PassageTwoQuestions7to11arebasedonthefollowingpassage.Thewaterlevelofoceansrisesandfallsalternately(交替地)twiceaday.Thismovementofwateriscalledthetide(潮汐).Tidesarecausedbythepullofthesunandthemoonontheearth’ssurface;sincethemooniscloser,itaffectsthetidesmorethanthesun.Whenthemoonisdirectlyoverhead,itactuallypullsonthewaterthatisbelowit.Thiscausesthewaterleveltorisebecausethewaterispulledawayfromtheearth.Asthemoondisappearsoverthehorizon(地平线),thepulllessensandthewaterlevelsettlesbacktowardstheoceanbottom.Whenthewaterreachesitshighestlevel,wehavehightide.Andwhenthewatercomestoitslowestlevel,wehavelowtide.Fromitslowestpoint,thewaterrisesgraduallyforaboutsixhoursuntilitreacheshightide.Thenitbeginstofallcontinuouslyforaboutsixhoursuntilitreacheslowtide.Thenthecyclebeginsagain.7.Whichofthefollowingmightbethebesttitleforthepassage?

PassageTwoQuestions7to11arebasedonthefollowingpassage.Thewaterlevelofoceansrisesandfallsalternately(交替地)twiceaday.Thismovementofwateriscalledthetide(潮汐).Tidesarecausedbythepullofthesunandthemoonontheearth’ssurface;sincethemooniscloser,itaffectsthetidesmorethanthesun.Whenthemoonisdirectlyoverhead,itactuallypullsonthewaterthatisbelowit.Thiscausesthewaterleveltorisebecausethewaterispulledawayfromtheearth.Asthemoondisappearsoverthehorizon(地平线),thepulllessensandthewaterlevelsettlesbacktowardstheoceanbottom.Whenthewaterreachesitshighestlevel,wehavehightide.Andwhenthewatercomestoitslowestlevel,wehavelowtide.Fromitslowestpoint,thewaterrisesgraduallyforaboutsixhoursuntilitreacheshightide.Thenitbeginstofallcontinuouslyforaboutsixhoursuntilitreacheslowtide.Thenthecyclebeginsagain.7.Whichofthefollowingmightbethebesttitleforthepassage?

已知消费者的收入为100元，商品X的价格为5元，商品Y的价格为3元。消费者消费了7个X和10个Y，此时，X和Y的边际效用分别为50和18，消费者要增加满足感应该（）

7.WhichTVprogrammedoyoulike,talentshowortalkshow?

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