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慎到

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参考答案：D

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题型：阅读理解

阅读理解

     Weighing too much can damage your health, and fatness is a growing problem for both kids and adults around the world.

     Sleep might be one answer to the problem. A new study has found that elementary school students who slept too little were more likely to gain pounds.

     Past studies have shown a link between sleeping less and weighing more, but scientists have had a

tough time determining "which came first, the chicken or the egg," says Julie C. Lumeng of the University of Michigan.

     To get a better idea of which causes which, Lumeng and colleagues interviewed the parents of 785

third graders from around the United States. The parents answered questions about how well their kids

slept that year. Three years later, the parents answered the same questions.

     By sixth grade, 18 percent of kids involved in the study were obese (肥胖的) . The scientists found no relationship between weight and the students' race or gender (性别). It also didn't matter how strict their

parents were, or whether they were boys or girls. Obesity struck all of these groups equally.Instead, sleep seemed to be the key factor. Over the 3 years of the study, the children averaged a healthy 9.5 hours of

sleep a night. Some kids, however, slept a lot more-- or less-- than others.

     For the sixth graders, every hour of sleep above the 9.5-hour average was linked to a 20 percent lower risk of being obese. Sleep appeared doubly important for the third graders. Every extra hour of sleep they got was linked to a 40% drop in obesity by sixth grade.

     "I expected we'd find that this sleep link with obesity was just a bunch of nonsense." says Lumeng, a

pediatrician (儿科医生). But their findings were convincing. No matter how her team looked at the link, "we couldn't make it go away."

1.Which of the following statements is TURE?

A.More and more kids put on weight.

B. 18% of the six graders were very fat.

C.9.5 hours of sleep a night is harmful.

D. Parents should be strict with their children.

2. We can infer from the passage that            .

A. the sixth graders need more sleep than the third graders

B. the third graders need more sleep than the sixth graders

C. boys and girls were quite different in sleeping hours

D. after three years' study, the children had healthy sleeping hours

3. What does the word "it" in the last line of the last paragraph refer to?

A. Julie C. Lumeng's team.

B. The conclusion of the study.

C. The relation between less sleep and less weight.

D. The relation between more sleep and less weight.

4. What is the best title for the passage?

A. Sleeping is Important

B. Over Sleeping is Harmful

C. Less Sleep, More Weight

D. More Sleep, More Weight
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