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1、IfenvironmentaltrendsinWesternnationscontinueonapositivetrack,somedaychildrenmayask,"Mommy,whatwaspollution?"Butbetweenthatdayandoursstandstheultimateenvironmentalproblem:globalwarming.Fightinganartificialgreenhouseeffectisthegreatestofenvironmentalchallenges,becausethecurewillnotbeposs
2、ibleunlessalmosteverynationonEarthparticipates.Inthelastcentury,globaltemperatureshaverisenonedegreeFahrenheit.Somescientistsremainskepticalaboutprojectedfuturewarming,butanoft-heardclaim,thattheideaofglobalwarmingisbeingpromotedonlybyenvironmentalfanatics,isnottrue.Willglobalwarmingcau
3、seharm?Somecomputermodelssuggesttheworldmightwarmbyfivedegreesormoreduringthiscentury,whichmightbedangerous.Meltingpolaricecouldraisesealevels,whileglobalwarmingmightcausemoreintensestormsanddisrupttheweatherpatternsthatbringraintoagriculturalregions.Computermodelsarespeculative(投机的),of
4、course,butwhenthefarmingareasthatwealldependuponforfoodrelyoncurrenttemperatures,rollingthedicewiththeclimatecannotbewise.YettodaytheUnitedStateshasnonationallegislationregulatinggreenhousegases.Whatcanwedorightnow?Therearemethodstoreduceglobalwarming.Forinstance,individualscanmakelifes
5、tylechanges.ReplacetheSUVwitharegularcar;anSUVthatgets14milestothegallonemits100tonsofgreenhousegasesoveritslifetime.Checkoutthenewhybridcars,whichget45mpgorbetter.Moderateyouruseofhomeheatingandairconditioning,mostofwhichispoweredbyfossilfuels,andupgradeappliancestoEnergyStarmodels.1.A
6、ccordingtothepassage,whatisthegreatestenvironmentalchallengetohumanbeings?A.Dealingwiththepollutioncausedbyplasticbags.B.Treatingwiththewastedumpedbyindustrialfactories.C.Fightingagainsttheartificialgreenhouseeffect.D.Disposingthesoundpollution.2.Whatdoestheword"skeptical"(Para2)mean?A.
7、besuspiciousofB.benegativetoC.beopponenttoD.bepositiveto3.WhichofthefollowingisNOTmentionedastheharmoftheglobalwarmingfortheearth?A.Theglobaltemperaturewillincrease.B.Manypreciousspeciesvanishedfromtheearth.C.Thesealeveloftheoceanswillrise.D.Theweatherpatternsmaybedisturbed.4.W