（2019版）新人教版高中英语必修第二册Unit 2 Wildlife protection Reading for Writing课后一练（含答案）.doc

1、第 1页（共 11页）Unit2 Wildlife protectionSection D Reading for Writing一、完成句子1This activity _ _(激起) my interest inChinese Calligraphy.2Scientists are still _ _ a cure to thecommon cold.科学家仍在寻求治疗感冒的方法。3According to Jack，_ _ global warming_ leads to the extinction of many animals.杰克认为，正是全球变暖导致许多动物灭绝。4After

2、_ _ _ _ _，my mum began to prepare for the evening meal.像平常一样浇完花后，我妈妈开始准备晚饭。5Could you _ _ _ _while Ihave a swim?我游泳的时候你能帮我照看衣服吗？二、阅读理解How does an ecosystem(生态系统)work？What makes thepopulations of different species the way they are? Why are thereso many flies and so few wolves? To find an answer，scien

3、tistshave built mathematical models of food webs，noting who eatswhom and how much each one eats.With such models，scientists have found out some key第 2页（共 11页）principles operating in food webs.Most food webs，for example，is made up of many weak links rather than a few strong ones.Whena predator(掠食动物)a

4、lways eats huge numbers of a singleprey(猎物)， the two species are strongly linked; when a predatorlives on various species，they are weakly linked.Food webs maybe dominated (支配) by many weak links because that arrangementis stabler over the long term.If a predator can eat severalspecies，it can survive

5、 the extinction of one of them.And ifa predator can move on to another species that is easier to findwhen a prey species becomes rare，the switch allows the originalprey to recover.The weak links may thus keep species fromdriving one another to extinction.Mathematical models have also shown that food

6、 webs may beunstable，where small changes of top predators can lead to bigeffects throughout entire ecosystems.In the 1960s，scientistspointed out that predators at the top of a food web had asurprising amount of control over the size of populations ofother speciesincluding species they did not direct

7、ly attack.And unplanned human activities have proved the idea of topdown control by top predators to be true.In the ocean，wefished for top predators such as cod on an industrial scale，whileonland ， wekilledofflargepredatorssuchaswolves.These actions have greatly affected the ecologicalbalance.Scient

8、ists have built an earlywarning system based on第 3页（共 11页）mathematical models.Ideally，the system would tell us when toadapt human activities that are pushing an ecosystem toward abreakdown or would even allow us to pull an ecosystem back fromthe borderline.Prevention is key， scientists says, because

9、 onceecosystems pass their tipping point(临界点)，it is remarkablydifficult for them to return.1.Whathavescientistsdiscoveredwiththehelpofmathematical models of food webs?AThe living habits of species in food webs.BThe rules governing food webs of the ecosystems.CThe ways to studying the species in the

10、ecosystems.DThe differences between weak and strong links in foodwebs.2.A strong link is found between two species when a predator_.Ahas a wide food choiceBcan easily find new preyCsticks to one prey speciesDcan quickly move to another place3.What will happen if the populations of top predators ina

11、food web greatly decline?AThe prey species they directly attack will die out.BThe species they indirectly attack will turn into toppredators.CThe living environment of other species will remain第 4页（共 11页）unchanged.D The populations of other species will experienceunexpected changes.4.What conclusion

12、 can be drawn from the examples inParagraph 4?AUncontrolled human activities greatly upset ecosystems.BRapid economic development threatens animal habitats.CSpecies of commercial value dominate other species.DIndustrial activities help keep food webs stable.5.How does an early warning system help us

13、 maintain theecological balance?ABy getting illegal practices under control.BBy stopping us from killing large predators.CBy bringing the brokendown ecosystems back to normal.DBy signaling the urgent need for taking preventiveaction.三、阅读填句Where Do Mosquitoes(蚊子)Go in Winter?Why do mosquitoes，everywh

