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1、--必修三第五单元单元测试卷一、阅读理解AInthe1950s,afamilywhoownedafarmnearBeulah,Michigankeptabullchainedtoanelm(榆树).Thebullpacedaroundthetree,draggingtheheavyironchain,whichledtoagroove(槽)inthebark.Thegroovedeepenedovertheyears,thoughforwhateverreason,itdidnotkillthetree.Aft
2、ersomeyears,thefamilytooktheirbullaway.Theycutthechain,leavingtheloop(圈)aroundthetreeandonelinkhangingdown.Thenoneyear,agriculturaldisasterstruckMichiganintheformofDutchElmDisease.Alloftheelmsliningtheroadleadingtothefarmbecameinfectedanddied.Everyonethought
3、thattheoldelmwouldbenext.Thefarm’ownersconsidereddoingthesafething：pullingitoutandcuttingitupintofirewoodbeforeitdied.Buttheysimplycouldnotbringthemselvestodoit.Itwasasiftheoldtreehadbecomeafamilyfriend.So,theydecidedtoletnaturetakeitscourse.Amazingly,thetre
4、edidnotdie.Nobodycouldunderstandwhyitwastheonlyelmthatwasstillstandinginthecountry!Plantpathologists(病理学家)fromMichiganStateUniversitycameouttoobservethetree.Theyobservedthescarleftbytheironchain,nowalmostcompletelycoveredbybark.Theplantexpertsdecidedthatitwa
5、sthechainthatsavedtheelmheyreasoned’lifethat.Tthetreemusthaveabsorbedsomuchironfromthechainthatitbecameimmune(免疫)tothefungus(真菌).It’ssaidthatwhatdoesn’tkillyouwillmakeyoustronger.Or,asErnestHemingwayputit,“Lifebreaksusall,butafterwards,manyofusarestrongestat
6、thebrokenplaces.”1.WhathappenedtotheelmsinMichiganduringtheagriculturaldisaster?A.Theelmsweretiedbyironchains.B.Someoftheelmswerecutupintofirewood.C.Alltheelmswereinfectedbyadiseaseanddied.D.Nearlyalloftheelmsdiedofadisease.2.Fromthepassagewecanlearnthattheo
7、ldelmwassavedby________.A.thegrooveinthebarkB.thefungusinthetreeC.theironremaininginitD.itsownimmunesystem3.Theunderlinedsentence“letnaturetakeitscourse”means______.A.leavetheelmatthemercyofnatureB.helptheelmgrownormallyC.letnaturetaketheelmawayD.havenatureg
8、ivealessontotheelm----4.Whatisthebesttitleforthetext?A.NeverLoseHeartinTroubleB.StrikeWhiletheIronisHotC.BravetoFaceFailureD.StrongerafterSufferingBSomefuturologistshaveassumedthatthevastupsurge
