2. 外语
  3. A、If they don’t involve any risks. B、If they produce predictable side effects. C、When the urgent need for them arises. D、When te

A、If they don’t involve any risks. B、If they produce predictable side effects. C、When the urgent need for them arises. D、When te

admin2010-06-11  42
问题  
选项 A、If they don’t involve any risks.
B、If they produce predictable side effects.
C、When the urgent need for them arises.
D、When tests show that they are relatively safe.
答案D
解析
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大学英语六级

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