2019-2020年高考英语二轮复习 阅读理解练习（1）(VI)

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1、2019-2020年高考英语二轮复习阅读理解练习（1）(VI)阅读理解------ARecognizedasthelargestdesertintheworld,theSahararunsacrossNorthAfrica,Coveringover3millionsquaremilesfromtheAtlanticCoasttotheNileRiverValley.Exceptforanoccasionaloasis(绿洲),thisvastlandismainlymadeupofsand,stones,andwornoutmountains.Theburning

2、suncausesdaytimetemperaturestoriseto70degreesintheshade,anddayswithoutrainmonlylastforyears.PaintingsfoundonthewallsofcavesintheSaharaDesertsuggestthatafewthousandyearsago,largequantitiesofplantsgrewthereandcoveredthedesertfloor.Manycuriousandunusualinsects,birdsandanimalsgotenoughfoo

3、dthatallowedthemtogrowandreproduce.Atthattime,hugeriversystemsandmanyoasessupportedgrowingmunities(社团，社区)wherealargenumberofpeoplelived.Researchscientistsbelievethatthelandbecameadesertforseveralreasons.Forcenturiespeopletherehavewanderedfromplacetoplaceinsearchoffood,waterandgrazing(

4、吃草)landfortheiranimals.Thesepeoplehavealwaysconsideredthenumberofanimalstheyhaveasasignofwealth.Itisconsideredmoreimportanttohave100sickandstarvinganimalsthan15healthyones.Thelargeherds(群)havebeenallowedtogofreelyandgrazeondesertplantsandgrass.Overtime,largesectionsoflandhavebeenleftu

5、ncovered.Inadditiontoallowingovergrazing,thesepeoplecutdownwhatevertreestheycouldfindandusedthemforfirewood.Thesandwasunabletoholdontothegreatheatoftheday,sonighttingtemperaturesoftendropbelowfreezingandnothingwaslefttoholdthesoiltogether.Scientistshavebeenstudyingdifferentwaystobring

6、backthegreendesert.Throughresearchandexperiments,theyhopetobeabletoproduceplantsthatwillonceagainsupportthelifethere.Hugeholesfilledwithmuchwaterlieunderthedesertsurface.Scientistsbelievethisrainwatersimplyflewdownthroughthesandoverhundredsofyearsandcollectedinthebig,rockyholdingtanks

7、.Bymakinguseofthesun’spower,scientistsintheSaharahavemadeexperimentsinwhichtheygothugeamountofelectricity.Thiselectricitywasthenusedtooperatedrillingmachinesandpumpstopulltherainwaterfromtheundergroundtanks.Bydrillingtheholeonemiledeepintothefloorofthedesert,onemachinewasabletorecover

8、moret