Wheredopesticidesfitintothepictureofenvironmentaldisease?Wehaveseenthattheynowpollutesoil,waterandfood,thattheyhavethepowertomakeourstreamsfishlessandourgardensandwoodlandssilentandbirdless.Man,howevermuchhemayliketopretendthecontrary,ispartofnature.Canheescapeapollutionthatisnowsothoroughlydistributedthroughoutourworld:
Weknowthatevensingleexposurestothesechemicals,iftheamountislargeenough,cancauseextremelyseverepoisoning.Butthisisnotthemajorproblem.Thesuddenillnessordeathoffarmers,farmworkers,andothersexposedtosufficientquantitiesofpesticidesisverysadandshouldnotoccur.Forthepopulationasawhole,wemustbemoreconcernedwiththedelayedeffectsofabsorbingsmallamountsofthepesticidesthatinvisiblypolluteourworld.
Responsiblepublichealthofficialshavepointedoutthatthebiologicaleffectsofchemicalsarecumulativeoverlongperiodsoftime,andthatthedangertoindividualmaydependonthesumoftheexposuresreceivedthroughouthislifetime.Fortheseveryreasonsthedangeriseasilyignored.Itishumannaturetoshakeoffwhatmayseemtousathreatoffuturedisaster."Menarenaturallymostimpressedbydiseaseswhichhaveobvioussigns,"saysawisephysician,DrReneDubos,"yetsomeoftheirworstenemiesslowlyapproachthemunnoticed."
练习题：
Choosecorrectanswerstothequestion:
1.Whichofthefollowingisclosestinmeaningtothesentence"Man…ispartofnature"(Para.1,Lines3-4)?
A.Manappearsindifferenttowhathappensinnature.
B.Manactsasifhedoesnotbelongtonature.
C.Mancanavoidtheeffectsofenvironmentalpollution.
D.Mancanescapehisresponsibilitiesforenvironmentaleffectsofpesticides?
2.Whatistheauthor"sattitudetowardtheenvironmentaleffectsofpesticides?
3.Intheauthor"sview,thesuddendeathcausedbyexposuretolargeamountsofpesticides_____.
A.isnottheworstofthenegativeconsequencesresultingfromtheuseofpesticides
B.nowoccursmostfrequentlyamongallaccidentaldeaths
C.hassharplyincreasedsoastobecomethecenterofpublicattention
D.isunavoidablebecausepeoplecan"tdowithoutpesticidesinfarming
4.Peopletendtoignorethedelayedeffectsofexposuretochemicalbecause_____.
A.limitedexposuretothemdoeslittleharmtopeople"shealth
B.thepresentismoreimportantforthemthanthefuture
C.thedangerdoesnotbecomeapparentimmediately
D.humansarecapableofwithstandingsmallamountsofpoisoning
5.ItcanbeconcludedfromDr.Dubosremarksthat_____.
A.peoplefindinvisiblediseasesdifficulttodealwith
B.attacksbyhiddenenemiestendtobefatal
C.diseaseswithobvioussignsareeasytocure
D.peopletendtooverlookhiddendangerscausedbypesticides
