2019-2020年高一英语下学期周练试题承智班

2019-2020年高一英语下学期周练试题承智班一、阅读理解Smoking is harmful. But as soon as you quit the habit, everything will

2019-2020年高一英语下学期周练试题承智班 一、阅读理解 Smokingisharmful.Butassoonasyouquitthehabit,everythingwillbeOK,right? Wrong. Newresearchhasfoundthatevenifyougiveupsmoking,thedamageithasdoneto yourgenes(基因)willstaythereforamuchlongertime. Intheresearch,ateamofUSscientistsstudiedthebloodof16,000people.Among them,someweresmokers,someusedtosmoke,andtherestwerenon-smokers.Scientists paredtheirgenesandfoundthatmorethan7,000genesofsmokershadchanged-anumber thatisone-thirdofknownhumangenes. AccordingtoNBCNews,bothheartdiseaseandcancerarecausedbygeneticchanges. Somepeoplemayhavehadthechangeswhentheywereborn,butmostpeoplegetthemin theirday-to-dayliveswhiledoingthingslikesmoking. Whenyoustopsmoking,alotofthesegeneswillreturntonormalwithinfiveyears. Thismeansyourbodyistryingtoheal(治愈)itselfoftheharmfuleffectsofsmoking. Butthechangesinsomeofthegenesstayforlonger.Theycanstayforaslongas30 years.It’salmostlikeleavingafootprintonwetcement(水泥)一itwillalwaysbe there,evenwhenyou’vewalkedawayandwhenthecementbeesdry. Althoughthestudyresultsmaymakepeopleunhappy,thereisabrightside:the findingscouldhelpscientistsinventmedicinetotreatgeneticdamagecausedby smokingorfindwaystotellwhichpeoplehaveheartdiseaseorcancerrisks. 1．ThefunctionofParagraph1isto. A.giveanexampleB.introducethetopicofthepassage C.makeanargumentD.showthemainideaofthepassage 2．Mostgeneticchangeshappenbecauseof. A.people’sconditionatbirthB.environmentalpollution C.people’sbadlivinghabitsD.heartdiseaseandcancer 3．Theunderlinedword“it”inParagraph6refersto. A.thecementB.thefootprint