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              human nose is          under – rated tool. In other words, we are better smellers than we think we are .

    A．A; a   B．The ; the   C．The; a      D．The; an

    D

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    B. committed

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    B. ignoring

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    D. tracking

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    B. discovering

    C. determining

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    B. reserved

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    D. refused

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    B. information

    C. messages

    D. signals

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    B. left

    C. drawn

    D. exposed

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    B. expression

    C. extension

    D. explanation

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    B. competitive

    C. inefficient

    D. adequate

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    B. gather

    C. develop

    D. produce

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    B. sick

    C. aware

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    C. neglect

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