DNAFingerprinting DNAisthegeneticmaterialfoundwithinthecellnucleiofalllivingthings.InmammalsthestrandsofDNAaregroupedintostructurescalledchromosomes.W...
ElectronicMail（E-mail） Duringthepastfewyears,scientiststheworldoverhavesuddenlyfoundthemselvesproductivelyengagedintasktheyoncespenttheirlivesavoiding...
Ebbysemeyer—KingofCurrents OnDecember9,1994,theHuundaiSeattle,alargefreighter,lost49containersofcargoduringastorminthemiddleofthePacificOcean.Amongthe...
EattoLive Ameagerdietmaygiveyouhealthandlonglife,butit’snotmuchfun—anditmightnotevenbenecessary.Wemaybeabletohangontomostofthatyouthfulvigorevenifwedo...
TheWasteland AnewcatastrophefacesAfghanistan.TheAmericanbombingcampaignisconspiringwithyearsofcivilconflictanddroughttocreateanenvironmentalcrisis. Hu...
Snowflakes You’veprobablyheardthatnotwosnowflakesarealike.Ofcourse,nobodyhaseverconfirmedthatstatementbyexaminingeveryoneoftheestimatedoneseptillionsn...
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答案:16 B17 C18 A19 A20 B21 A22 C...
答案:16 B17 A18 C19 B20 A21 B22 C...
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