Long ______ to harmful pollutants is most likely to lead to a decline in health.

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问题 Long ______ to harmful pollutants is most likely to lead to a decline in health.

选项 A、contact
B、touch
C、use
D、exposure

答案D

解析 这里的意思是“长期接触有害污染物……”,exposure to表示了这一概念。
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