Peoplehavesmokedcigarettesforalongtimenow.ThetobaccowhichisusedtomakecigaretteswasfirstgrowninwhatisnowpartoftheUnitedStates.ChristopherColumbus,whodiscoveredAmerica,sawtheIndianssmoking.SoonthedriedleavesweretransportedtoEurope.Inthelate1800s,theTurksmad

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Peoplehavesmokedcigarettesforalongtimenow.ThetobaccowhichisusedtomakecigaretteswasfirstgrowninwhatisnowpartoftheUnitedStates.ChristopherColumbus,whodiscoveredAmerica,sawtheIndianssmoking.SoonthedriedleavesweretransportedtoEurope.Inthelate1800s,theTurksmadecigarettespopular. Cigarettesmokecontainsatleasttwoharmfulsubstances,tarandnicotine.Tar,whichformsasthetobaccobums,damagesthelungsandthereforeaffectsbreathing.Nicotine,whichisfoundintheleaves,causesthehearttobeatfasterandincreasesthebreathingrate.Nicotineinlargecankillapersonbystoppingaperson′sbreathingmuscles.Smokersusuallytakeinsmallamountsthatthebodycanquicklybreakdown. Nicotinecanmakenewsmokersfeeldizzy(头晕)orsicktotheirstomachs.Theheartrateforyoungsmokersincreases2to3beatsperminute.Nicotinealsolowersskintemperatureandreducesbloodflowinthelegsandfeet.Itplaysanimportantroleinincreasingsmokers′riskofheartdiseaseandstroke. Smokingcigarettesisdangerous.Cigarettesmokingwasthecauseoflungcancerandseveralotherdeadlydiseases. Tobaccofirstappearedin___________.

A.Asia
B.Africa
C.Europe
D.America
正确答案D
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