Employees in chemical factories are entitled to receive extra pay for doing hazardous work.

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问题 Employees in chemical factories are entitled to receive extra pay for doing hazardous work.

选项 A、poisonous
B、difficult
C、harmful
D、dangerous

答案D

解析 hazardous有危险的。poisonous有毒的,恶毒的;difficult困难的;harmful有害的;dangerous危险的。故答案选D。
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