14、ere in warmer months，disappearcompletely in winter ？1Mosquitoes are cold bloodedinsects，meaning that they dont like the cold and prefertemperatures that are 80 degrees Fahrenheit (华氏温度) ormore.When the temperature drops，they actually lose theirability to fly and become motionless.第 5页（共 11页）2 They w

15、ould never be able to fly far enough.The actualanswer to the question is different for male and femalemosquitoes.Male mosquitoes? They die.But thats not justbecauseofthecold.Malemosquitoeshavefarshorterlifespans(寿命) than females，and they die in autumn.Female mosquitoes，though，can live through the wi

16、nter.Theyhibernate (冬眠)In autumn，the females will go into hollowlogs or cracks in the ground and enter this still state.3They put off their development，typically for months.When it warms up again，the females will come out fromhibernation.At this point，theyre getting ready to lay theireggs and they n

17、eed as much blood as possible to help the eggsdevelop.The females must find a blood meal to provide theprotein needed by their eggs to develop，just in the time，when humans are outdoors in short sleeves enjoying the warmingweather.4It actually doesnt have to be what we humans would consider“cold” to

18、put a mosquito in danger.While these pests liveactively when its around 80 degrees F，most species can startheading into hibernation when it drops to around 50.5Thisis when female mosquitoes start looking for a place for sleep.AThe obvious answer is that its cold.BNow its time for male mosquitoes to

19、wake up.CIts only the female mosquitoes that are biting you.DUnlike birds，mosquitoes dont fly south for the winter.第 6页（共 11页）EAnything below 50 degrees is already too cold for mostmosquitoes.FThey carry on with life only when there is enough waterfor their needs.GThey can hibernate for up to six mo

20、nths in freezing orwaterless conditions.四、读后续写阅读下面材料，根据其内容和所给段落开头语续写两段，使之构成一篇完整的短文。Bobby was getting cold sitting out in his backyard in thesnow.Bobby didnt wear boots；or rather，he didnt own any.Thethin sneakers he wore had a few holes in them and they did apoor job of keeping out the cold.Bobby had

21、 been in his backyard for about an hour already.Tryas he might，he could not come up with an idea for his mothersChristmas gift.He shook his head as he thought， “This isuseless.Even if I do come up with an idea，I dont have any moneyfor a gift.”Wiping tears from his eyes，Bobby started walking down tot

22、he street where the shops were.It wasnt easy being six withouta father，especially when he needed a man to talk to.Bobby walked from shop to shop，looking into each decoratedwindow. Everything seemed so beautiful but so out of reach.Itwas starting to get dark and Bobby reluctantly turned to walk第 7页（共

23、 11页）home when suddenly his eyes caught the glimmer(微光) of thesetting suns rays reflecting on something on the roadside.Hereached down and discovered a shiny dime(一角硬币)Never before has anyone felt as wealthy as Bobby did at thatmoment.As he held his newlyfound treasure，warmth spreadthroughout his en

24、tire body and he walked into the firststore.His excitement quickly turned cold when the salespersontold him that he could not buy anything with only a dime.He saw a flower shop and went inside to wait in line.Whenthe shop owner asked if he could help him，Bobby presented thedime and asked if he could

25、 buy one flower for his mothersChristmas gift.The shop owner looked at Bobby and his offeringtencent.Then he put his hand on Bobbys shoulder，saying，“You just wait here and Ill see what I can do for you.”The sound of the door closing as the last customer leftpulled Bobby back to reality.All alone in

26、the shop，Bobby beganto feel alone and afraid.注意：1.续写的词数应为 150 左右；2请按如下格式作答。Eventually the shop owner came out and moved to thecounter._With the bunch of beautiful roses in his hands，Bobby backedoffandthenturnedandran._第 8页（共 11页）一、完成句子1.stirred up2.searching for3.it is; that4watering the flowers as

