The passage summarizes harmful effects of animal experiment. However, as animal experiment is indispensable in a number of areas

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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.
Recently, an animal-advocacy group casts doubt on the scientists’ claim that apes are used only for

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答案work of vital importance to humanity

解析 根据animal-advocacy将信息定位在文章倒数第二段中间。
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