单选题：DNA testing was first used in a criminal case by

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DNA testing was first used in a criminal case by A．a lawyer in New York
B．students in Illinois
C．doctors in the United States
D．police in Great Britain

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it can be inferred from the last paragraph that brown dwarfs

it can be inferred from the last paragraph that brown dwarfs A．give off infrared

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paragraph 3________

paragraph 3________ A．What are noble gases? B．what is the periodic table? C．What

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What helps a person to do a particular task better in visual

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证券交易是已发行的证券在证券市场上买卖的活动。（　　）

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