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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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They found that the majority of both kids and adults opted for a half-sized portion when combined with a prize.
2016年12月四级真题(第三套)阅读 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