If you feel dizzy in a coal-burning room, that’s lack of . Please open the window and air the room——青夏教育精英家教网—

摘要： 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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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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