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课时作业(十七)[必修4Unit2Workingtheland][限时：40分钟]Ⅰ.单项填空1．Firstimpressionsarethemostlasting.Afterall,youneverget________secondchancetomake________firstimpression.A．a;theB．the;theC．a;aD．the;a2．Hetolduswhether________apicnicwasstillunderdiscussion.A．tohaveB．havingC．haveD．had3．Timisingoodshapephysically________hedoesn'tgetmuchexercise.A．ifB．eventhoughC．unlessD．aslongas4．________Saturday,ratherthan________athome,Ipreferred________.A．Itbeing;stay;totravelB．Being;tostay;totravelC．Havingbeen;stay;travelingD．Itwas;tostay;traveling5．—Sorry,Ihaveto________now.It'stimeforclass.—OK,I'llcallbacklater.A．hangupB．breakupC．giveupD．holdup6．Theschoolisgivingmostofthesechildrenhopeforthefuturebyprovidingthemwithachanceto_______knowledge.A．requireB．acquireC．achieveD．discover7．IhavetoseethedoctorbecauseI________alotlately.A．havebeencoughingB．hadcoughedC．coughedD．cough8．Ifthefoodtastesnice,I'llgotobuysomemore;________，Iwon'tgo.A．ifnotB．whennotC．ifanyD．whenever9．Itisrequiredthatthefootballmatch________putoff________thebadweather.A．be;thanktoB．be;duetoC．was;thankstoD．was;owingto10．________oftheirbadhabits,theboys________frombeingdependentontheirparentsto________forothers.A．Havingrid;haveswitched;sacrificingB．Torid;areswitching;sacrificeC．Rid;switched;sacrificingD．Havingbeenrid;areswitched;sacrifice11．Sheprefers________herclothesbyhandsratherthanbymachine.A．havingwashedB．washingC．beingwashedD．towash12．Strangely,thetwomenlook________alikethatnearlyallthepeoplethinktheyaretwinbrothers.A．toomuchB．suchmuchC．muchtooD．somuch13．I'mcertainDavid'stoldyouhisbusinesstroubles.________，it'snosecretthatheowesalotofmoneytothebank.A．HoweverB．AnywayC．OtherwiseD．Though14．Joseph________toeveningclassessincelastmonth,buthestillcan'tsay“What'syourname？”inRussian.A．hasbeengoingB．wentC．goesD．hasgone15．—IsitallrightifIkeepthisphoto?—________.A．No,youdon'tB．No,itshouldn'tC．I'mafraidnotD．Don'tkeepitⅡ.阅读理解AJackieHeinricher'sloveaffairwithbamboostartedinherbackyard.“Asachild,Irememberplayingamongthegoldenbamboomydadhadplanted,andwhentherewasaslightwind,thebamboossoundedreallymusical.”Afisheriesbiologist,Heinricher,47,plannedtoworkinthesalmonindustryinSeattle,whereshelivedwithherhusband,GuyThornburgh,butshefoundittoocompetitive.Thenhergardengavehertheideaforabusiness:She'dplanted20bambooforestsontheirsevenacrefarm.HeinricherstartedBooShootGardensin1998.Sherealizedearlyonwhatisjustnowbeginningtobeknowntotherestoftheworld.Itcanbeusedtomakefishingpoles,skateboards,buildings,furniture,floors,andevenclothing.Anaddedbonus:Bambooabsorbsfourtimesasmuchcarbondioxideasagroupofhardwoodtreesandreleases35percentmoreoxygen.Firstshehadtofindawaytomassproducetheplants—atoughtask,sincebambooflowerscreateseedonlyonceevery50to100years.Anddividingabambooplantfrequentlykillsit.HeinricherappealedtoRandyBurr,atissuecultureexpert,tohelpher.“Peoplekepttellinguswe'dneverfigureitout，”saysHeinricher.“Othershadworkedonitfor27years!Ibelievedinwhatweweredoing,though,soIjustkeptgoing.”Shewasrighttofeelasenseofurgency.Bambooforestsarebeingrapidlyusedup,andaUnitedNationsreportshowedthateventhoughbambooishighlyrenewable,_asmanyashalfoftheworld'sspeciesarethreatenedwithdyingout.Heinricherknewthatbamboocouldmakeasignificantimpactoncarbonemissions(排放)andworldeconomies,butonlyifhugenumberscouldbeproduced.Andthat'sjustwhatsheandBurrfiguredoutafternineyearsofexperiments—awaytogrowmillionsofplants.Byplacingcuttingsintesttubeswithsalts,vitamins,planthormones,andseaweedgel,theygottheplantstogrowandthenraisedtheminsoilingreenhouses.Notlongafterit,Burr'slabhitfinancialdifficulties.Heinricherhadnoexperiencerunningatissuecultureoperation,butshewasn'tpreparedtoquit.Sosheboughtthelab.TodayHeinricherheadsupaprofitablemultimilliondollarcompany,workingonspeciesfromallovertheworldandsellingthemtowholesalers(批发商).“Ifyouwanttofarmbamboo,it'shardtodowithouttheyoungplants,andthat'swhatwehave，”shesaysproudly.16．Whatwasthemainproblemwithplantingbamboowidely?A．Theydidn'thaveenoughyoungbamboo.B．Theywereshortofmoneyandexperience.C．Theydidn'thaveabigenoughfarmtodoit.D．Theywerenotunderstoodbyotherpeople.17．WhatdoesHeinricherthinkofbamboo?A．Fragileandaffordable.B．Productiveandflexible.C．Usefulandearthfriendly.D．Strongandprofitable.18．Theunderlinedword“renewable”inParagraph6probablymeans“________”．A．abletobereplacednaturallyB．abletoberaiseddifficultlyC．abletobeshapedeasilyD．abletoberecycledconvenientlyBAllovermygardenI'veplantednothingbutroses,becauseIespeciallylovetheflower.Aclosefriendcameforavisittheotherday.Itoldherthatsheshouldpickabunchofrosestobeautifyherbedroom.Ipromisedthatthesmelloftheroseswouldbewaftedfar,faraway.Thatgirlfriendofmine,walkingintothegardeninhighspirits,smelthereandthere,butintheendshedidn'tpickasinglerose.Isaidthatshecouldpickmanyflowers;ItoldherthatIwasnotaflowerfarmeranddidn'tmakealivingoutofthem.Sayingso,Iraisedthescissorsforthesacrificeoftheflowers,butshestoppedme,cryingno,no,no!Tocutsuchbeautifulroseswouldhurtone,shesaid.Withherhandsseizingatmysleeves,shetoldmethatbynomeansshouldtheybecut.Rosesarethe