问题
单项选择题
The danger associated with using carbon dioxide in an enclosed space is（）.
A.frostbite
B.skin burns
C.asphyxiation
D.an explosive reaction
答案
参考答案：C
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The danger associated with using carbon dioxide in an enclosed space is（）.
A.frostbite
B.skin burns
C.asphyxiation
D.an explosive reaction
参考答案：C