Roughly 4.5 billion years ago, a planetary embryo the size of Mars _______ into Earth, ripping off Earth's outer layers and sending a cloud of molten debris into orbit.
Aconverted
Bslammed正確答案
Ctucked
Devolved
答案與詳解
slammed into 意為「猛烈撞擊、重擊」,精確描述火星大小的行星胚胎高速撞擊地球的場景,與後文 ripping off、sending debris 等劇烈動作呼應,為正確答案。
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