The total quantity of water is not known, and it is about enough to cover the surface of the globe to depth of about two and thr

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问题 The total quantity of water is not known, and it is about enough to cover the surface of the globe to depth of about two and three-quarter kilometers.

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答案连词误用,应把第一个and改为but。

解析 上文提到“水的总量虽不知道”,下文说“但它足够覆盖地球表面了”,因此上下文之间是转折关系,而不是并列关系。
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