2. 考研
  3. 　　Have you noticed a desire to eat more when your sleep becomes short? We know the reasons why.【B1】________sleep suppresses a ho

　　Have you noticed a desire to eat more when your sleep becomes short? We know the reasons why.【B1】________sleep suppresses a ho

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问题 　　Have you noticed a desire to eat more when your sleep becomes short? We know the reasons why.【B1】________sleep suppresses a hormone that signals food【B2】________, yet【B3】________concentrations of the hormone ghrelin that makes you feel hungry.【B4】________having eaten enough and being full, you will still want more.
　　It’s not just about hormonal changes in your body. Your brain’s【B5】________to food changes when you are【B6】________sleep. Several years ago, my team and I scanned the brains of【B7】________weight individuals as they were choosing which items they wished to eat from a range of foods. We had these【B8】________do this twice; once after a full night of sleep, and once after being lack of sleep for a night. The brain scans demonstrated that regions in the prefrontal cortex that are required for controlled decisions had been switched【B9】________by the sleep loss. In contrast, a more primal deep-brain structure, which【B10】________hedonic motivations including food desires, was【B11】________
　　You can now see why a person’s waistline will【B12】________if sleep becomes【B13】________short, as they may be reaching for pizza or doughnuts,【B14】________whole grains or leafy greens.【B15】________still, when you are not sleeping enough, your body becomes【B16】________in giving up its fat stores and becomes more than willing to give away muscle.【B17】________, you keep what you want to lose, and lose what you want to keep.
　　The silent sleep-loss epidemic may be a key【B18】________ to the obesity epidemic afflicting so many societies. Each of us has the choice to turn the table【B19】________all this research by【B20】________better sleep habits.
【B18】
选项 A、benefactor
B、contributor
C、distributor
D、trigger
答案[B]
解析 本题考查名词辨析。四个选项分别为[A]benefactor“捐款人，赞助人”；[B]contributor“促成物，促成因素”；[C]distributor“经销商，分销商”；[D]trigger“(尤指引发不良反应或发展的)起因，诱因”。根据对该句话以及上下文的理解，睡眠不足是导致肥胖的一个关键因素。contributor意为“促成物，促成因素”，符合句意。故选项[B]正确。
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考研英语一

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