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GRE阅读模拟练习题(6)

2017-04-26 07:44:22来源：网络

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　　That view was challenged in the 1960s, when studies of Moon craters revealed that these craters were caused by the impact of objects that were in great abundance about 4.5 billion years ago but whose number appeared to have quickly decreased shortly thereafter. This observation rejuvenated Otto Schmidt’s 1944 theory of accretion.

　　Which of the following best describes the “observation” (line 6) referred to in the passage?

　　A：The rocky planets were created by the rapid gravitational collapse of a dust cloud.

　　B：Certain features on the Moon’s surface are impact craters caused by collisions with objects such as planetesimals.

　　C：The rocky planets were formed by a slow accretion of cosmic dust into increasingly larger bodies.

　　D：The number of objects colliding with the Moon appears to have been high for a while and then rapidly diminished.

　　E：There are far fewer planetesimals in existence today than there were about 4.5 billion years ago.

　　答案：D

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