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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热门试题

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

单项选择题

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 changes