It has been demonstrated that rats will, when given a choice over a period of time, prefer water with vitamins to water without

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问题 It has been demonstrated that rats will, when given a choice over a period of time, prefer water with vitamins to water without vitamins even though there is no difference in taste or smell between the two water bottles.

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答案有证据表明,在一段时间内,如果让老鼠去挑选的话,它们会选择含有维生素的水瓶,即使两瓶中的水在味道上并无差异。

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