2. 医学
  3. The scientists at the University of Bern in Switzerland have used a weakened virus that is not infectious and has proved safe an

The scientists at the University of Bern in Switzerland have used a weakened virus that is not infectious and has proved safe an

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问题 The scientists at the University of Bern in Switzerland have used a weakened virus that is not infectious and has proved safe and effective.
选项 A、dangerous
B、harmful
C、contagious
D、invading
答案C
解析 句意：瑞士伯尔尼大学的科学家们利用了一种衰弱了的病毒，它不具传染性，并已证明是安全有效的。infectious易传染的。contagious传染性的，会感染的。dangerous危险的。harmful有害的。invading入侵的。
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