研究生基础英语期末考试样卷(12)

研究生基础英语期末考试样卷

just as surely as it came to the mainland cities that are now shrouded（笼罩） by fly ash.

If the oil is killing the life along the coral heads, what must it not be doing to the phytoplankton（浮游植物群落） at sea which provide 70% of the oxygen we breathe? The lesson of our fouled beach is that we may not even have realized how late it is already. Mankind, because of his technology, may require far more space per person on this globe than we had ever thought, but it is more than a matter of a certain number of square yards per person. There is instead a delicate balance of nature in which many square miles of ocean and vegetation and clean air are needed to sustain only a relatively few human beings. We may find, as soon as the end of this century, that the final people choking to death. The technology --- the machine --- will then indeed have had its ultimate, mindless, all-unintended triumph over man, by destroying the atmosphere he lives in just as surely as you can pinch off a diver’s breathing tube.

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