Arecentannouncementbyscientiststhattheyhavesuccessfullyclonedthefirsthumanembryohascausedmuchdebateandhasshockedmanypeoplearoundtheworld.Ontheonehand，somescientistspointoutthatifyoucloneanembryo，youcanproducevaluabletissues(组织）andorgansthatcouldbeusedtosavehumanlives.Ontheotherhand，manypeople，includingsomescientistsdisagreeandfearthatifmankindinterfereswith（干涉）natureinthisway，theymaybeontheirwaytoproducingareal-lifeFrankenstein’smonster.

Cloningisproducinganexactcopyofaplantorananimalusingitscells.ThefirstmammaltobeclonedsuccessfullyfromanadultcellwasDollythesheep.Shewasbornin1996anddiedinearly2003，atamuchyoungeragethannormal.Whenshewasborn，manypeoplewereangrybecausetheythoughtcloningwouldcreatemorediseaseintheanimalworld.However，ingeneralthescientistswerepraisedfortheirwonderfulscientificbreakthrough.

TheScottishscientistwhocreatedDolly，IanWilmut，isshockedthatsomescientistsarenowconsideringcloninghumanbeings.Althoughheresearchescloning，hisintentionhasneverbeentocreatecopiesofhumans.Instead，hethinksresearcheffortsshouldconcentrateoncreatingnewtissuesandorgansthatcouldeventuallybeusedtocurediseaseslikecancer.However，somepeopleconsiderthatcloninghumanembryoswiththeintentionofdestroyingthemshowsnorespectforhumanlife.

Whilecloninghumanembryosisillegalinmanycountries，somescientistsarealreadypushingaheadwithresearchsoastodeliveraclonedhumanbaby.SeverinoAntinori，anItaliandoctor，isoneoftheleadersinthiskindofresearch.Hehasdeclaredthathewantstobethefirsttocloneahumanbeing.

InChina，scientistshavefocusedtheireffortsoncloninganimals，aswellassterncellstobeusedinmedicalresearch.Chinahassucceededinproducingclonesofcowsandgoats，andcontinuestoresearchwaysinwhichcloningcanbenefitmankind.

51.WhichofthefollowingstatementsaboutcloningisTRUEaccordingtothepassage?

A.Cloningtechnologycanonlybeappliedtoanimals.

B.Aclonedanimalcanlivelongerthananormalone.

C.PeopleallovertheworldarehappyaboutthebirthofDolly.