A．电熨斗
B．微波炉
C．电饭锅
D．电烤箱
答案：B
If we don’t save energy, it _____ some day.
A．will be run out
B．has been run out
C．will run out
D．has run out
计算：5（a2b-3ab2）-2（2a2b-7ab2）
