一道英语的阅读理解Howcouldwetelltimeiftherewerenowatchesorclocksanywhereintheworld?Thesunwasprobablytheworld’sfirst“clock”,exceptinthefarnorth,wheretheEskimos(爱斯基摩人)live.There,it’sdarkmostof

　　一道英语的阅读理解

　　Howcouldwetelltimeiftherewerenowatchesorclocksanywhereintheworld?

　　Thesunwasprobablytheworld’sfirst“clock”,exceptinthefarnorth,wheretheEskimos(爱斯基摩人)live.There,it’sdarkmostofthewinter,andlightmostofthesummer.Butinmostoftheworld,peoplehaveusedthesunfooday,ifyoudon’thaveaclockthatshowstime,youstillknowthatwhenthesunshines,it’sday,andwhenit’sdark,it’snight.Thesuncannotonlytellyouwhetherit’sdayornightbutalsoit’smorning,noon,orafternoon.Whenthesunisalmostdirectlyoverhead,it’snoon.

　　Peoplewholiveneartheseafromthetides.Inthedaytime,foraboutsixhours,thewaterriseshigherandhigheronthebeach.Andthenitaboutsixhours.Thesamethinghappensagainatnight.Therearetwohightides

　　andtwolowtidesevery24hours.

　　Seamenonashiplealltimebylookingatthemoon

　　andthestars.Thewholeskyistheirclock.

　　Insomeplacesintheworldthewindcomesupataboutthesame

　　timeeverydayorchangesdirectionorstopsblowing.Intheseplaces

　　thewindcanbetheclock.

　　Asandclockisanevenbetterclock.Ifyouhadfinedrysandina

　　glassshapedliketheoneinthethesandwilltakeanotherhourtogobackagain.

　　51.Fromthepassagewecanknowthereare_____waystotelltimebesidestheclockandwatch.

　　A.3B.4C.5D.7

　　52.TheEskimosinthefarnorthcan’tusethesunforaclockbecause______.

　　A.theyknowverylittleaboutthesun

　　B.thesuntherenevergoesdowninwinter

　　C.it’stoocoldforthemtogoouttowatchthesun

　　D.ithaslongdaandlonglightsummers

　　53.Theunderlinedword“tide”inthepassagemeans_______.

　　A.洋流B.潮汐C.海啸D.波浪

　　54.Inwhichpageofthenewspapostprobablyreadthispassage?

　　A.News.B.Science.C.AdvertisementD.Sports.

　　55.What’sthebesttitleforthepassage?

　　A.DifferentWaystoTellTimeB.HowtheClockWasInvented

　　C.TheDevelopmentoftheClockD.AUsefulMachinetoTellTime

　　看第51题为什么答案是5种?我觉得是7种啊.因为他的意思不是包括表和钟有几种吗?

　　1搂在说什么？