Because memory weakens with age, for the experiment to be valid, it is important that a group to be tested for drug induced memory loss be compared with a control group.
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Ato be tested for drug induced memory loss be compared with
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Bbeing tested for memory loss induced by drugs are compared with
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Cbeing tested for drug induced memory loss should be compared to
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Dbeing tested for drug induced memory loss are to be compared to
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Ethat is to be tested for drug induced memory loss are to be comparable with
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显示答案
正确答案: A