2. 外语
  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.

admin2009-06-15  59
问题 The doctor explained to the students the hazards of radiation upon human beings.
选项 A、dangers
B、endeavours
C、bachelors
D、benefits
答案A
解析
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