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[单选题]Lack of sleep causes poor academic performance and health issues. ______ show that starting no earlier than 8:30 is recommended, yet only 14 percent of public high schools actually follow that guideline.dkk答案窝(daanwo.com)-大学生作业答案及考资分享平台
ANumbersdkk答案窝(daanwo.com)-大学生作业答案及考资分享平台
BResultsdkk答案窝(daanwo.com)-大学生作业答案及考资分享平台
CStatistics
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