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    Farming, ________ to human welfare, is now a small part of the economy of the country．

    [　　]
    A．

    essential as it is

    B．

    essential as is

    C．

    it is essential

    D．

    as essential

    答案：A
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      71  of fashion

     

           

     

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    Ethical

     

    Working   73   involved

     

     

     

     

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      78   to problems

     

     

     

     

     

     

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    ___80__

     

     

    Selecting environmentally friendly clothing

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