题目内容

14．Many experts believe that teachers'development is _______ the key to better education lies．（　　）
A．thatB．whatC．whereD．which

分析 许多专家认为老师的发展是更好的教育的关键所在．

解答 答案：C．根据 teachers'development is说明后面整句是表语从句，而表语从句 the key to better education lies可知句子不完整，缺lie in"在于…"后的地点状语，故选C．

点评 本题考查表语从句的连接词，在充分分析句型以及了解短语lie in"在于…"基础上便能选出正确答案．如果后面有in的话就用what．

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4．How do predators （猎食动物） affect populations of the prey （猎物） animals？The answer is not as simple as might be thought．The Moose（麋鹿） reached Isle Royale in Lake Superior by crossing over winter ice and bred freely there in isolation without predators．When wolves later reached the island，naturalists widely assumed that the wolves would play a key role in controlling the moose population．Careful studies have demonstrated，however，that this is not the case．The wolves eat mostly old or diseased animals that would not survive long anyway．In general，the moose population is controlled by food availability，disease and other factors rather than by wolves．
When experimental populations are set up under simple laboratory conditions，the predator often wipes out its prey and then becomes extinct itself．However，if safe areas like those prey animals have in the wild are provided，the prey population drops to low level but not extinction．Low prey population levels then provide inadequate food for the predators，causing the predator population to decrease．When this occurs，the prey population can rebound．In this situation the predator and prey population may continue in this cyclical pattern for some time．
Population cycles are characteristic of small mammals，and they sometimes appear to be brought about by predators．Ecologists studying hare populations have found that the North American snowshoe hare follows a roughly ten-year cycle．Its numbers fall tenfold to thirty in a typical cycle，and a hundredfold change can occur．Two factors appear to be generating the cycle：food plants and predators．
The preferred foods of snowshoe hares are tender willow branches．As the hare population increases，the quantity of these branches decreases，forcing the hares to feed on low-quality high-fiber food．Lower birth rates and low growth rates follow，so there is a corresponding decline in hare abundance．Once the hare population has declined，it takes two to three year for the quantity of branches to recover．
A key predator of the snowshoe hare is the Canada lynx．The Canada lynx shows a ten-year cycle of abundance（大量） that parallels the abundance cycle of hares．As hare numbers fall，so do lynx numbers，as their food supply decreased．
Predators are an essential factor in maintaining communities that are rich and diverse in species．Without predators，the species that is the best competitor for food，shelter，and other environmental resources tends to dominate and exclude the species with which it competes．This phenomenon is known as"competitor exclusion"．However，if the community contains a predator of the strongest competitor species，then the population of that competitor is controlled．Thus even the less competitive species are able to survive．From the stand point of diversity（多样性），it is usually a mistake to eliminate a major predator from a community．

73．The author uses the example of the moose and wolves on Isle Royale toB．
A．provide evidence that predators influence prey populations
B．question the belief in the effect of predators on prey populations
C．demonstrate predator population grows faster than that of the prey
D．prove that studies of isolated populations tend to be useful
74．The word"rebound"in the passage is closest in meaning toD．
A．React
B．Resist
C．Remain
D．Recover
75．Which of the following is true according to the passage？A
A．Laboratory results can't explain the changes in predator and prey populations of the wild．
B．The growth of hare population may lead to a corresponding increase in its birth rates．
C．The experimental environments can promote the growth of predator and prey populations．
D．The existence of a major predator in a community is a threat to the diversity of species．
76．What can we conclude from the passage about the cycle of the Canada lynx？C
A．When hare numbers decrease，lynx numbers increase．
B．It has a great effect on the number of snowshoe hare．
C．It closely follows the cycle of the snowshoe hare．
D．It is not directly related to the availability of lynx food．
77．What is the best title of this passage？B
A．What role predators play in keeping competitor species．
B．Whether predators have an impact on prey populations．
C．A study of the populations of the predator and prey animals．
D．Contributing factors of the changes in animal populations．
5．工作人员为那些家园被毁的幸存者盖起了避难所．（用定语从句翻译）Workers built shelters for survivors whose homes had been destroyed．
2．我们花在作业上的时间很多．（spend）Wespendmuchtimeon（our）homework．/indoing（our）homework．．
9．The Smiths prefer a house in the country to spend their late years to____ in a large city．（　　）
A．oneB．itC．thoseD．this
19．He never makes a promise he doesn't intend to keep，so when he says forever，forever is ___________he means．（　　）
A．whatB．howC．whichD．that
6．For many cities in the world，there is no room to spread out further，__________ New York is an example．（　　）
A．for whichB．in whichC．of whichD．from which
3．除非你保持均衡的饮食，否则将会增加体重． （a balanced diet，put on weight ）
Unless you keep a balanced diet，you will put on weight．
4．At first，we didn't feel we belong here，but now weare attachedto（依恋） the land we live on．

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