B.An increase in weight and height.
C.More concerned with their diet.
D.A decrease in bone and muscle.
答案 A
解析 细节理解题。根据第三段中的“...who slept for eight hours a day,had a waist size 1.8 cm bigger and 1.6 kg,or 9 percent,more body fat than ...who slept 10 hours a day.”可知,一天睡八个小时的男孩和一天睡十个小时的男孩相比,腰围更宽,体内脂肪更多。故选A。
3.From the sixth paragraph we can infer that
.
A.girls usually sleep less and have healthier lifestyles than boys
B.the researchers expected to see the same result in girls
C.people’s diet has a great effect on their health
D.boys are usually lazier than girls
答案 B
解析 推理判断题。根据第六段中的“It was unexpected that we did not find the same result in girls...”可知,在女孩身上并没有发现同样的结果,这是没有预料到的,由此可推断B项符合题意。
4.Who would be the most pleased to hear the news?
A.Teachers.
B.Girls.
C.Parents.
D.Boys.
答案 D
解析 推理判断题。通读全文可知,调查研究的结果是:十几岁的男孩睡得越多反而更健康,由此可推断D项符合题意。
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