答案 C
解析 主旨大意题。通读全文可知,本文是一项关于青少年睡眠时间的长短与身体健康关系的调查。故选C。
2.What’s the result of less sleep for teenage boys?
A.A bigger waist and more fat in the body.
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。
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