According to the study the daily healthy sleep time for the 3rd to 6th graders should be

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According to the study, the daily healthy sleep time for the 3rd to 6th graders should be around______hours.

A.8

B.9

C.10

D.11

请帮忙给出正确答案和分析,谢谢!

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答案解析

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  • 正确答案:B
    推断题。根据“Overthe3yearsofthestudy,thechildrenaveragedahealthy9hoursofsleepanight.”可知,对于孩子来说,平均9个小时是健康的睡眠时间,上文中提到了“threeyearslater”和“bythesixthgrade”,由此可知[B]为答案。