阅读理解Cancerisfearedbyeveryone.Andthereismoreandmorefearaboutcancer.Notthediseaseitself-thereisnosuchthingasahighincidencerates(发生率)ofcancer.Exceptforlungcancermostlycausedbycigarettesm

　　阅读理解

　　Cancerisfearedbyeveryone.Andthereismoreandmorefearaboutcancer.Notthedisease

　　itself-thereisnosuchthingasahighincidencerates(发生率)ofcancer.Exceptforlungcancer

　　mostlycausedbycigarettesmokingtheincidenceratesarenotontherise.Howeversomekinds

　　ofcanceraredecreasing. Butthefearofcanceriscatchingandthecountrystandsatriskofan

　　anxiety.Theearthitselfiscomingtoseemlikeahugecarcinogen(致癌物).Theordinarymoreor

　　lessscientificstatementthatsomethingbetween80and90percentofallcancersareduetothings

　　intheenvironmentistakentomeanthatnoneofuswillbesafeuntilthewholeenvironmentis

　　"cleanedup."Thisisnotatallthemeaning.

　　The80-percentcalculationisbasedontheunthinkabledifferencesintheincidenceofcancer

　　invarioussocietiesaroundtheworld-forexamplethehighincidenceoflivercancerinAfricaand

　　theFarEaststomachcancerinJapanbreastcancerinWesternEuropeandNorthAmericaand

　　therelativelylowfiguresforbreastcancerinJapanandpartsofAfricaandforlivercancerinAmerica.

　　Thesedatashowstheremaybespecificenvironmentalinfluencesbutlargelybasedonpersonal

　　life-stylewhichdeterminestheincidenceofvariousformsofcancerindifferentcommunities-thatis

　　allthedatasuggests.Theoverallincidenceofcancercountingupallthecasesisprobableroughly

　　thesameeverywhere.

　　1. Accordingtothepassagetheincidenceofcancerisgenerallybelieved_____.

　　A.tobebasedoninactivelifestyle

　　B.tobeduetoanxiety

　　C.toresultfromenvironmentalinfluences

　　D.tobecausedbyheavysmoking

　　2.Itcanbeinferredfromthepassagethatthewriter'sopinionabouttherelationship between

　　cancerandenvironmentis_____.

　　A.positive

　　B.negative

　　C.neutral

　　D.approving

　　3.Accordingtothepassagethewriterseemstofeelthat_____.

　　A.cancerriskisontherise

　　B.thewholeearthresemblesahugecarcinogen

　　C.theriskofcatchingcancerisnotsogreatasmostpeopleth