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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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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