have similarities but __________________. The key to opening up the world of friendship is not only to expand on similarities but to accept each other’s faults, because you can’t ever judge your friend.[3] Friends have to argue! Because if you agree on everything, either the government has expanded cloning subjects or someone isn’t being true and is trying a little too hard.[4] You have to be comfortable together. Otherwise, you just aren’t going to click. I f you feel uneasy around the person then something isn’t quite right.[5] Friends love unconditionally. They have their little angry moments but what’s done is done and all is forgiven and forgotten. Why let something that happened in the past ruin the happiness you could have in the future?[6] Believe in love at first sight because there is the same thing happening in friendship. Some people think that you have to know someone really well to become good friends. Trust me, it’s not true.[7] These are only a few of the basics. Just remember, friends are forever. But only if you keep it that way. Don’t disrespect your friends, love them instead.76. What is the best title of the passage? (no more than 6 words)___________________________________________________________________ 77. Which sentence in the passage is the closest in meaning to the following one?Make up with your friends after the quarrels and don’t let the sadness last long.______________________________________________________________________ 78. Please fill in the blank in Paragraph 2 with proper words or phrases to complete thesentence. (no more than 8 words)____________________________________________________________________79. Please list three of the writer’s viewpoints on friendship. (no more than 10 words)①______________________②_______________________③________________________80. Translate the underlined sentence in Paragraph 6 into Chinese._____________________________________________________________________完型CBCAA CCBDB BDBCB CBADACCDA76. True Friends / Friendship/What Is Friendship77. They have their little angry moments but what’s done is done and all is forgiven andforgotten.78. they also have their differences79. ① Accept differences ② Argue ③ Love unconditionally ④ Believe in love at first sight (写出任意三项即可)80. 相信恋爱中的一见钟情吧,因为友情也是如此。

