Two groups of people are compared in the third study. They are people

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问题 Two groups of people are compared in the third study. They are people

选项 A、with less than 5 hours of sleep a night and with 7 to 9 hours of sleep
B、who slept 4 hours a night and who slept 4 hours for 2 nights
C、with less than 4 hours of sleep a night and with 7 to 9 hours of sleep
D、with less than 5 hours of sleep a night and with 8 hours of sleep

答案C

解析
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