大学英语六级阅读理解历年真题训练unit21_大学英语阅读

　　D) to abandon his original settlement

　　22. Earth scientists have come to understand that climate .

　　A) is going through a fundamental change

　　B)has been getting warmer for 10,000 years

　　C) will eventually change from hot to cold

　　D) has gone through periodical change

　　23. Scientists believe that human evolution .

　　A) has seldom been accompanied by climatic changes

　　B) has exerted little influence on climatic changes

　　C) has largely been effected by climatic changes

　　D) has had a major impact on climatic changes

　　24. Evidence of past climatic changes indicates that .

　　A) human activities have accelerated changes of Earths environment

　　B) Earths environment will remain mild despite human interference

　　C) Earths climate is bound to change significantly in the future

　　D) Earths climate is unlikely to undergo substantial changes in the future

　　25. The message the author wishes to convey in the passage is that .

　　A) human civilization remains glorious though it is affected by climatic changes

　　B) mankind is virtually helpless in the face of the dramatic changes of climate

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