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      HaveyoueverheardanewsreportertalkaboutDNA?Reporte...

  •       HaveyoueverheardanewsreportertalkaboutDNA?Reporte...

  • 问题详情：      HaveyoueverheardanewsreportertalkaboutDNA?ReporterstalkaboutDNAfoundatthesceneofacrime．TheytalkaboutpolicefindingDNA“fingerprints．”PolicesometimesuseDNAasacluetofindoutwhocommittedthecrime．      DNAisasubstance（物质）thatmakesup...
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