必修二 限时提分练七

必修二 限时提分练七

限时提分练七必修②Unit 2The Olympic Games Ⅰ.阅读理解A[2021·泰安市高三质量检测]Myles Kerr knew that being a Marine (水兵) comes with a lot of responsibility, but despite the huge weight he has on his shoulders, he has not forgotten the essence of being a public servant—that of being human.Seven years ago, a photo of a Marine and a young boy running a marathon immediately went viral after it was shared on social media. But what seemed like a simple image packed a much deeper backstory. This story happened in 2013, but its relevance is still as powerful as ever.The pair were running The Jeff Drench Memorial 5K in Charlevoix, Michigan when Myles Kerr came across Brandon Fuchs, a 9­year­old boy struggling to keep up with the rest of his group. Brandon, exhausted and out of breath, asked the Marine, “Will you run with me?”People who had their eyes on the prize would have refused, but the 19­year­old was different. Being a Marine, he knew exactly what he should do. Kerr put aside his goal of beating his mates and instead slowed down to accompany the struggling boy to the finish line.Because he chose to help the boy, the Marine ended up with the slowest time in his age group, according to the 5K results online.Though he might have lost the race, the Marine won over people's hearts. His act of kindness was celebrated on social media.Kerr didn't expect that his simple gesture would attract so much attention. He responded to a tweet praising his actions saying, “I was just doing what any man would do, but thank you!”He also tweeted that he received gifts from the Fuchs family for helping out Brandon.To Kerr, being a Marine was more than just being trained for combat—it also required learning how to be kind and compassionate towards the citizens they serve.1.What was Myles Kerr seven years ago?A.A Marine.B.A public servant.C.A marathon runner. D.A Michigan citizen.2.What is Myles Kerr's original goal to participate in the marathon?A.To win over people's hearts.B.To accompany the boy.C.To get the best score in his age group.D.To build up his body.3.Which of the following best describe Myles Kerr?A.Kind and unselfish.B.Enthusiastic and generous.C.Responsible and proud.D.Stubborn and helpful.4.What does the story mainly convey?A.Being a Marine bears a lot.B.Kindness matters more than prizes.C.Being a Marine means a public servant.D.Good actions spread quickly.B[2021·临沂市模拟]By now it's almost common knowledge that spending time in nature is good for you. Areas with more trees tend to be less polluted, so spending time there allows you to breathe more easily. Spending time outdoors has been linked with reduced blood pressure and stress, and seems to motivate people to exercise more. So it'll come as no surprise that there's research showing that spending time in nature is good, which has been known for thousands of years. There're dozens of papers showing that.University of Exeter Medical School researcher Mathew P. White said, “We get this idea,because patients are coming to us and they're saying, ‘Doctor, how long should I spend?’ and the doctor is saying, I don't really know.” So White and his team decided to find out by using data collected from nearly 20,000 people in England through the Monitor of Engagement with the Natural Environment Survey. And their answer? Two hours a week. People who spent at least that much time—either all at once or totaled over several shorter visits—were more likely to report good health and psychological well­being than those with no nature exposure. Remarkably, the researchers found that less than two hours offered no significant benefits.So what's so special about two hours? “I have absolutely no idea. Really. We didn't have an apriori (由因及果的) guess at what this would be. It emerged. And I'd be lying if I said we predicted this. I don't know.” Even more noteworthy, the two­hour benchmark (基准) applied to men and women, to older and younger folks, to people from different ethnic backgrounds, occupational groups, socioeconomic levels and so on. Even people with long­term illnesses or disabilities benefited from time spent in nature—as long as it was at least 120 minutes per week.While the findings are based on a tremendous number of people, nobody knows why or how nature has this benefit. “I want to be really clear about this. This is in very early stages. We're not saying everybody has to do 120. What research do we need to take this to the next step before doctors can have the true coincidence to work with their patients? But it's certainly a starting point,” White said.5.What is the first paragraph mainly about?A.The benefits of spending time in nature.B.The research on spending time in nature.C.The characteristics of spending time in nature.D.Common knowledge of spending time in nature.6.What can we infer from the result of White and his team's survey?A.The time spent in nature should be 2 hours a week all at once.B.2 hours a week at least in nature is beneficial to whomever you are.C.The time spent in nature should be 2 hours a week, no more, no less.D.2 hours a week in nature is too long for people with long­term illnesses.7.What does White expect of the findings?A.They will be in early stages.B.They will be based on many people.C.They will help all people go out in nature.D.They will be improved and further research will be done.8.Where is this text most likely from?A.A diary. B.A guidebook.C.A magazine. D.A novel.Ⅱ.七选五[2021·潍坊市高三模拟]Water SkiingWater skiing is an exciting water sport that can be a ton of fun. It takes a little patience to learn, but once you do, water skiing is a sport you can enjoy whenever you have a boat and enough flat water.__1__ Every water skier needs water skis (滑水板) and they differ depending on the size of the skier and the experience level of the skier. Of course, no one can water ski alone, so you will need to find at least two people to go with you on your water skiing adventure. You and everyone you go with will have more fun if the friends you go with also want to water ski. __2__ After you have the boat, the people, and the skis, you will also need a water skiing cable (缆绳) and a life jacket.For your first­time water skiing, you may want to either take a lesson from an expert or find a friend that has experience to teach you. __3__ The observer rides in the boat, but watches the water skier for any signals and helps the driver know when to start and stop.The person skiing starts by crouching (蹲伏) in the water; this is called a deep water start. The skis will float, but you want your body to be in a crouching position in the water. Your skis'tips should be pointing out of the water. __4__ When you are ready, you give a signal to the driver of the boat, who starts speeding. Ideally you are pulled into an upright position with your skis underneath you, gliding along the surface of the water. __5__A.You need a boat naturally.B.Most people just enjoy regular water skiing.C.The idea is to ski on the surface of the water.D.Having a successful start will most likely take a few tries.E.Your arms will be outstretched holding onto the cable tightly.F.Before you start water skiing, there are a few supplies you'll need.G.Of your two helpers, you need one to drive the boat and one to observe.Ⅲ.语法填空[2021·黑龙江省模拟]When Sarasota students took 1.________ bite of a freshly picked watermelon or mango, they knew the fruit came from a five­acre farm right in Sarasota instead of thousands of miles away, 2.________ (fresh) and more nutritional.The Sarasota Farm to School program is 3.________ (actual) part of an initiative (倡议) headed by the Florida Department of Agriculture and Consumer Services, 4.________ (plan) to increase Florida­based produce served in schools and offer healthier choices to students. In addition to nutritional value it offers, the program is 5.________ (education) as well, allowing students to get involved in the agricultural side of working in the gardens.Students from the program come out each Monday 6.________ (harvest) crops that will eventually go to 67 Sarasota County cafeterias. The farm is crowded 7.________ various kinds of fruits, squash, sunflowers and corn. For now, the farm is in its first growing season. Crops that 8.________ (grow) in May are just starting to be harvested. Outside of the farm, students are engaging in (参与) some taste tests with 9.________ they get from the gardens. It's through these tasting sessions that either a student or a farmer can get some 10.________ (inform) about what crops should populate the farm.Ⅰ.阅读理解A语篇类型:记叙文主题语境:人与社会——乐于助人——“善良比奖品更重要”【语篇解读】文章讲述了一名水兵陪伴一个小男孩跑完马拉松的故事。

2020高考生物人教版一轮复习练习:第7讲限时规范训练7ATP与酶含解析

2020高考生物人教版一轮复习练习:第7讲限时规范训练7ATP与酶含解析

限时规范训练7ATP与酶【基础题组】1.ATP是细胞的能量“通货”,下列有关说法正确的是()A.ATP的合成一定需要酶,酶的催化作用都需要ATP供能B.ATP在细胞中彻底水解后可为DNA复制提供原料C.人体成熟红细胞中ATP的产生速率在有氧、无氧条件下大致相等D.放能反应一般与ATP水解的反应相联系解析:选C。

酶的催化作用不一定需要ATP供能,如消化酶的催化作用,A项错误;ATP中含有核糖,在细胞中彻底水解后可为RNA复制提供原料,B项错误;人体成熟红细胞没有线粒体,通过无氧呼吸供能,ATP的产生速率与氧气浓度无关,在有氧、无氧条件下大致相等,C项正确;放能反应一般与ATP合成的反应相联系,D 项错误。

