7、on6thatifapersonspendstoolongatimeinbed,thenthey’llspendahigherpercentageoftimeawake,”hesaid. 练习: 1.Paragraph2________ 2.Paragraph4________ 3.Paragraph5________ 4.Paragraph6________ A Kripke’sResearchTool B DangersofHabitualShortagesofSleep C CriticismonKr