27、usual5watch over my clothes二、阅读理解1 B细节理解题。根据第一段“With such models, scientistshave found out some key principles operating in food webs.”可知，借助食物链的数学模式，科学家们发现了食物链的运行规则。故选 B。2C细节理解题。根据第二段“When a predator (掠食动物)always eats huge numbers of a single prey(猎物), the two speciesare strongly linked”可知，当捕食者总是吃大量

28、的单一猎物，这两个物种是紧密相连的。故选 C。3D推理判断题。根据第三段“predators at the top of afood web had, a surprising amount of control over the size ofpopulations of other species they did not directly attack”可知， 处于食物链顶端的食肉动物对它们没有直接攻击的其他物种的种群数量有着惊人的控制，由此可推断出，如果食物链顶端的食肉动物的数量大大下降， 其他物种的种群将经历意想不到的变化。 故选 D。4 A推理判断题。 根据第五段 “Ideally

29、, the system would tellus when to adapt human activities that are pushing an ecosystemtoward a breakdown or would even allow us to pull an ecosystemback from the borderline.”可知，人类过度的活动会将生态系统推向崩溃，由此可推断出，不受控制的人类活动极大地破坏了生态系统。故选 A。第 9页（共 11页）5D细节理解题。根据最后一段可知，早期预警系统发出紧急需要采取预防行动的信号帮助我们维持生态平衡。故选 D。三、阅读填句1A

30、根据上文“Why do mosquitoes，everywhere in warmermonths，disappear completely in winter？”询问为什么冬天蚊子消失，而温暖的月份蚊子到处都是？而 A 项“显然是因为寒冷”则是前句的答案，前后句一问一答。故选 A 项。2D根据下文“They would never be able to fly far enough.”它们永远飞不了那么远，而 D 项“不像小鸟，蚊子不会冬天飞到南方去。 ”承接下文。故选 D 项。3G根据上文“They hibernate.”蚊子是冬眠的，而 G 项“它们可以在冰冻或无水的条件下冬眠长达 6

31、个月”与其前后照应，句中hibernate 为关键词。故选 G 项。4 C根据上文 “The females must find a blood meal to providethe protein needed by their eggs to develop，just in the time，when humans are outdoors in short sleeves enjoying the warmingweather.” 可知， 母蚊子必须找血液提供蛋白质以便繁殖， 这个季节，人们开始穿短袖。而 C 项“这个时候只有母蚊子叮咬你。 ”与前句构成因果关系。故选 C 项。5E根据上

32、文“While these pests live actively when itsaround 80 degrees F，most species can start heading intohibernation when it drops to around 50.”和后文“This is whenfemale mosquitoes start looking for a place for sleep.”可知，大部分的生物在温度低于华氏 50 度时，开始冬眠，这时候母蚊子也开始寻找冬眠的地方，而 E 项“任何低于华氏 50 度的地方对于蚊子第 10页（共 11页）来说已经太冷了”在该句

33、中为过渡句。故选 E 项。四、读后续写Eventually the shop owner came out and moved to thecounter.There，before Bobbys eyes，lay twelve red roses，withleaves of green and tiny white flowers all tied together witha big silver tape.Bobbys heart sank as the owner placed themgently into a long white box.“That will be ten cent

34、s，youngman.”the shop owner said，reaching out his hand for thedime.Slowly，Bobby moved his hand to give the man his dime.Couldthis be true？He wondered.With the bunch of beautiful roses in his hands，Bobby backedoff and then turned and ran.Within minutes，he was at home，still breathless.“Look，Mother，what

35、 have I got for you？”Bobby called out in the backyard.Mother came out from insidethe house.She could hardly believe her eyes upon seeing thebeautiful flowers in front of her. “Merry Christmas！ ” Bobby saidand began to tell her everything he had experienced in theflowershop.Tearfully ， Motherhuggedhersoninherarms.Standing in the bitter cold air，they somehow didnt feelcold at all.第 11页（共 11页）