()4.Howmuchsleepshouldboysandgirlsofnineyearshaveeverynight?A.EighthoursB.Ninewearereadytoworkandplayagain.Whileweareasleepourbodiesgrowmost.Childrenusuallyneedmoresleep.Wecangetourlessonsbetterandwefeelbette
()4.Howmuchsleepshouldboysandgirlsofnineyearshaveeverynight?A.EighthoursB.Nine
wearereadytoworkandplayagain.Whileweareasleepourbodiesgrowmost.Childrenusuallyneedmoresleep.Wecangetourlessonsbetterandwefeelbettertoo,whenwehaveplentyofrest.Boysandgirlsneedtenhoursofsleepeverynightwhentheyareeightornineyearsold.Ourbodiesneedlotsofairwhenwesleep.Ifwedonotgetenoughfresh(新鲜的)airwe’llfeeltiredwhenwewap.Whileinbedwemustnotcoverourheads.Ifwedo,ourlungs(肺)willnotgetenoughfreshair.Ifweopenourwindowsatnightwecanhaveplentyoffreshair.Coolairisbetterthenwarmair.Boysandgirlsmustgetenoughsleepiftheywanttogrowandbestrong.