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But when the mice were well-fed, they stayed in areas of the cage that were considered "safe".
2018年6月四级真题(第二套)听力 Section C
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However, when the mice were well-fed but thirsty, they opted to drink, according to the study.
2018年6月四级真题(第二套)听力 Section C
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In one experiment, the mice were both hungry and thirsty.
2018年6月四级真题(第二套)听力 Section C
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In the second experiment meant to pit the mice's hunger against their fear, hungry mice were placed in a cage that had certain "fox-scented" areas and other places that smelled safer but also had food.
2018年6月四级真题(第二套)听力 Section C
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It turned out that, when the mice were hungry, they ventured into the unsafe areas for food.
2018年6月四级真题(第二套)听力 Section C
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Large mammals once wandered the volcano's slopes, but today, foxes, wild cats, rabbits and mice are more common.
2019年6月四级真题(第二套)听力 Section C
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mice are usually social animals and prefer to be in the company of other mice, according to the study.
2018年6月四级真题(第二套)听力 Section C
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So some animals, such as mice, collect extra food before winter, and hide it.
2017年6月四级真题(第二套)听力 Section C
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When given the choice of either eating food or drinking water, the mice went for the food, the researchers found.
2018年6月四级真题(第二套)听力 Section C
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When the mice were hungry, they opted to leave the company of other mice to go get food.
2018年6月四级真题(第二套)听力 Section C