A-A+
When you are going to put out a fire youA．mus
问题详情
When you are going to put out a fire, you
A．must be careful
B．should keep air away from it
C．must know it is dangerous
D．should cover it with water
参考答案
正确答案：B
解析：事实细节题。根据文章第三段的第九、十、十一句，氧气是助燃的，灭火要隔绝空气中的氧气，所以选B。
