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第二部分阅读理解（共两节，满分40分）第一节（共15小题;每小题2分，满分30分）AJustbecauseyouseethematthezooitdoesn’tmeanthey’redoingallrightinthewild.GiraffesIUCN(世界自然保护联盟）hasputsomegiraffesatacriticallyendangered(淑危的）status.Thereareonly4,000KordofanandNubiangiraffesleft.Thegiraffepopulationhasdeclinedprimarilyduetolossofhabitat，socialdisorder,andpoaching(偷猎）accordingtopriority(优先考虑的事）.Somegiraffesarekilledjustfortheirtails，whichareconsideredstatussymbolsinpartsofAfrica.WhalesAsfewas300NorthAtlanticrightwhalesremaininthewild.Infact,sixoutofthe13greatwhalespeciesareendangered.Pollutionisamajorthreatforthesegiants，plus，morethan1T000whalesarekilledeveryyearforcommercialpurposes.TigersAllsixtigerspeciesareendangered,withSumatranandSouthChinatigersatacriticallyendangeredstatus.SomescientistsevenconsidertheSouthChinatigertobe“functionallyextinct”sinceithasn'tbeenseeninthewildinmorethan25years.Themainreasonsfortheirpopulationdeclinearepoachinganddestroyedhabitats,ashumansclearforeststogatherwoodandbuildroadways.Onlyabout3,890tigerscurrentlyliveinthewild.AsianelephantsThemainthreattoAsianelephantsistheirshrinkinghabitat.Asthehumanpopulationgrows,peopletaketheirlandtobuildroadsandrailwaytracks.ElephantsinMyanmararealanespeciallyhighriskforbeingcaughtandtradedorusedillegallyinthetouristindustry.Itisunknownjusthowmanyelephantsareleftontheentirecontinent,butexpertsestimatenumberscouldbefewerthan50,000.It’salarmingbutimportanttolearnabouttheseanimalsthatcouldgoextinctwithinyourlifetime.21.Whatmostlycausesthegiraffepopulationdecline?A.Lossofhabitat.B.Socialdisorder.C.Illegalhunting.D.Giraffe-tailtrading.22.WhyareSouthChinatigersconsidered“functionallyextinct”?A.BecauseChinahasthefewesttigersintheworld.B.Becauseallsixtigerspeciesaredecreasingrapidly.C.Becausepeoplehaven'tseentheminthewildfordecades.D.Becausetheirconditionshaven51improvedformanyyears.23.WhatcanweknowaboutAsianelephants?A.Theyareprivatelytakenbymanyasastatussymbol.B.Thetouristindustryhaslaidtoomuchemphasisonthem.C.Roadsandrailwaytrackshaveforcedthemtomoveaway.D.Humanactivitiesaretoblamefortheirshrinkingpopulation.BMemes(表情包）havetakentheInternetbystormasanewformofcomedy,orevenanewartform.Sowhatexactlyarememes?AccordingtoWikipedia,amemeisanidea,behavior,orstylethatspreadsfrompersontopersonwithinacultureoftenwiththeaimofconveyingaparticularphenomenon，themeormeaning.ThewordmemewascreatedbyBritishbiologistRichardDawkinsinhis1976bookTheSelfishdenewhereheputforththetheory.AccordingtoDawkins,memesareverylikelytospreadingandcopying,butonlythequalityonesbecomesuccessfulandkeepspreadingtoeventuallyreachawell-receivedstatuswherethelesseionesdieout.Youcanmakeachoicetousethempurelyforlaughsortomakeapoliticalmessageandevenbothatthesametime.IntheearlyInternetdays,thememeswerespreadonpersontopersonbasis.AstheInternetdeveloped,itsinteractivenatureallowedpeopleworldwidetoparticipateinthecraze.ThisgaverisetoearlyInternetmemeslikeTheHumpsterdanceSong,andsomemesbeganspreadingthroughInternetforums,meme-special-izedwebsitesandsocialmedialikeFacebook,Myspace,etc.Soontheybeganbeingusedasacommercialformofmassmarketingandpublicity(宣传）spreading.Thenprogrammersstartedmakingmemegenerators.Bycomoaringmanyonlinememegenerators,wefoundoutFilmoratobethebestone.Thishassomanycoolfeatures.Andthebestthing,youcaneasilygen-eratememewithoutanykindofloginprocess.JustcometoFilmorawebsite,selecttheimage,giforvideofromwhichyouwanttocreateameme,andadddtheeffectsandtexteasyaseatingicecream,Sohappybeing!24.AccordingtoDawkins,whatmoniescanpetpopular?A.Memesoffinequality.B.MemeswithC.Memescontainingplainfun.D.Memeswith25.Whatcanheinferredfromthethirdparagraph?A.MemesarecloselylinkedtotheInternet.B.Memeswerespreadonpersontopersonbasin.C.Peoplearoundtheworldwerefondofthetrend.D.Memesarebasicallyusedforcommercialpurposes,26.WhatmakesFilmorastandoutfromtherest?A.Ithasawiderangeofcoolestfealures.B.Ithaseasieraccesstueatingicecream.C.Itallowstheusertoaddpersonaleffects.D.Itneedsnorequirenientstosignupatall.27.Forwhatpurposeisthetextwritten?A.Toexchangeideaswithmemelovers.B.B.Tointroducethetechniquesofmemes.C.Toinformreadersofsomefactsofmemes.D.Tooffertipsoncreatingone'sownmemes.CTheworldisagreenerplacethanitwas20yearsago.RecentINASAsatellitedata(2000〜2017)haveshownthathumanactivitiesinChinaandIndiadominatethisgreeningoftheplanet,thankstoambitioustree-plantingprogramsinChinaandintensiveagriculture(集约农业）inbothcountries.TheresearchersfromBostonUniversityfoundthatglobalgreenleafareahasincreasedby5percentinthenewcentury,anareaequaltoalloftheAmazonrainforest.Chinaaloneaccountsfor25%oftheglobalnetincreaseinleafareawithonly6.6%ofglobalvegetatedarea.China’scontributioncomesinlargepartfromitsprogramstoconserveandexpandforests,takingupabout42percentofthegreening.ThegreeningfromcroplandsinChinaisabout32%，butthatinIndiaisabout82%.RamaNemani,aresearchscientistatNASA'sAmesResearchCenterandaco-authorofthestudysaid,“WhenthegreeningoftheEarthwasfirstobserved，wethoughtitwasduetoawarmer，wetterclimateandfer-lilization(施肥）fromtheaddedcarbondioxideintheatmosphere.Butwithd