The passage summarizes harmful effects of animal experiment. However, as animal

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问题 The passage summarizes harmful effects of animal experiment. However, as animal experiment is indispensable in a number of areas, it might not be stopped or replaced by other alternatives. [br] In basic scientific research, the object is to understand how, say, the brain works rather than to develop a drug to ______ brain disease.

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答案 treat

解析 根据题目定位信息在第四部分第一句话。
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