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    23、DNA is a nucleic acid that contains     genetic instructions used in        development and functioning of all known living organisms and some viruses.

    A．/; a         B．the; the          C．the; /         D．/; /

     

     

    23、B

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    DNA is a nucleic acid that contains     genetic instructions used in        development and functioning of all known living organisms and some viruses.

    A．/; a         B．the; the          C．the; /         D．/; /

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