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    Smoking is one of the causes of cancer, killing millions of people each year. A) commercial B) similar C) major 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.
    [      ]
    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. 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. 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．major

    B．similar

    C．commercial

    D．chemical

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