网络通信介质包括有线介质与无线介质，但（）目前还不是网络传输介质。
A、声波
B、微波
C、光缆
D、无线电波
参考答案：A
Believe me! This new invention will bring you great ________like a goldmine.[ ]
A．benefit
B．interest
C．profit
D．talent
—______your mother going shopping this evening?
—No, she ______. She may go to the cinema.[ ]
A. Will; won’t
B. Is; doesn’t
C. Does; doesn’t
D. Is; isn’t
