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【题目】Humans are slowly polluting the whole world and there is not enough clean air _______ water. We must take action, _______ things will be worse.

A. and; and B. or; and C. and; or D. or; or

【答案】D

【解析】句意:人类正在慢慢污染整个世界,没有足够的清洁空气或水。我们必须采取行动,否则情况会更糟。考查连词辨析题。andor都是连词。and和,表并列;or或者,表选择;并列结构中,or通常用于否定句,and用于肯定句。or还用于连接两个并列的句子,意思是“否则”。there is not enough clean air or water.是否定句,根据句意,故选D。

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