英语阅读理解
IFyoudonotwantpeopletoknowhowmuchyoudrink,beware.Asurgeofnewtestsonblood,urineandhaircanrevealhowmuchsomeonehasdrunknotonlyinthepastdays,butinthepastweeksandmonths.Airlinescoulduseahairtesttoinstillsafetybyidentifyingpilotswhoareheavydrinkers.Aurinetestmightallowpolicetoprovethatsomeonehadbeendrinkingwellafteranaccidenthashappened.Usedtogether,thesetoftestscouldprovideacomprehensivepictureofsomeone'sdrinkinghabits,saysFriedrichWurstoftheUniversityofBaselinSwitzerland.Wurstisheadofamultinationalteamdevelopingthetests.Alcoholitselfvanishesfromthebodywithinhours.Afterthispoint,thereareanumberofexistingmethodsoftellingwhethersomeonehasbeendrinking,butalmostallofthemrelyonindirectevidence,suchaslevelsofliverenzymes(酶)intheblood.Andnoneofthesetestsisfullyreliable.Inthepastdecade,however,variousgroupsworldwidehavebeenstudyingproductsuniquetoalcohol.Oneoftheseindicators,ethylglucuronide(EtG),startsaccumulatinginbloodasalcohollevelsdecline.Itlastsforuptofivedaysinurine,andconfirmsthatsomeonehashadadrinkinthattime.Anothertestlooksforphosphatidylethanol(PEth).PEthlastsforuptothreeweeksinthebloodofpeoplewhoconsumemorethantheequivalenttothreebeersaday.Wurst'steamhasshownitisafarmorereliableindicatorthanliver
enzymes."Wefoundnofalsenegatives,"hesays.Lookingatthecombinedlevelsoffourfattyacidethylesters(FAEEs)inhairprovidesanevenlongermeasurementofalcoholconsumption.FAEEsappearinbloodwithin12to18hoursofalcoholbeingconsumed,andendupbeingstoredinhair.Inthelateststudy,Wurst'steammonitoredaround40drinkers,andshowedthatFAEElevelsinhaircandistinguishbetweenlightandheavydrinkers."Theonlywaytoremovetheevidenceistoshaveoffallbodyhair,"saysWurst.
6.Whatisthepassagemainlyabout?
A)Howtodrinkwithoutlettingpeoplefindout.
B)Theimportanceofsafedrinking.
C)Howtoformgooddrinkinghabits.
D)Differentwaystotestalcoholinpeopleafterdrinking.
7.EtGcanlastforuptofivedaysin__________.
A)hair
B)blood
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