历年考研英语模拟试题及答案：阅读篇

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1、历年考研英语模拟试题及答案：阅读篇　　Scientistshaveknownsince1952thatDNAisthebasicstuffofheredity.They'veknownitschemicalstructuresince1953.TheyknowthathumanDNAactslikeabiologicalcomputerprogramsome3billionbitslongthatspellsouttheinstructionsformakingproteins，thebasicbuildingblocksoflif

2、e.　　Buteverythingthegeneticengineershaveaccomplishedduringthepasthalf-centuryisjustapreambletotheworkthatCollinsandAndersonandlegionsofcolleaguesaredoingnow.CollinsleadstheHumanGenomeProject，a15-yearefforttodrawthefirstdetailedmapofeverynookandcrannyandgeneinhumanDNA.A

3、nderson，whopioneeredthefirstsuccessfulhumangene-therapyoperations，isleadingthecampaigntoputinformationaboutDNAtouseasquicklyaspossibleinthetreatmentandpreventionofhumandiseases.　　Whattheyandotherresearchersareplottingisnothinglessthanabiomedicalrevolution.LikeSiliconVa

4、lleypiratesreverse-engineeringacomputerchiptostealacompetitor'ssecrets，geneticengineersaredecodinglife'smolecularsecretsandtryingtousethatknowledgetoreversethenaturalcourseofdisease.DNAintheirhandshasbecomebothablueprintandadrug，apharmacologicalsubstanceofextraordinary

5、potencythatcantreatnotjustsymptomsorthediseasesthatcausethembutalsotheimperfectionsinDNAthatmakepeoplesusceptibletoadisease.　　Andthat'sjustthebeginning.Forallthefeveredworkbeingdone，however，scienceisstillfarawayfromtheBraveNewWorldvisionofengineeringaperfecthuman—oreve

6、naperfecttomato.Muchmoreresearchisneededbeforegenetherapybecomescommonplace，andmanydiseaseswilltakedecadestoconquer，iftheycanbeconqueredatall.　　Intheshortrun，themostpracticalwaytousethenewtechnologywillbeingeneticscreening.DoctorswillbeabletodetectallsortsofflawsinDNAl

7、ongbeforetheycanbefixed.Insomecasestheknowledgemaylead　　totreatmentsthatdelaytheonsetofthediseaseorsoftenitseffects.Someonewithageneticpredispositiontoheartdisease，forexample，couldfollowalow-fatdiet.Andifscientistsdeterminethatavitalproteinismissingbecausethegenethatwa

8、ssupposedtomakeitisdefective，theymightbeabletogivethepatientanartificialversionoftheprotein.Butinotherinstances，almos