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17.Weighing too much can be bad for your health,and being fat is a growing problem for both kids and adults around the world.In the U.S today,about 9million children over the age of 6are fat.
Sleep might be one answer to the problem of being fat.Past studies have shown a relation between sleeping less and weighing more,but scientists have had a hard time deciding"which came first,the chicken or the egg?"
To get a better idea of which cause which,scientists interviewed the parents of 785third grade students about how well their kids sleep that year.Three years later,the parents answered the same questions.
By sixth grade,18% of these kids were fat.The scientists found no relationship between weight and the students'race or sex.It also didn't matter how strict their parents were,or whether they were boys or girls.Being fat is a problem of these group equally.
Instead,sleep seemed to be the main reason.For the six grade students,every night of sleep above the 9.5-hour average(平均) caused a 20% lower risk of being fat.Sleep appeared more important for the third grade students.One more hour of sleep they get led to 40% less in fatness before third grade.

66.What is main idea of the passage?C
A.Being fat is a growing problem      B.Scientists had a hard time in interviewing
C.Sleeping less causes weighing more
67.How many parents are interviewed?A
A.Just 785           B.about 150           C.about 9million
68.What is the reason for being fat?C
A.race or sex        B.parents             C.sleeping time.
69.Which is true about the six grade students according to the passage?B
A.Less than 40% of the six grade students became fat.
B.18% of the six grade students got fat.
C.20% of the six grade students slept over 9.5hours a night.
70.What is the suggestion for the third grade students?A
A.They should sleep for about 9.5hours every night.
B.One more hour of sleep a night can make them fat.
C.Eating chicken and egg is good for them.

分析 太重对你的健康有害,现在世界上变胖不仅成了大人的问题也成了小孩的问题.现在美国6岁以上的儿童大约有900万是胖子.
睡眠可能是变胖的原因之一,过去的研究已经表明了睡得少和胖得多的一种关系,但是科学家在决定哪个在前哪个在后上却是费了一番周折.
为了得到是哪个引起哪个的更好的观点,科学家采访了785个三年级学生的父母关于他们的孩子那年睡得怎样的情况.三年后父母们回答了同样的问题.
到了六年级时,这些孩子中的18%成了胖子.科学家们发现肥胖跟孩子的种族及性别无关,也跟父母的严厉与否无关.变胖只是这个群体等同的一个问题.
似乎相反,睡眠好像是主要的原因.对于六年级的孩子来说,平均每晚睡眠9.5小时,变胖的风险会降低20%.对于三年级的孩子来说睡眠好像更重要,三年级以前多睡一小时会降低40%的变胖风险.

解答 66.C 整篇短文谈论的是睡眠少会导致肥胖,故选C.
67.A 根据短文第三段To get a better idea of which cause which,scientists interviewed the parents of 785third grade students about how well their kids sleep that year.可知科学家采访了785个三个级学生的父母,故选A.
68.C 根据短文第四段The scientists found no relationship between weight and the students'race or sex.It also didn't matter how strict their parents were,or whether they were boys or girls.可知肥胖跟孩子的种族及性别无关,也跟父母的严厉与否无关,故选C.
69.B 根据短文第四段By sixth grade,18% of these kids were fat.可知到六年级时,这些孩子中的18%成了胖子,故选B.
70.A 根据短文末段For the six grade students,every night of sleep above the 9.5-hour average(平均) caused a 20% lower risk of being fat.Sleep appeared more important for the third grade students.可知睡眠对于三年级的孩子来说更重要,每晚不要少于9.5小时,故选A.

点评 本篇阅读涉及到主旨大意题,推理判断题及细节理解题,加强对文章的整体理解,理解文章主旨,进行正确地推理,还要注意细节的查找.

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