电流如不经过（）或用电设备而由电路中途向搭铁外通过或直接流入回路中，这种情况叫做短路。
参考答案：电阻
I was sleeping when the telephone rang again.It was the third time that I ________ that night.
A．have been interrupted
B．had been interrupted
C．interrupted
D．had interrupted
馒头谁发明的？（）
A.李冰
B.诸葛亮
C.曹操
D.屈原
