2017年6月大学英语四级考试阅读理解单项训练（2）思维导图
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。
树图思维导图提供 2017年6月大学英语四级考试阅读理解单项训练（2） 在线思维导图免费制作，点击“编辑”按钮，可对 2017年6月大学英语四级考试阅读理解单项训练（2） 进行在线思维导图编辑，本思维导图属于思维导图模板主题，文件编号是：b669bce8813b0605476e43cb6070be63
思维导图大纲
2017年6月大学英语四级考试阅读理解单项训练（2）思维导图模板大纲
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_____.
a.trafficaccidents
b.smoking-relateddesease
c.murder
d.allofthese
2.Everydaythereareover_____highschoolstrdentswhowillbecomeregularsmoker.
a.75b.23c.30d.3000
3.By"dropout"theauthormeans______.
a.studentswhofailedtheexamination
b.studentswholeftschool
c.studentswholosttheirway
d.studentswhoweredrivenoutofschool
4.Thereasonfordecliningadolescentsmokingisthat________.
a.NCIhastakeneffectivemeasures
b.smokingispreventedamonghighschoolseniors
c.therearemanysmokerswhohavediedofcancer
d.noneofthese
5.Whatisimpliedbutnotstatedbytheauthoristhat________.
a.smokingratesamongyouthhavedeclinedverylittle
b.therearenowmorefemalethanmalesmokersamonghighschoolseniors
c.highsmokingratesareduetotheinceaseinwealth
d.smokingathighschoolarefromlowsocio-economicbackgrounds
答案：bdbdb
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