单项选择题

Evidence of past climatic changes indicates that______.

A．human activities have accelerated changes of Earth's environment
B．Earth's environment will remain mild despite human interference
C．Earth's climate is bound to change significantly in the future
D．Earth's climate is unlikely to undergo substantial changes in the future
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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
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
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