2.ATP又称为细胞中的“能量通货”,下列关于ATP的叙述正确的是()A.ATP的形成一定伴随着有机物的分解B.ATP参与的反应一定发生于细胞内部C.消耗ATP的物质运输一定是主动转运D.细胞呼吸的每个阶段一定能产生ATP解析:选B。

光合作用中的光反应有ATP的形成,能量来源是光能,不是有机物的分解,A错误;ATP是细胞内的能量载体,只存在于细胞中,所以ATP参与的反应一定发生于细胞内部,B正确;物质运输中,主动运输和胞吞、胞吐都需消耗ATP,C错误;细胞呼吸包括需氧呼吸和厌氧呼吸,需氧呼吸三个阶段都能产生ATP,厌氧呼吸只有第一阶段产生ATP,D错误。

3.用蛋白酶去除大肠杆菌核糖体的蛋白质,处理后的核糖体仍可催化氨基酸的脱水缩合反应,由此可推测核糖体中能催化该反应的物质是()A.蛋白质B.mRNAC.tRNA D.rRNA解析:选D。

核糖体由蛋白质和核糖体RNA(rRNA)组成,用蛋白酶处理核糖体之后,蛋白质已经被水解,但仍具有催化功能,说明发挥作用的物质是rRNA。

4.(2018·广东深圳第一次调考)细胞的新陈代谢能够在温和条件下有序地进行离不开酶,下列有关酶的说法错误的是()A.加热和酶都能加快H2O2分解的速率,但作用机理不同B.酶遇双缩脲试剂呈紫色C.酶通过形成酶—底物复合物来催化化学反应D.高温、强酸、强碱都会导致蛋白酶的空间结构改变而失活解析:选B。

2023-2024学年高一下学期英语限时训练-7 答案解析

2023-2024学年高一下学期英语限时训练-7 答案解析

高一英语限时训练7 答案解析阅读理解A 篇本文为一篇记叙文。

讲述了来自法国的24岁男子Guirec Soudee选择了和他的宠物鸡一起环游世界的故事。

1. A.细节理解题。

根据第一段“Guirec Soudee, a 24-year-old man from France, chose his pet chicken.”。

Guirec Soudee和他的宠物鸡一同旅行。

故选A项。

2. D. 细节理解题。

根据第三段“He believed they could communicate with each other well.”及第四段“Not only does it cost little to raise Monique, but she lays eggs as well — some things that are always a plus in a situation where storing a lot of food can be a challenge.”可知,宠物鸡不仅能够听Guirec Soudee说话,还能够下蛋给他作为食物,因此选择Monique作为他的同伴。

故选D项。

3. C.词句猜测题。

根据第五段“Usually Soudee lets Monique stay freely on the boat, but when the winds get terrible he ensures she is safe in her hutch so that she doesn’t fall out of his boat and into the sea.”及第六段“She follows me everywhere. All I need to do is shout ‘Monique!’ and she will come to me, sit on me, listen to my small talk and give me company,” he said.”可知,Monique有时候会使Soudee生气,但是大多数情况下还是比一个人陪伴他旅行更加合适。

江苏省扬中市第二高级中学2013届高三数学复习限时训练(1-7)

江苏省扬中市第二高级中学2013届高三数学复习限时训练(1-7)

