There are new findings that not enough sleep may cause people to gain weight. Researchers say a lack of sleep can produce hormonal(激素的) changes that increase feelings of hunger.
In one study, researchers in the United States examined information on more than 1000 people. The people had taken part in a long-term study of sleep disorders.
Some people slept less than five hours a night. They had 15 percent higher blood levels of a hormone called ghrelin than people who slept eight hours. And they had 15 percent less of the hormone leptin. Experts say ghrelin helps make people feel hungry; leptin makes you feel full.
The scientists say these hormonal changes may be a cause of obesity in Western societies. They note the combination that sleep limitation is common and food is widely available.
The results were not affected by how much people exercised. People who are awake longer have more time to burn energy. But the researchers say loss of sleep may increase hunger especially for high-calorie foods, so people gain weight. It seems that, for survival, the body may be designed to store more fat during times with less sleep.
Researchers from Stanford University in California and the University of Wisconsin did the study. They found that the best amount of sleep for weight control is 7.7 hours a night.The Public Library of Science published the findings in its journal Medicine . Internet users can read the full study, free of charge, at plos. org.
【小題1】Not enough sleep can cause obesity by ______.

A．burning more of your energy
B．making you want to eat more food
C．keeping you from doing exercise
D．helping you feel great without food
【小題2】When you sleep 7.7 hours a night, you will ______ .
A．have your ghrelin level rise and leptin level drop
B．have your leptin level rise and ghrelin level drop
C．have your ghretin and leptin levels properly balanced
D．have your hunger increase and your weight decrease
【小題3】You can read the findings________
A．Only on the Internet
B．only in Medicine
C．Both on the Internet and in Medicine
D．Neither on the Internet nor in Medicine


【小題1】B
【小題2】C
【小題3】C

解析試題分析：本文介紹了一個(gè)新的科學(xué)發(fā)現(xiàn)，即睡眠不足會(huì)導(dǎo)致人體肥胖。研究表明在缺少睡眠的情況下，人體會(huì)產(chǎn)生一種叫做ghrelin的激素，會(huì)使人產(chǎn)生饑餓感，因而食欲旺盛繼而導(dǎo)致肥胖，而且鍛煉對(duì)于這種因睡眠不足造成的肥胖沒(méi)有影響。
【小題1】B細(xì)節(jié)理解題。從文章倒數(shù)第二段the researchers say loss of sleep may increase hunger especially for high-calorie foods, so people gain weight.得知睡眠不足會(huì)造成饑餓感，使人們想吃更多高熱量的食物，因此導(dǎo)致肥胖，所以B選項(xiàng)正確。
【小題2】C推理判斷題。從文章第二段可知缺少睡眠人體會(huì)產(chǎn)生讓人感到饑餓的ghrelin，而睡眠充足的話人體會(huì)產(chǎn)生讓人有飽腹感的 leptin，而且從文章最后一段They found that the best amount of sleep for weight control is 7.7 hours a night可知睡眠7.7小時(shí)是能控制體重的最佳時(shí)間，也就是在7.7小時(shí)內(nèi)人體產(chǎn)生的ghretin 和 leptin保持平衡。所以C選項(xiàng)正確。
【小題3】C細(xì)節(jié)理解題。從文章末句The Public Library of Science published the findings in its journal Medicine . Internet users can read the full study, free of charge, at plos. org.可知研究結(jié)果在雜志和網(wǎng)上都可以看到。所以C選項(xiàng)正確。
考點(diǎn)：考查科普知識(shí)類短文閱讀。

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