The moon, being much nearer to the Earth than the Sun, is the ______ cause of the tides. (2008年考试真题)

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问题 The moon, being much nearer to the Earth than the Sun, is the ______ cause of the tides. (2008年考试真题)

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

答案A

解析 principal意为“主要的”,例如:My wages are the principal souse 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符合句意。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运转这层含义,不符合常识,排除。
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