通信电源专业的作用？
参考答案：
保证为通信设备提供不间断地供电，保持供电质量符合标准。
The explanation of our teacher will make the reading easy ______.
A．to be understand
B．to understand
C．understood
D．understanding
—Why do you put up these English cards on the wall?
—Only in this way _________the English words.
A．I can remember
B．can I remember
C．I remember
D．remember I
