资源描述：
《英语四级阅读练习及问题详解.doc》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、英语四级阅读练习及答案PassageOne:Asthehorizonsofsciencehaveexpended,twomaingroupsofscientistshaveemerged.Oneisthepurescientist,theother,appliedscientist.Thepureortheoreticalscientistdoesoriginalresearchinordertounderstandthebasiclawsofthenaturethatgovernourworld.Theappl
2、iedscientistadaptsthisknowledgetopracticeproblems.Neitherismoreimportantthantheothers,however,forthegroupsareverymuchrelated.Sometimes,however,theappliedscientistfindsthe“problems”forthetheoreticalscientisttoworkon.Let’stakeaparticularproblemoftheaircraftindu
3、stry:heat-resistantmetals.Manyofthemetalsandalloysthatperformsatisfactorilyincarcannotbeusedinajet-propelled(喷气推进式)plane,Newalloysmustbeused,becausethejetengineoperatesatamuchhighertemperaturethananautomobileengine.Theturbinewheel(涡轮)inaturbojet(涡轮喷气发动机)mustw
4、ithstandtemperaturesashighas1,600degreesFahrenheit,soaircraftdesignershavetoturntotheresearchmetallurgistforthedevelopmentofmetalsandalloysthatwoulddothejobinjet-propelledplanes.Divingscientistsintotwogroups-pureandapplied-isonlyonebroadwayofclassifyingthem,h
5、owever.Whenscientificknowledgewasverylimited,therewasnoneedformentospecialize.Today,withthegreatbodyofscientificknowledge,scientistsspecializeinmanydifferentfields.Withineachfield,thereisevenfurthersubdivision.And,withfinerandfinersubdivisions,thevariousscien
6、ceshavebecomemoreandmoreinterrelateduntilnobranchisentirelyindependentoftheothers.Manynewspecialties-geophysicsandbiochemistry,forexample-haveresultedfromcombiningtheknowledgeoftwoormorescience.1.Theappliedscientist A) doesoriginalresearchtothebasiclaw
7、sofnature B) appliedtheresultofresearchtopracticalproblemsC) providesthebasicknowledgeforthepurescientistD) isnotinterestedinpracticalproblems2.Theexamplegiveninthethirdparagraphillustrateshow A) purescienceoperatesindependentlyofapplied
8、scienceB) theappliedscientistdiscoverthebasiclawsofnatureC) appliedsciencedefinesalltheareasinwhichbasicresearchisdoneD) appliedsciencesuggestsproblemsforthebasicscientist
