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

<上一题目录下一题>

热门试题

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

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