- 问题详情:Howmuchsleepdoweneed?Wearealldifferent.Somepeopleneedonlythreehoursofsleepanight.Othersneedtenhoursofsleepanight.MostAmericanssleepanaverage(平均)ofseventoeighthoursanight.Aftertheageoffifty,theaveragesleeptimegoesdownto6.5hoursaday.Mostpeopl...
- 30725
- 问题详情: Howmuchsleepdoweneed?Wearealldifferent.Somepeopleneedonlythreehoursofsleepanight.Othersneedtenhoursofsleepanight.MostAmericanssleepanaverage(平均)ofseventoeighthoursanight.Aftertheageoffifty,theaveragesleeptimegoesdownto6.5hoursaday.Mos...
- 10873