20xx牛津譯林版九年級(jí)上冊(cè)u(píng)nit8detectivestoriesperiod6隨堂練習(xí)(存儲(chǔ)版)
【正文】 if one of them is the robber. Many criminals leave something of themselves at the places of the c 4 like a fingerprint or a hair． Or they take something away on their s 5 or clothes, like dirt or animal hair． If they leave behind some of their b 6 or their hair or a piece of skin, it will have their DNA inside it. Everyone’s DNA is different and their f 7 are also different． So, if a criminal cuts himself during a robbery or leaves his hair, or e 8 a small piece of skin, scientists can find out what his DNA is． The police can then ask the s 9 to give them his hair or some blood and see w 10 it has the same DNA． Many crimina
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