[外语类试卷]专业英语八级(阅读)练习试卷18及答案与解析.doc
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1、专业英语八级(阅读)练习试卷 18及答案与解析 0 There can be few more depressing stories in the entire history of mans exploitation of nature than the destruction of the unfortunate great whales. The whales have not only suffered untold cruelty but now face total extermination. Already entire populations have been wiped
2、out, and the only reason why no species has yet been finished off is due to the vastness and inaccessibility of the oceans; a pocket or two somewhere has always managed to escape. How ironic of biological extinction were to complete the job. The basic rule of extinction is very simple: it occurs whe
3、n a species mortality is continually greater than its recruitment. There are though, some very special additional factors in the case of whales. Man does not actually have to kill the last whales of a species with his own hands, as it were, to cause its disappearance. Biological extinction will quic
4、kly follow the end of commercial whaling, should that end be due to a shortage of raw material, i. e. of whales. Whalers have long sought to defend their wretched trade by insisting that whales are automatically protected: as soon as they become rare, and therefore uneconomic to pursue, man will hav
5、e no choice but to stop the bunting. That is a very nice theory, but it is the theory of an accountant and not of a biologist; only an accountant could apply commercial economics to complex biological systems. The reasons for its absurdity are many and varied. In the case of whaling it can be summed
6、 up in the following way. When the stock has been reduced below a critical level, a natural, possibly unstoppable downward spiral begins because of three main factors. First, the animals lucky enough to survive the slaughter will be too scattered to locate one another owing to the vastness of the oc
7、eans. Secondly, whales being sociable animals probably need the stimulus of sizeable gatherings to induce reproductive behaviour (which has social inferences as well as sexual). It is quite likely that two individuals meeting through chance will not be compatible. (They can hardly be expected to be
8、aware of their own rarity or to realize any need for adjusting their natural inclinations.) This is especially so with polygamous species like the Sperm Whale. Thirdly, and perhaps most important in the long term, even allowing that the whales might still be able to band together in socially accepta
9、ble groups (thanks to their undeniably excellent communicative systems), there is a real danger, possibly even a probability, that the whales gene pools would by then have sunk so low as to be biologically unviable. That is to say, the characteristics possessed by the original population would be wh
10、ittled down to those characters possessed by only the few remaining individuals. The result of such a biological calamity is inbreeding, less ability to adapt to new conditions, and less individual variety. Three words can sum it up: protracted biological extinction. The future “hopes“ of these anim
11、als are further discussed in the final chapter. 1 Whalers argue that whales will not become extinct _. ( A) because they are not self-protected ( B) because they are not worth pursuing ( C) because the oceans are so vast ( D) because hunting will stop when whales become rare 2 Many species of whales
12、 will not breed unless _. ( A) they are in the same group for a long term ( B) they are isolated from other species ( C) they are in the company of many other whales ( D) there are enough genes available 2 If you are interested in unusual exports, North Carolina will appeal to you. More than 200 peo
13、ple convicted in the states courts are now incarcerated in Rhode Island or Oklahoma. The governor of North Carolina, James Hunt, has asked the legislature to authorize the housing of a total of 1,000 convicts in other states prisons. A temporary measure, explain state officials, until the pressure o
14、n their own prisons eases. Yet the mind turns to 18th century Britains shipping of convicts to Australia, and to James Oglethorpes establishment of the colonys Georgia in part as a refuge for people released from debtors prisons. Todays America is dotted with prisons recently built either as private
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