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23． How many hours of sleep is good for studen

2022-08-06 08:18:11 问答库阅读 177 次

问题详情

23． How many hours of sleep is good for students" health？
A． Less than 9 hours．
B． Over 9 hours．
C． Only 9 hours．
D． 7 hours．

正确答案：B
23.B【解析】从原文可知，应多于9个小时。