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C.washonestD.madeamistake B LastAugust,JoeandMaryMahoneybeganlookingatcollegesfortheir17-year-olddaughter,Maureen.Withachecklistofcriteria(衡量标准)inhand,theDallasfamilylookedaroundthecountryvisitinghalfadozenschools.Theysoughtauniversitythatofferedtheteenager’sintendedmajor,onelocatednearalargecity,andacampuswheretheirdaughterwouldbesafe. “Thesafetyissueisabigone,”saysJoeMahoney,whoquicklydiscoveredhewasn’taloneinhisworries.Oncampustoursotherparentsvoicedsimilarconcerns,andthesamequestionwasalwaysasked:whataboutcrime?Butwhencollegeofficialsalwaysgavethesameanswer-----“That’snotaproblemhere,”-----Mahoneybegantofeeluneasy. “Nocrimewhatever?”commentsMahoneytoday.“Ijustdon’tbuyit.”Norshouldhe:in1999theU.S.Departmentofeducationhadreportsofnearly400,000seriouscrimesonoraroundourcampuses.“Parentsneedtounderstandthattimeshavechangedsincetheywenttocollege,”saysDavidNichols,authorofCreatingaSafeCampus.“Campuscrimemirrorstherestofthenation.” Butgettingaccurateinformationisn’teasy.Collegesmustreportcrimestatistics(统计数字)bylaw,butsomeholdbackforfearofbadpublicity(关注),leavingthehonestoneslookingdangerous.“Thetruthmaynotalwaysbeserious,”warnsS.DanielCarterofSecurityonCampus,Inc.,thenation’sleadingcampussafetywatchdoggroup. Tohelpconcernedparents,Carterpromisedtovisitcampusesandtalktoexpertsaroundthecountrytofindoutmajorcrimeissuesandeffectivesolutions. 60.Itisoftendifficulttogetcorrectinformationoncampuscrimebecausesomecolleges____. A.receivetoomanyvisitorsB.mirrortherestofthenation C.hidethetruthofcampuscrimeD.havetoomanywatchdoggroups 61.Theunderlinedword“buy”inthethirdparagraphmeans_____. A.mindB.admitC.believeD.expect 62.Welearnfromthetextthat“thehonestones”inthefourthparagraphmostprobablyreferstocolleges_____. A.thatareprotectedbycampussecurityB.thatreportcampuscrimesbylaw C.thatarefreefromcampuscrimeD.thatenjoyverygoodpublicity 63.Whatisthetextmainlyabout? A.Exactcampuscrimestatistics.B.Crimesonoraroundcampuses. C.Effectivesolutionstocampuscrime.D.Concernsaboutkids’campussafety. C Asifthereweren’tenoughofthemintheworldalready,scientistshavesucceededincloningflies.Thealikefruitfliesarethefirstinsectsevercloned,saystheCanadianteamthatcreatedthem.Thequestioneveryoneasksiswhyanyonewouldwanttoclonefliesinthefirstplace.Shehopesthattheinsects,whichareveryeasytoexperimentwith,willhelptoadjustthecloningprocessinotheranimalsandeveninhumans,wherethetechniqueisbeingresearchedtoaidproductionoftherapeutic(治疗的)stemcells. Incloning,theDNA-containingnucleusofanadultcellisinjectedintoaneggwhoseownnucleus(细胞核)hasbeenremoved.Atthemoment,themajorityofclonedmice,sheepandotheranimalsdiebeforebirth.ItisthoughtthisisbecausetheadultDNAisnotproperly‘reprogrammed’. Usingflies,researchersmightdiscovergenesthatareimportantforthisreprogramming,andthathavematchesinotheranimals.Thatisbecauseitisrelativelyeasyinfliestoknockoutthefunctionofasinglegeneandthenattemptcloningwiththesecells,whichwilltestwhetherthatgeneisimportant.Ifsuchgenesareconfirmed,thenintheoryclonedmammalianembryos(晶胚)mightbegrowninselectedsolutionsthatchangetheactivityofthosegenestoimprovethetechnique’ssuccessrate.Althoughsomegroupshaveattemptedtocloneinsectsbefore,Lloydsaysthisisthefirsttimeithasbeensuccessful.Theteamusedaslightdifferenceonthestandardcloningprocess:theytransferrednucleitakenfromembryosratherthanfully-grownadultcells.Theysuckedseveralnuclei(pl)outofdevelopingflyembryos,andinjectedthemintoafertilized(已受精的)flyegg.Fromover800earlyattempts,theyclonedfiveadultinsects,thegroupreportsinthejournalGenetics. 64.Thebesttitleofthispassageprobablyis_______. A.Theimportanceofclone B.Firstinsectsarecloned C.Thedisagreementinclone D.Theadvantagesofclone 65.Thescientistsclonedfliesbecause________. A.therearefewerandfewerfliesintheworld B.fliesareeasytofindandcheaptouse C.theycangainsomeexperiencebeforecloningotheranimals D.itissafetocloneflies 66.Thefailureofmostclonedanimalsisdueto_______. A.thedifferenceofotheranimals’genes B.theimpropertechniqueofclone C.thecomplexofotheranimals D.theimproperrearrangeoftheadultgene (责任编辑：admin) |