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2.B【解析】电离常数只与温度有关,相同温度下,电离常数越大,弱电解质越容易电离,A项错误,B项正确;溶液中的c(H)除与电离程度有关外,还与电解质溶液的浓度有关,C项错误;二元弱酸分步电离,D项错误
W:Tom,whyareyousurfingtheNetagain?It’sarealwasteoftime,I’vetoldyou.M:Imdoingmyhomework,Mom.Ineedtowriteapaper,andImlookingfortheinformationontheNet.W:Really?M:Yes.Youseeyoucanfindalotofinformationbyenteringthekeywordsandsearchingforthem.W:That’sfantastic!M:AndtheNetcanalsohelpyoudoshopping.It’scalledE-shopping.W:HowcanIdoshoppingwithoutgoingtotheshops?M:It’seasy.Firstyoulogontoanonlineshoppingdeliveryservice,whichwillgiveyouthepicturesofdifferentgoods.Thenyousimplypointandclickaroundthescreenforthegoodsyouwant.Thegoodswillbesenttoyou.W:Ican’tbelieveit.Letmehaveatry.M:Itcansaveyoualotoftime.听下面一段对话,回答第13至第16四个小题。现在,你有20秒钟的时间阅读这四个小题。(Text9)M:Jean,Imready.W:That’sgreat!Whatareyoureadyfor?M:ImreadyformytriptoHawaii.See?Iboughtnewsunglasses.W:Verynice!SowhenareyougoingtoHawaii?M:Um,Idon’tknow.Ihaven’tbookedthetripyet.Canyouhelpme?W:Ofcourse.That’smyjob.M:I’msoexcited.WhenIaminHawaii,Imgoingtowalkonthebeach.MaybeIwilllieonthesand.Imalsogoingtoswimintheocean.AndI’mgoingtosurf,too!W:Thatsoundsgreat.Butdoyouknowhowtosurf?M:No.ButIwanttolearn.W:Icanbooksomelessonsforyou.M:Thatwouldbegreat.W:WhenwouldyouliketogotoHawaii?M:Idon’tknow.Whenisthebesttime?W:IcanusuallyfindgooddealsonflightsandhotelsinMay.TheweatherisveryniceinMay.Also,fewertour-istsgotoHawaiiinMay,soit’snotcrowded.M:Great!BookmytripforMay!听下面一段独白,回答第17至第20四个小题。现在,你有20秒钟的时间阅读这四个小题。(Text10)W:Scientistsaretryingtomakethedesertintogoodlandagain.Theywanttobringwatertothedesert,sopeoplecanliveandgrowcrops.Theyarelearningalotaboutthedesert.Butmoreandmoreoftheearthisbe-comingdesertallthetime.Scientistsmaynotbeabletochangethedesertintime.Whyismoreandmorelandbecomingdesert?Scientiststhinkpeoplearedoingbadthingstotheearth.Someplacesontheearthdon’tgetmuchrain.Buttheystilldon’tbecomedesert.Thisisbecausesomegreenplantsaregrowingthere.Smallgreenplantsandgrassareveryimportanttodryplaces.Plantsdon’tletthesunmaketheearthevendrier.Plantsdon’tletthewindblowthedirtaway.Whenabitofrainfalls,theplantsholdthewater.Withoutplants,thelandcanbecomedeserteasily.
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