（全国通用版）2019版高考英语大一轮复习 单元检测卷25 unit 5 first aid 新人教版必修5

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1、Unit5FirstaidⅠ.阅读理解A(2018·广西师大附属外校高三模拟)Everyday,peoplecomeintocontactwiththousandsofchemicals.Thesechemicalsaresaidtobeharmlesstohumanhealth.Infact,thechemicalsareconsideredsosafethatwewashwiththem.Weputthemonourbodiesandevenourfaces.Otherchemicalproductsareusedthroughouto

2、urhomes.Bythetimeyouwalkoutofyourfrontdoor,youhavealreadybeenexposedtothousandsofchemicals.Onitsown,eachchemicalseemsharmless.Butincombinationwithotherchemicals,theymaybecomedeadly.Thatisthefindingofatwoyearstudybyahighprofile(高调的)taskforceofscientists.Thetaskforcewastoldt

3、oinvestigatethecancercausingpossibilityofchemicalmixtures.LindaGulliverwasoneofthe174scientistsonthetaskforce.Theirjobwastostudythecancercausingpotentialof85chemicals.All85aresaidtobecommonintheenvironment.MsGulliverexplainsthatchemicalshavethepotentialorabilitytoformdange

4、rousmixtures.Evensimplemineralscanbecomedangerouswhenmixedwithchemicalsfoundinplasticsorbeautyproducts.Workingingroups,thescientistsexploredhowdifferentchemicalmixturescouldleadtocancer.MsGulliver'steamlookedattheabilityofdifferentcombinationstosupporttheincreaseofmalignan

5、t(恶性的)humancells.Shesaysthecurrentwaytoidentifywhetherchemicalscausecanceristotestthemoneatatime.Thismethodleads,sheadds,toalonglistofsupposedly“safe”chemicals.Sheandherteamsaythatapproachneedstochange.“Wedefinitelyneedcertainresearch…tofindoutwhatmixturesofchemicalswouldb

6、emoreharmfulthanothers;whatgroupsofchemicals,whentogether,wouldproducemoreharmfuleffects.Andatthemoment,thatisnotknown.”Anestimatedoneinfivecancershasbeenlinkedtochemicalexposure.Itmayturnoutthatthecancercausingvillain(恶棍)isnotasinglechemicalatall.语篇导读本文为科普说明文，揭示了多种安全的化学物质

7、相混或成致癌物。1．Whateffectmayonesinglechemicalhaveonusaccordingtothetext?A．Itmaydestroyourbody.B．Itmaynotcausedangertous.C．Itmayletussufferfromcancer.D．Itmayletourbodymakeachange.解析B　细节理解题。根据第三段第一句可知，一种化学物质可能不会对我们造成危害，故选B项。2．WhatcanwelearnaboutMsGulliver'sresearch?A．Shehasfound8

8、5cancercausingchemicals.B．Shehasfoundreasonsforfivekindsofcancers.C．Shehasfoundthatonlyon