【題目】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:污染嚴(yán)重的河流對村民來說是個危險。danger名詞,泛指一般意義的“危險”,通常是不可數(shù)名詞;表示具體意義的造成危險的原因或人(物)等,或指威脅、危害等,是可數(shù)名詞。故選:A。

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