2. 外语
  3. It is now generally assumed that the planets were formed by the accretion of gas and dust in a cosmic cloud.

It is now generally assumed that the planets were formed by the accretion of gas and dust in a cosmic cloud.

admin2010-01-13  47
问题 It is now generally assumed that the planets were formed by the accretion of gas and dust in a cosmic cloud.
选项 A、separation
B、reaction
C、accumulation
D、motion
答案C
解析
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