2. 外语
  3. The moon, being much nearer to the Earth that the Sun, is the______cause of the tides.

The moon, being much nearer to the Earth that the Sun, is the______cause of the tides.

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问题 The moon, being much nearer to the Earth that the Sun, is the______cause of the tides.
选项 A、principal
B、basic
C、initial
D、elementary
答案A
解析 形容词辨析题。principal意为“主要的”。例如：My wages are the principal source of my income．(薪金是我收入的主要来源。)正是月亮的运转引起涨潮和退潮，故[A]符合文意。basic意为“基础的”；initial意为“最初的”；elementary意为“基本的”，这三个词都没有体现出潮汐出现的主因是月亮这层含义，不符合常识，排除。
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