距离2017年6月大学英语四级考试还有不到一个半月的时间，已经报名的同学备考一定要抓紧，不要临时抱佛脚。新东方网英语四级频道为大家整理了英语四级阅读理解单项训练习题，每天一道题考试不担心。
Today,asineveryotherdayoftheyear,morethan3000U.S.adlescentswillsmoketheirfirstcigaretteontheirwaytobecomingregularsmokersasadults.Duringtheirlifetime,itcanbeexpectedthatofthese3000about23willbemurdered,30willdieintrafficaccidents,andnearly750willbekilledbyasmoking-relateddisease.Thenumberofdeathsattributedtocigarettesmokingoutweithtsallotherfactors,whethervoluntaryorinvoluntary,asacauseofdeath.
Sincethelate1970s,whendailysmokingamonghighschoolseniorsreached30precent,smokingratesamongyouthhavedeclined.Whilethedeclineisimpressive,severalimportantissuesmustberaised.
First,inthepastseveralyears,smokingratesamongyouthhavedeclinedverylittle.Second,inthelate1970s,smokingamongmalehighschoolseniorsexceededthatamongfemalebynearly10percent.Thestatisticisreversing.Third,severalrecentstudieshaveindicatehighschooldropoutshaveexcessivelyhighsmokingrates,asmuchas75percent.
Finally,thouthsignificantdeclinesinadolescentsmokinghaveoccurredinthepastdecade,nodefinitereasonsforthedeclineexist.Withinthiscontext,theNaionalCancerInstiute(NCI)beganitscurrentefforttodeterminethemosteffecivemeasurestoreducesmokingleveslamongyouth.
1.Accordingtotheauthor,thedeathsamongyoutharemainlycausedby_____.
2.Everydaythereareover_____highschoolstrdentswhowillbecomeregularsmoker.
3.By"dropout"theauthormeans______.
a.studentswhofailedtheexamination
c.studentswholosttheirway
d.studentswhoweredrivenoutofschool
4.Thereasonfordecliningadolescentsmokingisthat________.
a.NCIhastakeneffectivemeasures
b.smokingispreventedamonghighschoolseniors
c.therearemanysmokerswhohavediedofcancer
5.Whatisimpliedbutnotstatedbytheauthoristhat________.
a.smokingratesamongyouthhavedeclinedverylittle
b.therearenowmorefemalethanmalesmokersamonghighschoolseniors
c.highsmokingratesareduetotheinceaseinwealth
d.smokingathighschoolarefromlowsocio-economicbackgrounds
答案：bdbdb
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