Growing levels of pollution represent a serious health hazard to the local population.

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问题 Growing levels of pollution represent a serious health hazard to the local population.

选项 A、protection
B、indication
C、immunity
D、danger

答案D

解析本句意思：日益严重的污染对当地人民的健康构成了重大威胁。hazard危险，危害。protection保护，防卫；indication表明，标示，象征，显示；immunity免疫力，豁免，免除；danger危险，危险物，威胁。

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