第二节：完形填空（共20小题；每小题1.5分，满分30分）
Whatisinthedrugthatmakesyousickordead?Forexamplecocaineisharmfulbutwhatmakesitharmful?
Ican’ttellyouallaboutdrugsbutIcan___36___youthinkabouttheminthis____37____way.Yourbodyisaverycomplicatedmachine____38____alotofchemicalmachineryallofwhichisfinallyturned____39____itallworkstogether.Specialchemicalswhichwecalldrugscanaffectitinmanydifferentways.
Somedrugsare____40____whenyourbodyhasaproblemaswithdisease—causingbacteria.Thensomeonemaygiveyouaspirintokeepyourtemperaturefromgoingtoo____41____orsomepenicillin(青霉素)____42____itstopsthegrowthofsomekindsofbacteria.___43_____alldrugsarereallypoison____44_____ifyoutaketoomuchsoyoumustalwaysusethem____45____.
Whydosomepeopletakedrugslikecocaine?Foralittlewhiletheyseemtomakeyoufeelbetterorhappier.But____46____theireffectshave____47____yourbodyhastopayanextra____48____togetbacktonormal.Thatmakesyouwanttoget____49____ofthedrug.
Drugslikecocainehavetheirspecialeffectsbecausetheyactas____50____foryournervoussystem.Theycutoffsomeofyournervepathwaysandtakeawaysomeofyoursensesandyour____51___.Theymakeyouwantalwaysmore.Andjustalittletoomuchcaneven____52____nervestoyourheartandstopitsbeating
Manyofusworryaboutthe____53____aroundusandwhatpollutiondoestous.Howaboutyourinternalenvironmentandwhatgoeson____54____you?Youcontrolthatallbyyourselfinwhatyouputintoyour____55_____.Mostdrugsarepollutants.Youwouldnotwantpollutantsintheairandwateraroundyou.Whywouldyouwantpollutantsinyourbody?
36. A. make B. cause C. helpD. let
37. A. funny B. different C. simple D. true
38. A. just B. really C. especially D. sometimes
39. A. asif B evenif C. where D. sothat
40. A. powerfulB. helpful C. painful D. helpless
41. A. highB. tall C. much D. hot
42. A. when B. untilC. as D. before
43.