防止间接电击的措施有（）。
A、绝缘
B、屏护
C、工作接地
D、保护接地
E、保护接零
F、保护开断
参考答案：D, E, F
Nowadays ______ Internet is becoming increasingly popular and ______ new high speed broadband network was recently started.
A．a; the
B．the; a
C．a; a
D．the; the
— What is it?
— ___________________[ ]
A. I'm hungry.
B. I'm thirsty.
C. It's a table.
