防治癌症(Controlling Cancer)

详细内容

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therearetwomaincausesofcancer:heredityandenvironment.wecandonothingtochangeourheredity,thatis,thebasicphysicalcharacteristicsthatwerepassedontousbyourparents.however,wecandoagreatdealtocontrolourenvironment,whichmayaountfor80-90%ofallcancers.environmentalpollutioncanbedividedintotwokinds:personalandimpersonal.personalpollutionmaybedefinedroughlyasunhealthyhabitssuchassmoking,drinking,andeatingthewrongfoods.clearly,withenoughwillpowerwecancontrolthispersonalenvironment.

impersonalpollution,ontheotherhand,referstothosethingswhicharebeyondourindividualcontrol.oneexamplewouldbeindustrialpollution,whichisveryhardtocontrolbecauseoftheexpenseinvolved.itwouldbeexpensiveintermsofprofitsandperhapsjobs.theamericanautomobileindustry,forexample,resistedthelawrequiringsmog-controldevicesbecauseitfearedtheaddedexpensewouldreduceprofits.nevertheless,somelawsprotectingtheenvironmenthavebeenquitesuessfulinreducingpollution.