高三数学复习限时训练(01)1、 设集合{}R x x x x A ∈+≤-=,112)2(2,则集合*⋂N A 中有 个元素。

2、若()35cos =+απ且⎪⎭⎫⎝⎛∈ππα,2,则()απ-2sin =__________ 3、已知正项等比数列{}n a 的前n 项和为n S ,若137a S =,则等比数列{}n a 的公比等于_____4、 已知函数2()f x x x =-,若2(1)(2)f m f --<,则实数m 的取值范围是 .5、 已知直线1l :32+=x y ,直线2l 与直线1l 关于直线x y -=对称,则直线2l 的斜率为_______6、 已知函数xbe ax x f +=)(图象上在点)2,1(-P 处的切线与直线x y 3-=平行,则函数)(x f 的解析式为_____7、 已知等差数列{}n a 的前n 项和为()21,n S a n a =++某三角形三边之比为234::a a a ,则该三角形最大角为 ____8、 已知直线0132=+++y x 与圆032-22=-+x y x 交于N M ,两点,则弦MN 的垂直平分线方程为__________9、 在锐角ABC ∆中,角A 、B 、C 的对边分别为a 、b 、c ,且满足(2)cos cos a c B b C -=. (1)求角B 的大小;(2)设(sin ,1),(3,cos2)m A n A ==,试m n ⋅ 求的取值范围.限时训练(01)参考答案1.72. 23-3.24. (1,1)-5. 0.56. 12.50.5x y x e +=--7. 1208. 3x-2y-3=09.(1)60B = , (2)17(2,]8高三数学复习限时训练(02)1、若复数2(3)(,()z a a i a R =--∈2007=2、若双曲线12222=-by a x 的两个焦点到一条准线的距离之比为3:2,则双曲线的离心率是___________3、已知点A 、B 、C 3=4=5=,则⋅+⋅+⋅的值是____.4、ABC ∆的三内角A ,B ,C 所对边长分别是c b a ,,,设向量),sin ,(C b a +=)sin sin ,3(A B c a -+=,若n m //,则角B 的大小为_____________5、已知:}2|1||{<-=x x A ,}11|{+<<-=m x x B ,若B x ∈成立的一个充分不必要条件是A x ∈ ,则实数m 的取值范围6、过点()0,4-作直线l 与圆0204222=--++y x y x 交于A 、B 两点,若AB=8,则直线l 的方程为______7、已知||1a = ,||2b = ,()a a b ⊥+,则a 与b 夹角的度数为 .8、若]2,0[πθ∈,且54sin =θ,则2tan θ= 9、已知向量a = (1,1),向量b 与向量a 的夹角为34π,且a ·b = -1.(1)求向量b ;(2)若向量b 与q =(1,0)的夹角为2π,向量p =2(cos ,2cos )2CA ,其中A ,C 为△ABC 的内角,且A + C =23π,求|b + p |的最小值.限时训练(02)参考答案12、53、 25-4、π655、),2(+∞ 6.、 020125=++y x 或4-=x7、23π 8、21 9、(1)b =(-1,0)或b =(-1,0).;(2)22高三数学复习限时训练(03)1、函数x x y 22-=的定义域为{}3,2,1,0,那么其值域为_____2、设复数1212,()z i z x i x =-=+∈R ,若12z z ⋅为实数,则x = .3、已知{}n a 为等差数列,且74321,0a a a -=-=,则公差d =4、有四个游戏盘,将它们水平放稳后,在上面扔一颗玻璃小球,若小球落在阴影部分,则可中奖,小明要想增加中奖机会,应选择的游戏盘的序号5、设命题014,::22>++∈∀<cx x R x q c c p 对和命题,若p 和q 有且仅有一个成立,则实数c 的取值范围是 6、1tan 2a =,则sin cos a a = 7、过定点P (1,2)的直线在x y 轴与轴正半轴上的截距分别为a b 、,则422a b +的最小值为 .8、设等比数列{}n a 中,前n 项和为n S ,已知38S =,67S =,则789a a a ++= .9、已知函数()ln f x x ax =-()a ∈R . (Ⅰ) 求函数()f x 的单调区间;(Ⅱ) 当a >0时,求函数()f x 在[1,2]上最小值.限时训练(03)参考答案1. {}0,1,3-2. 21-3. -124. (1)5. 121021<≤≤<-c c 或6. 527. 32 8.819. (Ⅰ) 1()f x a x '=-(0x >),①当a ≤ 0时,1()f x a x'=->0, 故函数()f x 增函数,即函数()f x 的单调增区间为(0,)+∞. ②当0a >时,令1()0f x a x '=-=,可得1x a=, 当10x a <<时,1()0ax f x x -'=>;当1x a>时,1()0ax f x x -'=<, 故函数()f x 的单调递增区间为1(0,]a,单调减区间是1[,)a +∞.(Ⅱ)①当11a≤,即1a ≥时,函数()f x 在区间[1,2]上是减函数,∴()f x 的最小值是(2)ln 22f a =-.②当12a ≥,即12a ≤时,函数()f x 在区间[1,2]上是增函数, ∴()f x 的最小值是(1)f a =-.③当112a <<,即112a <<时,函数()f x 在1[1,]a 上是增函数,在1[,2]a是减函数. 又(2)(1)ln 2f f a -=-,∴当1ln 22a <<时,最小值是(1)f a =-;当ln 21a ≤<时,最小值为(2)ln 22f a =-.综上可知,当0ln 2a <<时, 函数()f x 的最小值是min ()f x a =;当l n2a ≥时,函数()f x 的最小值是min ()ln 2f x =.高三数学复习限时训练(04)1、=︒+︒-︒570sin 2135cos 315sin 。

高三数学限时训练(7)

高三数学限时训练(7)

