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    15．Smoking is one of the causes of cancer.killing millions of people each year. A．major B．similar C．commercial D．chemical 【查看更多】

     

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    Smoking is one of the ________causes of cancer，killing millions of people each year.

    A．major

    B．similar

    C．commercial

    D．chemical

     

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    Smoking is one of the ________causes of cancer，killing millions of people each year.


    1. A.
      major
    2. B.
      similar
    3. C.
      commercial
    4. D.
      chemical

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     Smoking is one of the ________causes of cancer，killing millions of people each year.

    A. major  B. similar  C. commercial    D. chemical

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    Smoking is one of the ________causes of cancer，killing millions of people each year.

    A．majorB．similarC．commercialD．chemical

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