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【题目】There is _____ river at the foot of the mountain(山)._____ river is dangerous.

A.a; A B.a; The

C.the; The D.the; A

【答案】B

【解析】

试题分析:句意:在山脚下有一条河,这条河很危险。a / an 用在单数可数名词前面,表示这个人或事物是泛指的不确定的一个,相当于中文的“一个”。a 用在读音为辅音开头的名词之前, an 用在读音为元音开头的名词之前。定冠词特指某(些)人或某(些)事物。 如果第一次提到某人或事物的时候,用a / an,那么以后再提到的话,就变成特指的人或事物了。结合句意,故选B

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