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3.D此题考查物质跨膜运输方式的类型及特点,侧重考查理解能力和获取信息能力。【解析】图中的葡萄糖是由钠驱动的葡萄糖载体蛋白运输的,这种协同运输方式利用钠钾泵所产生的Na浓度梯度来推动,虽然属于消耗能量的主动运输,但不需要ATP直接供能,A错误。葡萄糖进入小肠上皮细胞属于主动运输,Na进入小肠上皮细胞是协助扩散,B错误。钠钾泵从膜外吸收K的方式是消耗ATP的主动运输,C错误。钠钾泵的功能会直接影响膜内外Na的浓度差,这样就会间接影响小肠上皮细胞吸收葡萄糖,D正确。
M:Ithinkit’sprobablybrokenandI’dliketohaveanX-raytakenifyouthinkit’snecessary.W:Yes.LetmetaketheX-rayforyou.M:Isitserious?W:Oh…I’mhappytotellyouthatyoudidn’tbreakyourarmatall.AccordingtotheX-ray,it’snotserious.M:Whatapity!IfIhadbrokenmyarm,Ineedn’tgotoschool.Text8M:Didyouwatchtelevisionlastnight?AviolentstormhitSouthFlorida.It’sterrible.W:No,Ididn’t.Totellyouthetruth,IseldomwatchTVM:Why?W:TherearefewprogramsthatIfindinterestingenoughtowatch.M:Well,therearesomeshowsthatIwillnevermiss.Don’tyoueverwatchSiarTrek?W:Yes,Iwatchitnowandthenbutitisn’tsomethingIcan’tlivewithout.M:Iamabigfanofit.AndeveryweekIexpectthecomingofFridaynight.Ilovethehostandthecharactersinthatprogram.W:IknowtherearesomegoodprogramsonTV,buttherearealsomanyprogramswhichincludetoomuchviolenceinthem.M:Iagreewithyouthere.Text9W:SoPeter,whatkindofapartmentshouldweget?I’mreallylookingforwardtogettingaplaceofourown.M:Yeah,itwillbeagreatthing.Well,Iwanttofindusaniceplace,butoursalaryisn’tveryhighsowemightneedtofindsomeplaceabitlessexpensive.W:ThewayIfigureit,wecanbothputbetween200and250dollarsamonthintorent.Thatleavesenoughforfoodandotherexpenses,right?M:Thatsoundsgood.I’mafraidifwespendanythingelseonhousing,we’llbelikelivinginarattrap.W:Sowemusthaveahouseofonebedroom,alivingroomfortheTV,abathroomandalittlekitchen.Anythingelse?M:Also,Idon’twanttobetoofarawayfromdowntown.Thetrafficisjusttooheavytogettowork.Wouldn’titbegreatifwecouldwalktoworkeveryday?W:We’llseewhatwecanfind.Apartmentsclosertodowntownaremoreexpensive.M:Don’tworry.Wecertainlycanfindagoodone.Text10Almostfifty-millionAmericanshavehighbloodpressure.It’sakindofdangerousillnesswhichcancauseheartdisease.Mostdoctorshavelongbelievedthatreducingsaltcandecreasebloodpressure.AnewAmericanstudysuggeststhisistrueevenwhenpeopledonoteatthehealthiestfood.AteaminBostondidthisstudy.Morethanfourhundredpeopletookpartintheresearch.Almosthalfofthemhadhighbloodpressure.Theyallatefoodwithdifferentamountsofsalt.Saltcontainssodium.Thereisstrongevidencethatsodiumaffectsbloodpressure.HalfofthepeopleateanaverageAmericandiet.Thestudyshowedthatthepeoplewhoatehealthfulfoodwhileeatinglesssalt
