发生电火灾后,产生应该做的是( )
A:用水灭火
B:用灭火器灭火
C:用砂子灭火
D:切断电源并拔打119火警电话
A (n) is a group of words whose meaning is different from the meaning of each word understood on its own.
下列句中加线的虚词用法和意义都相同的一组是( )
“一猪生九子,连母一个样”,说明了自然界中普遍存在着( )的现象.