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【题目】The stretches of mountains are the natural _____ between the two countries.

A. position B. barrier

C. regulation D. approach

【答案】B

【解析】

试题分析:句意:延伸的山脉成为两国的天然屏障。A项表示位置B项是障碍,阻碍C项表示规章,条例D项是方法之意,故选B

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