2014-2015学年高三数学(理科)限时训练(7)一、选择题1. 正弦型函数在一个周期内的图象如图所示,则该函数的表达式是( )A . y = 2sin(x -4π)B .y = 2sin(x +4π) C. y = 2sin(2x -8π) D.y = 2sin(2x +8π)2. 若函数y = sinx 和y = cosx 都是减函数,则x 是 ( )的角 A. 第一象限 B. 第二象限 C. 第三象限 D.第四象限 3.函数y =tan 35x 是( )A.周期为π的偶函数B.周期为53 π的奇函数C.周期为53π的偶函数 D.周期为π的奇函数4.若x ∈(0,2π),函数y =sin x +-tan x 的定义域是( )A.( π2 ,π]B.( π2 ,π)C.(0,π)D.( 3π2 ,2π)5.函数y =sin(2x +5π2 )的图象的一条对称轴方程为( )A.x =5π4B.x =-π2C.x =π8D.x =π46.要得到函数y =sin(2x -π4 )的图象,只要将y =sin2x 的图象( )A.向左平移π4B.向右平移π4C.向左平移π8D.向右平移π87.在[0,2π]上满足sin x ≥12 的x 的取值范围是( )A.[0,π6]B.[π6 ,5π6 ]C.[π6 ,2π3]D.[5π6,π]8.函数y =5+sin 22x 的最小正周期为( ) A.2π B.π C. π2D. π4二、填空题9. 若函数y =A cos(ωx -3)的周期为2,则ω= ;若最大值是5,则A = .10. 振动量y =2sin(ωx +φ)(ω>0)的初相和频率分别是-π和32,则它的相位是________.11.不等式sin x >cos x 的解集为 . 12.函数y =sin(2x +π3)的递增区间是 .13.已知f (x )=ax +b sin 3x +1(a ,b 为常数),且f (5)=7,则f (-5)= .14. 方程2cos()14x π-=在区间(0,)π内的解是 .答题栏姓名:_____________________学号:_____________________分数:_____________________9.___________________ 10._________________ 11._________________12.___________________ 13._________________ 14.__________________15. 设a 是第二象限的角,sin a =53,求sin (637π-2a )的值.。

