1、必修二unit2 listening and speaking 课后练Part I基础部分一、单词拼写1、The heart attacks may directly _ (危害) peoples lives.2、I can see some _ (猎人) coming towards us.3、Sorry Im late. I might have turned off the _ (闹钟) clock and gone back to sleep again.4、Last year the number of students who graduated with a driving li
2、cense reached 200,000, an _ (平均数) of 40,000 per year.5、It is reported that rapid economic development threatens animal _ (栖息地).6、When you get there, you can see there are _ (海报) advertising the new movie throughout the town.7、The _ (物种) are in danger of disappearing in the world.8、Well take action _
3、 (立刻) to help him out of trouble.9、What he has done recently is _ (非法的).10、This mass _ (灭绝) is caused by hunting, habitat loss and pollution.二、用所给单词的适当形式填空1、The research paper published is primarily _ (concern) with factors affecting employee performance.2、He slowed the bleeding by applying _ (press
4、) to the wounds until the police and ambulance arrived.3、As the economy develops, the _ (live) conditions of the people have been improved accordingly.4、We sincerely hope they can play a key role in protecting the _ (endanger) species being harmed.5、The government has taken a series of measures to p
5、rotect wild animals from _ (extinct).6、Education has been given a high-priority _ (rate) by the new administration.7、We must find a way to resolve these problems _ it is too late.8、Many people travel to the country on tourist visas, and then stay and work there _ (illegal).9、Branagh won two awards f
6、or his screen _(adapt) of Shakespeares Henry the Fifth.10、The supplies were transported to the local people _ (immediate) the earthquake happened.三、完成句子1、我们应该学会和自然和睦相处。We should learn to _ _ _ _ nature.2、我祝贺你英语取得如此大的进步。I congratulate you on your _ _ _ _ in English.3、我很欣赏那些运动员在压力之下表现出的优雅。I appreciate
7、 the athletes who show grace _ _.4、We must _ (采取必要的措施) to prevent the rivers from being polluted.5、Wild animals _ (正在被猎杀) and their habitats are getting smaller and smaller.四、选词填空用方框内所给短语的适当形式完成下面的句子adapt to, die out, in danger, make progress, make out, on average, remind.of, watch over1.Seeing the
8、film, everyone who was watching it _ his own childhood.2._, men still earn more than women.3.Im glad that you _ in English in the last two months.4.The policemen believe that their lives are _, so they are rushing to their rescue.5.I heard the voices, but couldnt _ what they were saying.6.The wild p
9、opulation of koalas is faced with _.7.The guards were originally hired to _ the houses as they were being built.8.The world will be different, and we will have to be prepared to _ the changes.Part II 提高部分一、阅读理解How does an ecosystem(生态系统) work? What makes the populations of different species the way
10、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 such models, scientists have found out some key principles operating in food webs. Most food webs, for instance, c
11、onsist 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 species, they are weakly linked. Food webs may be dominated by many weak links because that arrangement
12、is more stable over the long term. If a predator can eat several species, it can survive the extinction of one of them. And if a predator can move on to another species that is easier to find when a prey species becomes rare, the switch allows the original prey to recover. The weak links may thus ke
13、ep 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 ecosystems. In the 1960s, scientists proposed that predators at the top of a food web had a surpris
14、ing 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 to be true. In the ocean, we fished for top predators such as cod on an industrial scale, while
15、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 would tell us when to adapt human activities that are pushing an ecosystem toward a break
16、down 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. What have scientists discovered with the help of mathematical models of food webs?A. Th
17、e 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.2. A strong link is found between two species when a predator _.A. has a wide food choi
18、ceB. can easily find new preyC. sticks to one prey speciesD. can quickly move to another place3. What will happen if the populations of top predators in a food web greatly decline?A. The prey species they directly attack will die out.B. The species they indirectly attack will turn into top predators
19、.C. The living environment of other species will remain unchanged.D. The populations of other species will experience unexpected changes.4. How does an early-warning system help us maintain the ecological balance?A. By getting illegal practices under control.B. By stopping us from killing large pred
