Place the mask over your nose and mouth and slip the plastic bag over your head. In a few seconds, the（）will begin to flow.<br>A.Water <br>B.air<br>C.oxygen

Place the mask over your nose and mouth and slip the plastic bag over your head. In a few seconds, the（）will begin to flow.
A.Water
B.air
C.oxygen

出自：2023《国家开放大学》题库及答案

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