高中英语 限时练7 北师大版选修8

高中英语 限时练7 北师大版选修8

河南省滑县第六高级中学高中英语限时练7阅读理解A“In real life, the daily struggles between parents and children are around thesenarrow problems of an extra hour, extra TV show, and so on” said Avi Sadeh, psychologyprofessor at Tel Aviv University. “Too little sleep and more accidents,” he said.Sadeh and his colleagues found an extra hour of sleep can make a big difference. Thechildren who slept longer, although they woke up more frequently during the night,scored higher on tests, Sadeh reported in the March/April issue of journal Child Development.“When the children slept longer, their sleep quality was somewhat weak, but in spiteof this their performance for study improved because the extra sleep was moresignificant than the reduction in sleep quality. ” Sadeh said.“Some studiessuggested that lack of sleep as a child affects development into adulthood and it’smore likely to develop their attention disorder when they grow older. ”In earlier studies, Sadeh’s team found that fourth graders slept an average of 8.2 hours and sixth graders slept an average of 7. 7 hours.“Previous research has shown children in elementary school need at least nine hoursof sleep a night on a regular basis, said Carl Hunt, director of the National Centeron Sleep Disorders Research in Bethesda, and high-school-age children need somewhatless, he said, adding the results of insufficient sleep could be serious.“A tired child is an accident waiting to happen,” Hunt said. “And as kids get older,toys get bigger and the risks higher. ”Hun t also said too little sleep could resultin learning and memory problems and long-term effects on school performance.“This is an important extension of what we already know, ” Hunt said of Sadeh’sresearch, adding sleep is as important as nutrition(营养) and exercise to good health.“To put it into reality,” Hunt said, “parents should make sure they know when theirchildren actually are going to sleep and their rooms are conducive to sleeping insteadof playing. ”1. What is Child Development?A A new storyB A popular book C. A periodical magazineD A TV programme2. How many persons are exactly mentioned in the text?A OneB TwoC ThreeD Four3. The underlined phrase “conducive to” (in the l ast sentence) means ________.A helping to happenB influenced byC full ofD acceptable of4. Which of the following statements is NOT true according to the passage?A. There are some daily struggles between parents and children because of having nothing in common with extra rest time.B. The children who sleep longer are weak in their study.C. Lack of sleep as a child has great effect on their development into adulthood.D. In general, children in elementary school need at least nine hours of sleep a night. CBABBFear may be felt in the heart as well as in the head, according to a study that has found a link between the cycles of a beating heart and the chance of someone feeling fear.Tests on healthy volunteers found that they were more likely to feel a sense of fear at the moment when their hearts are contracting(收缩) and pumping blood around their bodies, compared with the point when the heartbeat is relaxed. Scientists say the results suggest that the heart is able to influence how the brain responds to the fearful event, depending on which point it is at in its regular cycle of contraction and relaxation.Sarah Garfinkel at the Brington and Sussex Medical School said: “Our study shows for the first time that the way in which we deal with fear is different depending on when we see fearful pictures in relation to our heart.”The study tested 20 healthy volunteers on their reactions to fear as they were shown pictures of fearful faces. Dr Garfinkel said, “The study showed fearful faces are better noticed when the heart is pumping than when it is relaxed. Thus our hearts can also affect what we see and what we don’t see—and guide whether we see fear.”To further understand this relationship, the scientists also used a brain scanner(扫描仪) to show how the brain influences the way the heart changes a person’s feeling of fear.“We have found an important mechanism by which the heart and the brain ‘speak’ to each other to change our feelings and reduce fear,” Dr Garfinkel said.“We hope that by increasing our understanding about how fear is death with and ways that it could be reduced, we may be able to develop more successful treatments for anxiety disorders, and also for those who may be suffering from serious stress disorder.”5. What is the finding of the study?A. One’s heart affects how he feels fear.B. Fear is a result of one’s relaxed heartbeat.C. Fear has something to do with one’s health.D. One’s fast heartbeats are likely to cause fear.6. The study was carried out by analyzing _________.A. volunteers’ heartbeats when they saw terrible pictures.B. the time volunteers saw fearful pictures and their health conditions.C. volunteers’ reactions to horrible pictures and data from their brain scans.D. different pictures shown to volunteers and their heart-brain communication.7. Which of the following is closet in meaning to “mechanism” in Paragraph 6?A. Order.B. System.C. Machine.D. Treatment.8. This study may contribute to ________.A. treating anxiety and stress better.B. explaining the cycle of fear and anxiety.C. finding the key to the heart-brain communication.D. understanding different fears in our hearts and heads.二、完形填空(1.5*20=30)I do a lot of management training each year for the Circle K Company. Among the topic we ___9___ in our classes is the ___10___ of quality employees.What has ___11___ you to stay long enough to become a manager?” I asked.After a while a new manager ___12___ the question and said slowly, “It was a baseball ___13___.”Cynthia said that she ___14___ to take a Circle K clerk job as an interim(临时的) job ___15___ she looked for something else. On her second day behind the counter, she received a ___16___ from her nine-year-old son, Jessie. He needed a baseball glove for Little League. She ___17___ that as a single woman, ___18___ was tight, and her first ___19___ would have to go for paying bills.When Cynthia arrived for work the ___20___ morning, Patricia, the store manager, handed her a box. “I overheard you ___21___ to your son yesterday,” she said, “and I know that it is ___22___ to explain things to kids. This is a baseball glove for Jessie. I know you have to pay bills before you can buy gloves. You know we can’t ___23___ good people like you as ___24___ as we would like to, ___25___ we do care, and I want you to know how ___26___ you are to us!”The thoughtfulness, empathy(同情) and love of the store manager ___27___ that people remember more how much an employer ___28___ than how much he pays.9. A. discuss B. write C. learn D. find10. A. managing B. selling C. keeping D. seeking11. A. made B. ordered C. forced D. caused12. A. made B. took C. raised D. replied13. A. pole B. glove C. hole D. match14. A. ought B. liked C. had D. used15. A. when B. because C. while D. though16. A. letter B. call C. notice D. announcement17. A. turned out B. pointed out C. explained D. complained18. A. work B. food C. money D. clothing19. A. bill B. check C. day D. visit20. A. last B. first C. next D. past21. A. lying B. talking C. crying D. murmuring22. A. good B. easy C. hard D.necessary23. A. thank B. use C. employ D. pay24. A. many B. early C. soon D. much25. A. nor B. but C. and D. however26. A. kind B. terrible C. much D. important27. A. shows B. insists C. realizes D. recognizes28. A. needs B. gets C. likes D. cares三、短文改错(共十小题,每小题1分,满分10分)Last year, I was addicted with playing computer games. I found it hard to breaking away from the bad habit. My teacher talked to my parents about this, and they made me to promise not to play those games again. I tried hard, but I found it uselessly. The moment my fingers left the keyboard, I would feel very uncomfortable. Because I was determined to forget the games, I still could not concentrate on the lessons giving in classes.Fortunately, psychological advisor in our school came to know this. He talks with me about his problem. At last, he offered his advices on how to get rid of the addiction. Now I can manage to control myself.阅读 CBAB ACBA完形 ACDBB DCBCC BCBCD DBDADLast year, I was addicted withto playing computer games. I found it hard to breakin gbreakaway from the bad habit. My teacher talked to my parents about this, and they made me to\ promise not to play those games again. I tried hard, but I found ituselessl yuseless. The moment my fingers left the keyboard, I would feel very uncomfortable.Becaus eAlthough/ThoughI was determined to forget the games, I still could not concentrateon the lessons givin ggivenin classes.Fortunately, ∧a psychological advisor in our school came to know this. He talk stalkedwith me about hismy problem. At last, he offered his advice sadviceon how to get rid ofthe addiction. Now I can manage to control myself. 欢迎您的下载,资料仅供参考!。

