【題目】More of us are using headphones in noisier environments, ______ we may turn up the volume to potentially dangerous levels.

A. when B. while C. before D. where

【答案】D

【解析】

考查定語從句。句意：我們中越來越多的人在噪音更大的環(huán)境中使用耳機，這樣我們可能會把音量調(diào)到潛在危險的水平。此處environments做先行詞，在后面的非限制性定語從句中作地點狀語，故答案為D。

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