There are new findings that not enough sleep may cause people to gain weight.Researchers say a lack of sleep can produce hormonal 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 limitation is common and 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:Which of the following shows the right way in which lack of sleep causes weight gain?
A．more ghrelin and less leptin→feeling hungry→eating more
B．feeling hungry→eating more→more ghrelin and less leptin
C．burning more energy→feeling hungry→eating more
D．more leptin and less ghrelin→feeling full→less exercise
小題2:The two words missing in the 4th paragraph should be “_________”and “_________”.
A．weight;sleepB．sleep;foodC．hunger;foodD．weight;work
小題3: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 ghrelin and leptin levels properly balanced
D．feel neither hungry nor full
小題4:The writer wrote this passage to_________.
A．make a news reportB．offer a piece of medical advice
C．make an advertisementD．keep a record of the research findings

小題1:A
小題2:B
小題3:C
小題4:A

小題1:第三段，睡眠與ghrelin的關(guān)系。
小題2:吃得多，長得胖。
小題3:見倒數(shù)第二段，專家的觀點(diǎn)。
小題4:由文章最后一段可知。
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科目：高中英語 來源：不詳 題型：完形填空


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科目：高中英語 來源：不詳 題型：閱讀理解

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?
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科目：高中英語 來源：不詳 題型：閱讀理解

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A. When to pick beets.             B. How to eat beets.
C. The uses of beets.              D. The taste of larger beets.
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