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.a(chǎn)bout 150           C.a(chǎn)bout 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 太重對你的健康有害,現(xiàn)在世界上變胖不僅成了大人的問題也成了小孩的問題.現(xiàn)在美國6歲以上的兒童大約有900萬是胖子.
睡眠可能是變胖的原因之一,過去的研究已經(jīng)表明了睡得少和胖得多的一種關(guān)系,但是科學(xué)家在決定哪個在前哪個在后上卻是費了一番周折.
為了得到是哪個引起哪個的更好的觀點,科學(xué)家采訪了785個三年級學(xué)生的父母關(guān)于他們的孩子那年睡得怎樣的情況.三年后父母們回答了同樣的問題.
到了六年級時,這些孩子中的18%成了胖子.科學(xué)家們發(fā)現(xiàn)肥胖跟孩子的種族及性別無關(guān),也跟父母的嚴(yán)厲與否無關(guān).變胖只是這個群體等同的一個問題.
似乎相反,睡眠好像是主要的原因.對于六年級的孩子來說,平均每晚睡眠9.5小時,變胖的風(fēng)險會降低20%.對于三年級的孩子來說睡眠好像更重要,三年級以前多睡一小時會降低40%的變胖風(fēng)險.

解答 66.C 整篇短文談?wù)摰氖撬呱贂䦟?dǎo)致肥胖,故選C.
67.A 根據(jù)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.可知科學(xué)家采訪了785個三個級學(xué)生的父母,故選A.
68.C 根據(jù)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.可知肥胖跟孩子的種族及性別無關(guān),也跟父母的嚴(yán)厲與否無關(guān),故選C.
69.B 根據(jù)短文第四段By sixth grade,18% of these kids were fat.可知到六年級時,這些孩子中的18%成了胖子,故選B.
70.A 根據(jù)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.可知睡眠對于三年級的孩子來說更重要,每晚不要少于9.5小時,故選A.

點評 本篇閱讀涉及到主旨大意題,推理判斷題及細(xì)節(jié)理解題,加強(qiáng)對文章的整體理解,理解文章主旨,進(jìn)行正確地推理,還要注意細(xì)節(jié)的查找.

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