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  3. Passage Four Why did Dr. Wrangham conduct the experiment on rats which did not rely on cooking?

Passage Four Why did Dr. Wrangham conduct the experiment on rats which did not rely on cooking?

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问题 Passage Four
Why did Dr. Wrangham conduct the experiment on rats which did not rely on cooking?
选项
答案To test whether softness of food alone would affect absorption·
解析 根据题干关键词定位到第八段，第八段中介绍的这项没有使用烹饪的实验是为了论证第六段中提出的烹饪给食品带来的第三种变化：将食品软化，从而减少为了消化食物所耗费的能量。通过这一与烹饪无关的实验可知，其中体重增加的老鼠所吃的食物除了更柔软之外，和标准食物小球没有任何不同，所以在分析实验结果时可以排除其他因素的干扰，放心地进行这样的推断：食物的软硬程度能明显影响体重，因此答案是To test whether softness of food alone would affect absorption。
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