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1、北京科技大学远成学院2009－2010年第2学期《大学英语1》试题辅导1姓名：班级：学号：题目一二三四五分数注意事项：*答题卡中考试类型都涂成A卷答试卷一前，考生务必将自己的姓名、准考证号、考试科目用铅笔涂写在机读卡上。每小题选出答案后，用铅笔把机读卡上对应题目的答案标号涂黑。如需改动，用橡皮擦干净后，再选其它答案标号。不能答在试卷上。PartIReadingComprehension（30%）Directions:Therearethreepassagesinthispart.Eachpassageisfollowedbysomequestionsorunfini
2、shedstatements.ForeachofthemtherearefourchoicesmarkedA,B,CandD.YoushoulddecideonthebestchoiceandblackenthecorrespondingletterontheAnswerSheet.PassageOne“Ihavegreatconfidencethatbytheendofthedecadewe’llknowinvastdetailhowcancercellsarise,”saysmicrobiologistRobertWeinberg，anexpertoncance
3、r.“But,”hecautions,“somepeoplehavetheideathatonceoneunderstandsthecauses,thecurewillrapidlyfollow.ConsiderPasteur.Hediscoveredthecausesofmanykindsofinfections,butitwasfiftyorsixtyyearsbeforecureswereavailable.”Thisyear，50percentofthe910000peoplewhosufferfromcancerwillsurviveatleastfive
4、years.Intheyear2000,theNationalCancerInstituteestimates,thatfigurewillbe75percent.76)Forsomeskincancers，thefive-yearsurvivalrateisashighas90percent.Butothersurvivalstatisticsarestilldiscouraging–13percentforlungcancer，and2percentforcancerofthepancreas(胰腺)．Withasmanyas120varietiesinexis
5、tence,discoveringhowcancerworksisnoteasy.Theresearchersmadegreatprogressintheearly1970s,whentheydiscoveredthatoncogenes,whicharecancer-causinggenes(基因)，areinactiveinnormalcells.Anythingfromcosmicraystoradiationtodietmayactivateadormantoncogene,buthowremainsunknown．Ifseveraloncogenesare
6、drivenintoaction，thecell，unabletoturnthemoff，becomescancerous．77)Theexactmechanismsinvolvedarestillmysterious,butthelikelihoodthat第30页共30页manycancersareinitiatedatthelevelofgenessuggeststhatwewillneverpreventallcancers.“Changesareanormalpartoftheevolutionaryprocess,”sayoncologistWillia
7、mHayward.Environmentalfactorscanneverbetotallyeliminated;asHaywardpointsout,“Wecan’tprepareamedicineagainstcosmicrays.”Theprospectsforcure,thoughstilldistant,arebrighter.“First,weneedtounderstandhowthenormalcellcontrolsitself.Second,wehavetodeterminewhethertherearealimitednumberofgen