复习限时训七 答案

复习限时训七 答案

爱莲说答案14.(1)通“繁”多.(2)洗涤(3)更,更加。

(4)“植”通“直”,立。

(5)当然(5分,各1分,意思对即可)15(1)它的茎中间贯通,外形挺直,不生枝蔓,不长枝节。

(2)对于菊花的喜爱,在陶渊明以后很少听到了。

(4分,各2分,意思对即可)陶渊明“爱菊”的原因:花之隐逸者也;世人“爱牡丹”的原因:花之富贵者也(2分)17.示例一:这是一个反问句。

表达了知音甚少的无限感慨。

一方面照应上文“予独爱莲”,另一方面也透露出对人生世事的感叹,慨叹当时与作者志同道合的人少,能做到品行高洁的人少。

示例二:既明确写出了作者对莲花的喜爱,又表达了作者对追名逐利的事态的厌恶,不与世俗同流合污的态度。

(4分)别惹乌鸦16.答案:会制造工具,长期记忆能力强,具有语言理解能力,具有高智商。

评分:答对一个方面得1分,共4分。

意思对即可。

17.答案:黑猩猩和人类有着大部分相同的基因,海豚等哺乳动物的大脑与人类有相似之处,因此,传统的智力进化论认为:“智力进化的终极是人类的大脑皮层。

”但是鸟类的大脑是一种与人类完全不同的丛装结构,却进化出高级认知能力。

由此推翻了传统智力进化论,进而推导出“生命之树上,智力的构建单位很可能是一样的,只不过在不同的枝干上长出了不同的形状”这一新的论断。

评分:语意正确,语言连贯,推导过程清晰,4分。

意思对即可。

18.答案:示例一:举例子,举出乌鸦偷藏食物、被捕捉做实验对实验人员的报复的事例,既具体生动,饶有趣味,又能有力地突出乌鸦社会性动物的特征。

示例二:作比较,将乌鸦与猩猩在制造工具、记忆力、智商等方面作比较,一方面突出了乌鸦等鸟类所具有的高级认知能力水平,另一方面为进化理论的创新提供前提。

评分:答出一种说明方法即可,举例1分,作用2分。

共3分。

19.答案:科学研究和科学探索①需要长期细致地观察、大量反复地实验,②并在此基础上进行合理的联想、科学的比较、缜密的分析,③需要具有挣脱传统思想束缚的创新精神。

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限时训练7参考答案(2015-01-25)
【答案解析】 1.C 2.D
解析:1题,.若a和b分别表示赤道和北回归线,那么此图为北半球的热带地区,甲为东北信风的迎风坡,降水多,乙地为背风坡,降水少,所以甲地可能为热带雨林气候,乙地可能为热带草原气候,因而C正确。

2题,“若a和b分别表示北纬40°和北纬60°,岛屿以东不远就是一块大陆”,那么此图为北半球盛行西风带,气候是典型的温带海洋气候,温和湿润,不适合种植甘蔗和粮食作物,A和B 都错;岛屿山脉海拔较低,不可能终年看到积雪,C错;甲地为西南风的背风坡,风力小,适合建设港口,所以D正确。

【知识点】本题主要考查等值线的判读。

【答案解析】 3.A 4.A
解析:3题,若此图为等高线图,实线向数值小的地区弯曲,所以为山脊;虚线向数值大的地区弯曲,所以为山谷。

A正确。

4题,若虚线所在区域为陆地,实线所在区域为太平洋,那么可以判断此时陆地A地气温低于同纬度海洋地区的温度,所以应该为北半球的冬季,A 正确。

【思路点拨】能够灵活应用等值线判读规律是解决此题的关键。

【知识点】本题主要考查天气系统对气温及气压的影响、冻土对地理环境影响分析。

【答案解析】 3.C 4.D
解析:3题,从图中可知看出,此天气系统为高压中心。

此时甲地等压线稀疏,所以风力较小;但其西部等压线密集,所以未来30小时会出现风力增强。

根据等压线分布状况,此时甲地吹东北风,未来30小时后要变成偏南风,所以气温升高;C正确。

4题,由于冻土的存在,所以.图示地区树木多扎根较浅,A错;冻土的存在,使得水不容易下渗,加上温度高,蒸发弱,所以此地区比较湿润,B、C错;纬度高,气温低,由于冻土存在,地表水不易下渗,易形成沼泽、湿地。

【思路点拨】天气系统是常考知识点,要注意总结其规律;冻土对地理环境的影响是多方面的,也是常考知识点,除了对河流影响,还有对东北地区沼泽的形成有影响。

【知识点】本题主要考查经纬网基础知识和地球运动部分知识点。

【答案解析】5.D 6.D
【答案解析】7.D 8.A
【答案解析】9.B 10D
解析:9题,根据所学知识可知,⑤⑥两地间的距离小于①②两地之间的距离,A错;一年中,②③两地的正午太阳高度有两次是相等的,即当太阳直射点直射20°N时,B正确;①地与⑤地日出时刻只有在春秋分时候相同。

C错;③地位于西半球,②⑥两地位于东半球,所以D错。

10题,当晨线经过①④两地时,说明北半球此时为冬半年,北极地区出现极夜,北半球各地昼短夜长,越往北去夜越长,太阳东南升起,西南落下,所以A和B都错;①地为晨线与赤道的交点,其所在的经线地方时为6点,即20°W为6点,所以太阳直射点经度为12点的经线,度数为东经70°,D正确。

【思路点拨】本题考查了经纬网基础知识和地球运动部分知识点。

难度较小。

【知识点】本题考查等高线图形判读。

【答案解析】11.B 12.A
解析:11题,根据题目信息和长城景观图可知,长城建筑在山脊山,地形陡峭,结合等高线地形图可以判断,②地为山脊线,所以B正确。

12题,若在图8所示地区修建公路,起伏最小的一定是沿着等高线走向的,结合图中信息可以看出,①线路符合以上条件,所以A正确。

【思路点拨】熟悉等高线地形图的一般判断方法是解题的关键。

【知识点】本题主要考查河流的水文特征及流域植被带判断。

【答案解析】 13.B 14.A
解析:13题,根据图中信息可知,此地为地中海气候,夏季炎热干燥,冬季温和多雨;所以冬季河流流量大于夏季,输沙量也大于夏季,B正确。

