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:Which would be a point supported by the reported findings?
The more you sleep, the farther away you are from obesity.
Those who don’t sleep at all are the most likely to put on weight.
Sleeping contributes more to obesity than eating.
It’s not wise to use sleep hours for exercise.
小題3:When you sleep 7.7 hours a night, you will ______ .
have your ghrelin level rise and leptin level drop
have your leptin level rise and ghrelin level drop
have your ghretin and leptin levels properly balanced
have your hunger increase and your weight decrease
小題4:The writer wrote this passage to _______ .
A．make a news report
B．offer a piece of medical advice
C．make an advertisement
D．keep a record of the old findings
小題5: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:D
小題3:C
小題4:A
小題5:C

試題分析：
小題1:B 推理題。根據(jù)文章第一段第二行Researchers say a lack of sleep can produce hormonal(激素的) changes that increase feelings of hunger說明缺少睡眠會讓人感覺餓，會增加人的食欲。故B正確。
小題2:D 細節(jié)題。根據(jù)第五段2,3行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.說明把睡眠的時間拿來鍛煉并不是好主意，因為睡眠少會讓人發(fā)胖。
小題3:C 細節(jié)題。根據(jù)文章倒數(shù)第二段They found that the best amount of sleep for weight control is 7.7 hours a night.說明7.7個小時的睡眠是最好的，即這種睡眠可以讓你有恰當?shù)暮蔂柮傻姆置凇９蔆正確。
小題4:A 推理題。根據(jù)文章最后一段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.說明這是一份新聞報告。故A正確。
小題5:C推理題。根據(jù)文章最后一段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.說明在journal Medicine和網(wǎng)站上都可以看到這篇文章。故C正確。
點評：本文是一篇關于睡眠不足引起人的健康問題的新聞報告。集中考查了推理題，難度較大，要求考生在認真審題的基礎之上進行合理的推理。尤其是57,58兩題。
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A．Rainer Wendt’s warning went unnoticed
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