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
C) man has to limit his activities to slow down the global warming process
D) human civilization will continue to develop in spite of the changes of nature
参考答案
21. A 22.D 23.C 24.C 25.B
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