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  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.

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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 accretion积聚。
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