2. 外语
  3. The Moon, being much nearer to the Earth than the Sun, is the________cause of the tides.

The Moon, being much nearer to the Earth than the Sun, is the________cause of the tides.

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问题 The Moon, being much nearer to the Earth than the Sun, is the________cause of the tides.
选项 A、principal
B、basic
C、initial
D、elementary
答案A
解析 月亮距离地球比太阳距离地球近得多，它是潮汐出现的主要原因。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。)根据句意和常识可知，主要是月亮的运转引起涨潮和退潮，故A项为答案。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，故均排除。
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