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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