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    If you feel dizzy in a coal-burning room, that’s lack of . Please open the window and air the room at once. A. onion B. hydrogen C. oxygen D. carbon-dioxide 【查看更多】

     

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    216. If you feel dizzy in a coal-burning room, that’s lack of    . Please open the window and air the room at once.

    A. onion__________    B. hydrogen__________       C. oxygen              D. carbon-dioxide

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    If you feel dizzy in a coal-burning room, that’s lack of　 . Please open the window and air the room at once.

    A. onion　　　　　 B. hydrogen　　　　 C. oxygen　　　　 D. carbon-dioxide

     

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