20、ators.C. By bringing the broken-down ecosystems back to normal.D. By signaling the urgent need for taking preventive action.二、完形填空 Early spring can be a tough time in the Midwest. It can 1 both people and animals with its unexpected snowstorms. Every spring, migratory(迁徙的) birds camp out in a large
21、pond near my house on the way to their summer 2 . This year, besides geese, scaups, a type of diving duck spent days hanging out 3 eats. Then a snowstorm hit, followed by a very 4 night. The next morning, I was shocked to see that all birds had 5 overnightexcept one lone female, who was diving 6 and
22、 dynamically in the circle of open water. Her movement and body heat had kept the 7 from coming close as I 8 her from my warm house. However, as the temperature dropped, the open water got smaller, and her movements slowed. I watched with 9 as she eventually stopped moving, fearing that something mi
23、ght happen. And then it happened: Two more ducks appeared, 10 next to her still body. More ducks came and the circle of water came alive with their splashing and diving. Slowly, the circle of water 11 in size. Within minutes, the lone female was revived by her friends presence. This little duck woul
24、dnt have 12 another night without her friends. She, in turn, had kept that area of water 13 , so her friends had a place to stop and 14 themselves. Sometimes, a tiny actioneven our mere 15 might brighten ones day, and even save ones life.1、A.scareB.moveC.surpriseD.beat2、A.campB.vacationsC.coursesD.h
25、abitat3、A.regardless ofB.in search ofC.in addition toD.as for4、A.darkB.starryC.peacefulD.freezing5、A.gatheredB.disappearedC.panickedD.fainted6、A.energeticallyB.patientlyC.calmlyD.cautiously7、A.iceB.houseC.snowstormD.water8、A.tendedB.followedC.watchedD.recorded9、A.reliefB.doubtC.anxietyD.pleasure10、A
26、.rowingB.landingC.circlingD.feeding11、A.increasedB.decreasedC.transformedD.formed12、A.sparedB.wastedC.spentD.lasted13、A.stillB.openC.cleanD.steady14、A.motivateB.remindC.judgeD.refresh15、A.presenceB.appreciationC.attitudeD.request三、语法填空 A pretty girl had always looked forward to 1._(help) endangered
27、species of wildlife. One day a flying carpet took her to a 2._(distance) land in Tibet where she saw an antelope looking sad. It told her that they were being killed for the wool beneath their stomachs. As a result, they are now an 3._(endanger) species. Then the flying carpet took the girl to Zimba
28、bwe, 4._ she burst into laughter in relief. There an elephant told her that they 5._(use) to be an endangered species. 6._ that their numbers were increasing with the governments help. The girl smiled when she heard that so many things 7._(do) there to save local wildlife, which showed the 8._(impor
29、tant) of wildlife protection. 9._(final), the flying carpet and she were in a thick rainforest, where a monkey was protecting itself 10._ mosquitoes by rubbing an insect over his body. The monkey also told her to pay more attention to the rainforest and appreciate how the animals live together.四、书面表
30、达假如你叫李华,你所生活的城市周围有很多动植物正逐渐减少,请你对此现象向有关部门写一封信,分析造成这种现象的原因,并根据实际情况提出几条切实可行的建议。以下几条要点需包括在内: 1.野生动植物的现状; 2.分析造成许多野生动植物濒临灭绝的原因; 3.提出几条保护野生动植物的具体措施。注意: 1.不可遗漏要点,可适当增加细节,以使行文连贯; 2.词数80左右,开头和结尾已给出,不计入总词数。Dear Sir or Madam, Im writing to give some suggestions to protect the wildlife living in and around our
31、city._ I hope my suggestions are of much help.Yours sincerely,Li Hua参考答案Part I一、1、endanger 2、hunters 3、alarm 4、average 5、habitats6、posters 7、species 8、immediately 9、illegal 10、extinction二、1、concerned 2、pressure 3、living 4、endangered 5、extinction6、rating 7、before 9、adaptation 10、immediately三、1、live i
32、n harmony with2、making such great progress3、under pressure4、take necessary measures5、are being hunted四、1. was reminded of 2. On average 3. have made progress 4. in danger 5. make out 6. dying out 7. watch over 8. adapt toPart II一、1-4 BCDD二、1-5.CDBDB 6-10.AACCB 11-15.ADBDA三、1.helping 2.distant 3.enda
33、ngered 4.where 5.used 6.and 7.were being done 8.importance 9.Finally 10. from四、答案：Dear Sir or Madam, Im writing to give some suggestions to protect the wildlife living in and around our city. As we know, many species of wildlife are in danger of extinction. This is because the environment that they
34、are living in has been destroyed greatly. With the development of cities, water and air are seriously polluted. Their living areas are becoming smaller and smaller. They not only have little to cat, but also can be killed by human beings. These species of wildlife are important part of our life. Per
35、sonally, more measures should be taken to protect them from being hurt. Firstly, more laws must be made to stop people from cutting down trees. Secondly, all the factories must clean the waste water before it is poured into rivers or lakes. Thirdly, more reserves should be set up so that they can live safely. I hope my suggestions are of much help.Yours sincerely,Li Hua
