Not getting enough sleep doesn't just make you tired. It also makes you fat because of increased food-eating, according to researchers in America.

　　The researchers 1 a study which included eight men and eight women, and found that participants who lacked sleep for a week 2 　almost two pounds.

　　To establish a standard, 3 spent the first three nights sleeping up to nine hours a night, and 4 　 only as many calories as they burned each day. Their daily amount of food and oxygen, and production of carbon dioxide were 5　　.

　　Then participants 　 6 　 two groups, with one limited to sleeping five hours a night, while the other continued to be allowed nine hours. After five nights, the groups　 7 　. During this part of the experiment, participants were allowed to eat as much as they wanted.

　　The researchers found that participants burned about 5 percent more calories when their sleep 8 　 five hours, but they consumed about 6 percent more calories, 　9 　when they were allowed nine hours.

　　Although the participants ate less at breakfast when they had five hours of sleep, they ate more over the rest of the day; they 10 consumed an increased number of calories after the dinner and finally gained weight. When they shifted to adequate sleep patterns they lose the pounds.

　　【答案解析】

　　1.carried out。【精解】空格处应该填入一个动词或动词短语，carried out意为“进行，实行”。该句意为，研究人员进行了一项研究。

　　2.ganined。【精解】空格处应该填入一个动词，其宾语为two pounds。gained意为“获得，增加”。该句意为：缺乏睡眠的受试者体重增加了近两磅。

　　3.particilmnls。【精解】空格处应该填入一个名词，作谓语动词spent的主语。本段后面全用了they，表示主语是复数，下一段的开头提到Then participants were divided into two groups，因此空格处应填participants。

　　4.consumed。 【精解】空格处应填入一个动词，该动词的宾语为calories。consumed意为“消耗”。该句的意思是：这些受试人员每天消耗多少热量，他们就吃多少热量的食物。

　　5.mersured。 【精解】空格处应填入一个动词的过去分词形式，与前面的were构成被动语态，measure意为“测量”。该句的意思是：这些受试人员每天的食物和氧气的摄人量以及二氧化碳的呼出量都被测量过。

　　6.were divided into。【精解】空格处应该填入动词的被动语态，were divided into意为“被分成”。该句的意思是：受试人员被分成两组。

　　7.switched。 【精解】空格处应该填入一个动词，作the groups的谓语。switched表示“对调，转换”。该句的意思是，五个晚上以后，这两组人员对调了一下。

　　8.WilS limited to。 【精解】空格处应该填入一个动词短语，且应为被动语态。Was limited t0表示“被限定为”。该句的意思是：当他们的睡眠时间被限定为5小时时……。

　　9.compared with。 【精解】空格处应该填入一个动词的过去分词形式，表示比较。Compared with表不“与……相比”。根据上下文可知，这里将每晚睡5个小时和每晚睡9个小时的情况进行对比。

　　10.espectsllUy。【精解】空格处应该填入一个副词，用来修饰动词consumed。

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