2.If the plan is successful,Earth will have a working life of ________ years.
A.12 billion B.6 billion
C.18 billion
D.24 billion
解析:选A。细节理解题。根据第二段中的“They say their plan could add another six billion years to the useful lifetime of our planet—effectively doubling its working life.”可知答案为A。
3.What serious problems might the plan cause according to the passage?
A.Earth might have deadly consequences and man might lose the Moon.
B.Earth might be moved too far away and man might be frozen to death.
C.The comet might hit Jupiter or Saturn and never return to Earth.
D.Earth’s working life might be greatly shortened.
解析:选A。细节理解题。根据倒数第二段的最后一句及最后一段中的“...if Earth was pushed out of its current position,it is most likely that Moon would be stripped away from Earth.”可知应选A。
4.What does the underlined word “compromise” mean?
A.Provide.
B.Benefit.
C.Share.
D.Endanger.
解析:选D。词义猜测题。根据画线词所在句的内容可知,太阳发出的热会让我们的生物圈陷入危险。故画线词与endanger同义。
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