单项选择题

Fanning emerged as a survival strategy because man had been obliged______.

A．to give up his former way of life
B．to leave the coastal areas
C．to follow the ever-shifting vegetation
D．to abandon his original settlement
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单项选择题
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
单项选择题
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 mill continue to develop in spite of the changes of nature
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