【ReadingComprehensionCloningtechnologymadeitsfirstleapfromsciencefictiontosciencefactin1997.ThatyearScottishresearcherlanWilmutcreatedtheworld'sfirstanimalclone：asheepnamedDolly.InmakingDollyW】
ReadingComprehension
Cloningtechnologymadeitsfirstleapfromsciencefictiontosciencefactin1997.ThatyearScottishresearcherlanWilmutcreatedtheworld'sfirstanimalclone：asheepnamedDolly.InmakingDollyWilmutdefied(对…挑战)naturebecauseDollywasproducedwithouttheunionofmaleandfemalesexcells.
ThemethodthatWilmutusedtocreateDollyisneitheratop-secretnorhardtounderstand.Firstheremovedaneggcellfromanadultfemalesheep.Thenheusedafineneedletosuckout(吸出)theegg'snucleus(细胞核)thestructurethathousesacell'sDNA(deoxyribonucleicacid(脱氧核糖核酸).DNAcontainsthebiologicalmaterialthatdetermineswhatanorganismlookslikeandhowitfunctions.
NextWilmutremovedaskincellfromanothersheep－thesheephewishedtocopy.Placingtheemptyeggcellandtheskincellsidebysideheforcedthetwocellstofusebyzapping(用辐射线照射)themwithacharge(电荷)ofelectricity.BydoingthatWilmutcreatedaneggfromoneanimalthatcontainedtheDNAofanother.
Theneweggcelldividedanddevelopedintoanembryo(胚胎).Wilmutthenimplanted(移植)theembryoinhewomb(子宫).Intimetheembryodevelopedintoalambsheep－Dolly.
Foryearslaterawholebarnyardofanimalcloneincludingsheepmicecowspigsandgoatshascometolifeinlabsaroundtheglobe.Nowtheraceisonhowtoproducethefirsthumanclonealthoughmanypeoplearestronglyagainstit.
1．Whatdoesthefirstsentenceinthepassagemean?
[]
A．Cloningtechnologymadeitsfirstappearanceinsciencefictionin1997.
B．Cloningtechnologymadeitpossibletoturnsomethinginthestoryintorealityin1997.
C．Clothingtechnologywasasciencefactthatwasacceptedforthefirsttimein1997.
D．Cloningtechnologywasthefirsttechnologyusedincreatingareallifein1997.
2．ThetechniqueWilmutusedtocloneDolly
[]
A．israrelyunderstoodbyotherscientists
B．wasusedbyscientistsbefore
C．isasecrettotheworld
D．isnoneoftheabove
3．Howimportantisone'sDNA?
[]
A．One'sappearanceandbehaviordependonhisDNA.
B．Thelengthofone'slifedependsonhisDNA.
C．One'scha