If the drug proves effective in human trials, it could enhance the effectiveness of existing AIDS drugs in ______. Why would an

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问题 If the drug proves effective in human trials, it could enhance the effectiveness of existing AIDS drugs in ______.
Why would anti-AIDS drugs stop working?

选项

答案Because the virus changes its shape.

解析 根据题干中的关键词anti-AIDS drugs和stop working定位到倒数第六段,可知现有的抗艾滋病药物最终就不会起作用了,因为病毒改变了形状,故可得答案。
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