高三限时训练题VIP免费

2015年1月高三英语限时训练NewgeneticanalysishasrevealedthatmanyAmazontreespeciesarelikelytosurvivehuman-madeclimatewarminginthecomingcentury,contrarytopreviousfindingsthattemperatureincreaseswouldcausethemtodieout.Astudy,36inthelatesteditionofEcologyandEvolution,revealsthe37ageofsomeAmazoniantreespecies--morethan8millionyears--and38showsthattheyhavesurvivedpreviousperiodsaswarmasmanyoftheglobalwarmingimaginedperiods39fortheyear2100.Theauthorswritethat,havingsurvivedwarmperiodsinthepast,thetreeswill40survivefuturewarming,providedtherearenoothermajorenvironmentalchanges.41extremedroughtsandforestfireswillimpactAmazoniaastemperatures42,thetreeswillstandthedirectimpactofhighertemperatures.Theauthors43thataswellasreducinggreenhousegasemissionstominimizetheriskofdroughtandfire,conservationpolicyshouldremain44onpreventingdeforestationforagricultureandmining.Thestudydisagreeswithotherrecentresearcheswhichpredictedtreespecies’extinctions45relativelysmallincreasesinglobalaverageairtemperatures.Studyco-authorDrSimonLewis(UCLGeography)saidthe46weregoodnewsforAmazontreespecies,butwarnedthatdroughtandover-exploitationoftheforestremainedmajor47totheAmazon’sfuture.DrLewissaid:“Thepastcannotbecompareddirectlywiththefuture.whiletreespeciesseemlikelyto48higherairtemperaturesthantoday,theAmazonforestisbeingtransformedforagricultureand49,andwhatremainsisbeingdegradedbylogging,andincreasinglysplitupbyfieldsandroads.“Specieswillnotmoveasfreelyintoday’sAmazonastheydidinpreviouswarmperiods,whentherewasnohuman50.Similarly,today’sclimatechangeisextremelyfast,makingcomparisonswithslowerchangesinthepast51.”“Withaclearer52oftherelativeriskstotheAmazonforest,we53thatdirecthumanimpacts--suchasforestclearancesforagricultureormining--shouldremainakeypointofconservationpolicy.Wealsoneedmoreaggressive54toreducegreenhousegasemissionsinordertomakeminimumtheriskofdroughtandfireimpactsand55thefutureofmostAmazontreespecies.”36.A.advertisedB.describedC.publishedD.presented37.A.frighteningB.surprisingC.excitingD.interesting38.A.stillB.neverthelessC.howeverD.therefore39.A.assessB.confirmC.forecastD.promise40.A.particularlyB.probablyC.merelyD.possibly41.A.SinceB.AlthoughC.WhenD.If42.A.riseB.changeC.dropD.end43.A.considerB.decideC.guaranteeD.recommend44.A.basedB.builtC.focusedD.made45.A.inrelationtoB.inresponsetoC.inreplytoD.inreferenceto46.A.findingsB.thoughtsC.inventionsD.writings47.A.threatsB.disadvantagesC.embarrassmentsD.instructions48.A.acceptB.tolerateC.permitD.Require49.A.farmingB.plantingC.cateringD.mining150.A.powerB.influenceC.desireD.violence51.A.difficultB.clearC.easyD.important52.A.beliefB.directionC.understandingD.suggestion53.A.doubtB.concludeC.calculateD.prefer54.A.thoughtB.guidanceC.protectionD.action55.A.secureB.advanceC.sacrificeD.evaluate阅读理解:Wecanbeginourdiscussionof“populationasglobalissue”withwhatmostpersonsmeanwhentheydiscuss“thepopulationproblem”:toomanypeopleonearthandatoorapidincreaseinthenumberaddedeachyear.Thefactsarenotindispute,Itwasquiterighttoemploytheanalogythatlikeneddemographicgrowthto“along,thinpowderfusethatburnssteadilyandhaltinglyuntilitfinallyreachesthechargeandexplodes.”Tounderstandthecurrentsituation,whichischaracterizedbyrapidincreasesinpopulation,itisnecessarytounderstandthehistoryofpopulationtrends.Rapidgrowthisacomparativelyrecentphenomenon.Lookingba...