______ cannot live without oxygen. [br] Which is more important for the burning

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问题 ______ cannot live without oxygen. [br] Which is more important for the burning of a fire?

选项 A、Pure oxygen.
B、Air.
C、Coal.
D、Wood.

答案 B

解析本题题干问“对于燃烧来说什么更加重要”。原文第3段指出空气中有足够的氧气可供燃烧，纯氧会让燃烧变快导致浪费。因此选项B．Air是正确答案。

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