問題詳情
31 Roughly 4.5 billion years ago, a planetary embryo the size of Mars _______ into Earth, ripping off Earth's outerlayers and sending a cloud of molten debris into orbit.
(A)converted
(B)slammed
(C)tucked
(D)evolved
參考答案
答案：B
難度：適中0.483871
統計：A(4),B(15),C(7),D(5),E(0)
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