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1、阅读理解。吉林四平市2016高考英语阅读理解（二轮）摸底选练（2）及答案阅读下列短文，从每题所给的叫个选项（A、B、C和D）屮，选出最佳选项。Recognizedasthelargestdesertintheworld,theSahararunsacrossNorthAfrica,Coveringover3millionsquaremilesfromtheAtlanticCoasttotheNileRiverValley.Exceptforanoccasionaloasis（绿洲）,thisvastlandisma
2、inlymadeupofsand,stones,andwornoutmountains.Theburningsuncausesdaytimetemperaturestoriseto70degreesintheshade,anddayswithoutraincommonlylastforyears.PaintingsfoundonthewallsofcavesintheSaharaDesertsuggestthatafewthousandyearsago,largequantitiesofplantsgrewther
3、eandcoveredthedesertfloor.Manycuriousandunusualinsects,birdsandanimalsgotenoughfoodthatallowedthemtogrowandreproduce.Atthattime,hugeriversystemsandmanyoasessupportedgrowingcommunities（社团，社区）wherealargenumberofpeoplelived.Researchscientistsbelievethatthelandbec
4、ameadesertforseveralreasons.Forcenturiespeopletherehavewanderedfromplacetoplaceinsearchoffood,waterandgrazing（吃草）landfortheiranimals.Thesepeoplehavealwaysconsideredthenumberofanimalstheyhaveasasignofwealth.Itisconsideredmoreimportanttohave100sickandstarvingani
5、malsthan15healthyones.Thelargeherds（群）havebeenallowedtogofreelyandgrazeondesertplantsandgrass.Overtime,largesectionsoflandhavebeenleftuncovered.Inadditiontoallowingovergrazing,thesepeoplecutdownwhatevertreestheycouldfindandusedthemforfirewood.Thesandwasunablet
6、oholdontothegreatheatoftheday,sonighttingtemperaturesoftendropbelowfreezingandnothingwaslefttoholdthesoiltogether.Scientistshavebeenstudyingdifferentwaystobringbackthegreendesert.Throughresearchandexperiments,theyhopetobeabletoproduceplantsthatwillonceagainsup
7、portthelifethere.Hugeholesfilledwithmuchwaterlieunderthedesertsurface.Scientistsbelievethisrainwatersimplyflewdownthroughthesandoverhundredsofyearsandcollectedinthebig,rockyholdingtanks.Bymakinguseofthesun'spower,scientistsintheSaharahavemadeexperimentsinwhich
8、theygothugeamountofelectricity.Thiselectricitywasthenusedtooperatedrillingmachinesandpumpstopulltherainwaterfromtheundergroundtanks.Bydrillingtheholeonemiledeepintothefloorofthedes
