【題目】The atmosphere gets thinner and thinner _______ the height increases.

A. when B. as C. while D. since

【答案】B

【解析】

試題分析：句意：隨著高度增加，大氣越來越稀薄。本句話中含有“伴隨著”的意思，D表示原因，不符合句意AC均無此意，故選B。

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