The moon, being much nearer to the Earth than the Sun, is the______cause of the tide.

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问题 The moon, being much nearer to the Earth than the Sun, is the______cause of the tide.

选项 A、principal
B、basic
C、initial
D、elementary

答案A

解析 在给出的选项中:principal意为“主要的,重要的”;basic意为“基本的”;initial意为“最初的”;elementary意为“基本的,初级的”。根据句意和各个选项的意思可知,正确答案是A。
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