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【题目】The river that is seriously polluted is________ danger to the villagers.

A. a B. an C. the D. /

【答案】A

【解析】句意:污染严重的河流对村民来说是个危险。danger名词,泛指一般意义的“危险”,通常是不可数名词;表示具体意义的造成危险的原因或人(物)等,或指威胁、危害等,是可数名词。故选:A。

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