14题,无论南北半球,河流的凹岸侵蚀严重,所以四地中受流水侵蚀作用明显的是乙处和丙处,但乙处河流宽度小,河流弯曲度也大于丙处,同时地转偏向力右偏,所以最显著的是乙处;图示区域植被类型以亚热带常绿硬叶林为主。

A正确。

【思路点拨】本题考查内容较多,设问灵活,难度较大。

15.C 16.B
17.D
18.B
解析:19.C 20.D
第19题,S市为地中海气候,夏季受副热带高气压带控制,多下沉气流,风力较弱,导致常被雾笼罩,故C项正确。

第20题,S市为地中海气候,夏季受副热带高气压带控制,故D项正确。

【知识点】本题考查河流补给及河流水文特征分析。

【答案解析】21.B 22.A
解析:21题,关键等高线弯曲方向与河流流向相反的规律可知,A湖补给甲河,乙河补给乙河B湖,乙河属于内流河,B正确。

22题,如果两幅图中等高距相同,甲图比例尺大,水平距离小,所以落差大,甲河流流速要快于乙河流,A正确。

【思路点拨】等高线弯曲方向与河流流向相反是常考的知识点,要多留心,本题难度不大。

【知识点】本题考查等高线判读。

【答案解析】23.C 24.D
解析:23题,根据图中信息可知,甲地位于坡度较陡的山坡上,而乙地位于平原上,附近有河流经过,水源充足,所以甲村落规模通常比乙村落小,C正确。

24题,该地为华北地区,植被类型为落叶阔叶林,A错;华北地区水资源不足,制约其经济发展,B错;华北地区夏秋季节台风相对较少,农业生产受到台风的威胁较小,C错;夏季,该地暴雨集中,山区可能会出现泥石流,D正确。

【思路点拨】准确解读图中信息和了解华北地区地理概况是解题的关键,本题难度较小。

【知识点】本题考查硬化开放日期影响因素及地形判断。

【答案解析】25B 26.C
解析:25题,由于韩国樱花开放日期等值线大致呈东西走向、南北更替,因此平原地形不可能主要分布在南北方;与同纬度地区相比西部地区樱花开放日期一般早于东部,因此平原主要分布在西部地区,B正确。

26题,樱花开放日期的早晚主要受气温因素的影响,因地形、太阳辐射和洋流能影响气温,故其也影响樱花开放日期的早晚,C正确。

【思路点拨】樱花开放日期等值线与等温线一样,灵活迁移知识是解题的关键,本题难度不大。

【知识点】本题考查地图与地球部分知识点。

【答案解析】27.C 28.A 29.B
解析:27题,根据地图知识可知,ab=cd=111cos10°x20km,bd=ac=111x20km,所以D正确。

28题,若a点比b点的时间晚10小时,则bd经度为180°,a点在d的西北方,A正确。

29题,“在ac经线上,若由c点至a点,各地日出的时刻越来越早”说明越往北去,昼越长,此时北半球为夏季,我国各地昼长夜短,A错;天安门广场的升旗时间早于6点,B正确;南极地区有极夜现象出现,C错;此时是3月21日至次9月23日,D错。

【思路点拨】本题考查地图基本知识点,难度较小。

31.【解题思路】:该题考查考生获取信息、分析问题、解决信息的能力,归纳、阐述观点的能力。

河流水文特点的描述,要结合区域内气候、降水、地形、陆地形状等。

航运价值的优劣取决于:气候----流量,落差----水流速度、航行条件;水能价值优劣取决于:水量、落差。

两地降水量的多少的原因在于夏季风风向、地形、迎风、背风;水资源丰歉分析要从自然、人为两方面分析,重点阐述人为需求、污染、不合理利用造成的水资源紧张;处于地形雨,雨影区一侧的濑户内海沿岸河流大气降水水源补给较少。

答案:(本题25分)
(1)日本河流短;流域面积小;水流急;流量季节变化较明显。

(4分)
(2)日本河流短小而湍急,不利于航运;水能资源丰富。

(4分)
(3)因为夏季风会带来丰富的海洋水汽,形成大量地形雨,从而补给地表径流;而夏季日本海一侧处于背风坡,雨水较少。

(4分)因为日本太平洋沿岸属世界著名工业区,城市密集,人口众多,工业与生活用谁需求量大。

(4分)
(4)在濑户内海沿海岸地区,冬季有北部的山脉阻挡西北季风带来的日本海水汽,夏季有南部的山脉阻挡东南季风带来的太平洋水汽。

(4分)
(5)维护流域生态环境;统筹安排供水、发电、防洪等任务;制定流域与水资源综合管理的政策与措施等。

(5分)
32.(15分)(1)副热带高气压东风信风中纬西风赤道低气压夏炽热干燥(2)温带海洋性 40-60O的大陆西岸中纬西风海洋温和多雨①③
(3)热带草原热带季风
(4)亚热带季风海陆热力性质的差异。

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