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1、中考复习科普环保类专项练习一、阅读理解WhenyouwatchTVprogramsaboutwildanimals,itissurprisingtoseehowanantelope(羚羊)canrunawayfromastronglion.Inthewilderness,everyonehashisownwaytoprotecthimself.Evenplantshavetheirownwaystofightoffenemies.Overmillionsofyears,plantshavedevelopedtheirowndefensesystem(防卫系统).Chemicals
2、arefantasticallyusedbyplantstosurvive(幸存).Bymakingtheirleaves,flowers,rootsandfruitspoisonous(有毒的)toenemies,plantscanfightback.OnesuchplantistheGoldenWattletree.TheBritishscientistDavidCameronhasfoundwhenananimaleatsthetree’sleaves,theamount(数量)ofpoisonincreasesintheotherleaves.“It’slikethein
3、juredleavestelephoningtheotherstofighttogetheragainsttheenemy,”hesaid.Thetreealsosendsdefensemessagestoneighboringplantsbygivingoutaspecialsmell.GoldenWattletreesinthenearby45meterswillgetthemessageandproducemorepoisonwithin10minutes.Now,ifanenemyeatstoomanyofthetrees’leaves,hewilldie.Everyki
4、ndofplantortreeisgoodatproducingaspecialsetofchemicals.Herbivores,likerabbits,cansafelyeattheleavesofonetree,buttheymaybepoisonedbyitsneighbor.Inthisway,plantshavenotonlydevelopedtheirowndefensesystem,butalsoshareditwithothers.Thismakesitimpossibleforasingleanimaltodestroyevenasmallareaoffore
5、st.1．Fromthefirst2paragraphs,wecanlearnthat_________.A.plantscandonothingagainsttheirenemiesB.chemicalsarequiteusefulforplantstosurviveC.anantelopecanalwaysrunawayfromastronglionD.leaves,roots,flowersandfruitsofplantsarepoisonous2．IfanimalseatoneGoldenWattletree’sleaves,thetreecan________.A.k
6、illtheanimalswithaspecialsmellB.tellothertreestocometoprotectitC.warnothertreesagainsttheanimalsonthephoneD.senddefensemessagestotheneighboringplants3．Theunderlinedword“herbivores”inthe5thparagraphprobablymeansanimalswhich_____.A．producepoison B．liveonsmallan
7、imalsC．liketoeatrabbits D．feedonplantsorgrass4．Thelastparagraphofthepassagesuggeststhatthiskindofdefensesystemis18________.A．badforanimals B．goodforforestsC．helpfultosomea
