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  3. The doctor explained to the students the hazards of radiation upon human beings.

The doctor explained to the students the hazards of radiation upon human beings.

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问题 The doctor explained to the students the hazards of radiation upon human beings.
选项 A:dangers       
B:evils
C:impacts       
D:benefits
答案A
解析本句的句意是：医生向学生解释了辐射对人类产生的危害。本题的四个选项中，选项C为中性词，表示“影响”；选项D指好的事情，表示“益处”；选项A和选项B都表示坏事。但evil有“恶意”的意思，不合适。所以选项A是正确答案。
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