专升本考试

【单选题】 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 only

网考网参考答案：B
网考网解析：
由第3段中Fires need oxygen．Without oxygen they will die，说明了火要燃烧需要氧气，没有氧气火就会熄灭。所以要灭火就要隔绝空气，答案选B。 查看试题解析出处>>