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

A. position B. barrier

C. regulation D. approach

【答案】B

【解析】

試題分析：句意：延伸的山脈成為兩國的天然屏障。A項(xiàng)表示“位置”；B項(xiàng)是“障礙，阻礙”；C項(xiàng)表示“規(guī)章，條例”；D項(xiàng)是“方法”之意，故選B。

考點(diǎn): 考查名詞

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