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【題目】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：人類正在慢慢污染整個世界，沒有足夠的清潔空氣或水。我們必須采取行動，否則情況會更糟。考查連詞辨析題。and和or都是連詞。and和，表并列；or或者，表選擇；并列結構中，or通常用于否定句，and用于肯定句。or還用于連接兩個并列的句子，意思是“否則”。there is not enough clean air or water.是否定句，根據句意，故選D。

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