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1、Unit 5Travelling abroadSection Warming Up,Pre-reading,Reading & Comprehending课后篇巩固提升一、单句改错1.The coat is too large!It isnt fit me.答案isntdoesnt2.This is the first time that I had visited China.答案hadhave3.It was great comfort to see their son back home safe.答案was后加a4.So far,he has made full preparation
2、 for the coming exam.答案preparationpreparations5.The police are questioning those concerned about the murder.答案aboutwith二、用所给短语的适当形式填空be occupied withget losttake upfit in withadjust oneself tosucceed inrefer toget used toas far as. be concernedkeep it up1.The driver on the rainy night,without a navi
3、gation system.答案got lost2.Only in this way can you your classmates.答案fit in with3.Although you have got the first position,you should and do better.答案keep it up4.Only after you the new conditions can you begin to increase your level in research.答案adjust yourself to5.You will soon living in the count
4、ry.答案get used to6.In his lecture,he the importance of communication.答案referred to7.,I like to study in America because I enjoy the sight of it.答案As far as I am concerned8.You have the experiment and we congratulate you on it.答案succeeded in9.Mary always helps her mother even though going to school mo
5、st of her day.答案takes up10.I my lessons now,so I cant play basketball with you and dont bother me!答案am occupied with三、翻译句子1.那是史密斯先生第一次来这家酒店。答案It was the first time that Mr.Smith had come to this hotel.2.学生们正在为即将到来的考试而做准备。答案The students are making preparations for the coming examinations.3.医生竭力劝他去休假。
6、答案The doctor strongly recommended that he(should)take a holiday.4.It is usually acknowledged that he is the finest poet at present.答案大家都认为他是当今最好的诗人。5.As far as Im concerned,I would like to say I am not in favour of the plan.答案就我而言,我想说我不赞成这计划。6.She occupied herself with housework most of the time.答案她
7、大部分时间都忙于做家务。四、阅读理解A(2019天津)How does an ecosystem(生态系统) work?What makes the populations of different species the way they are?Why are there so many flies and so few wolves?To find an answer,scientists have built mathematical models of food webs,noting who eats whom and how much each one eats.With suc
8、h models,scientists have found out some key principles operating in food webs.Most food webs,for instance,consist of many weak links rather than a few strong ones.When a predator(掠食动物) always eats huge numbers of a single prey(猎物),the two species are strongly linked;when a predator lives on various
9、species,they are weakly linked.Food webs may be dominated by many weak links because that arrangement is more stable over the long term.If a predator can eat several species,it can survive the extinction(灭绝) of one of them.And if a predator can move on to another species that is easier to find when
10、a prey species becomes rare,the switch allows the original prey to recover.The weak links may thus keep species from driving one another to extinction.Mathematical models have also revealed that food webs may be unstable,where small changes of top predators can lead to big effects throughout entire
11、ecosystems.In the 1960s,scientists proposed that predators at the top of a food web had a surprising amount of control over the size of populations of other speciesincluding species they did not directly attack.And unplanned human activities have proved the idea of top-down control by top predators
12、to be true.In the ocean,we fished for top predators such as cod on an industrial scale,while on land,we killed off large predators such as wolves.These actions have greatly affected the ecological balance.Scientists have built an early-warning system based on mathematical models.Ideally,the system w
13、ould tell us when to adapt human activities that are pushing an ecosystem toward a breakdown or would even allow us to pull an ecosystem back from the borderline.Prevention is key,scientists say,because once ecosystems pass their tipping point(临界点),it is remarkably difficult for them to return.1.Wha
14、t have scientists discovered with the help of mathematical models of food webs?A.The living habits of species in food webs.B.The rules governing food webs of the ecosystems.C.The approaches to studying the species in the ecosystems.D.The differences between weak and strong links in food webs.答案B解析细节
15、理解题。根据文章第二段第一句中的“scientists have found out.in food webs.”得知科学家们发现了食物网运行的关键法则,即B项。2.A strong link is found between two species when a predator .A.has a wide food choiceB.can easily find new preyC.sticks to one prey speciesD.can quickly move to another place答案C解析细节理解题。根据第二段第三句中的“When a predator.are strongly linked”得出结论只吃一种猎物是“strong link”。3.What will happen if the populations of top predators in a food web greatly decline?A.T
