题目内容

Please stop , boys, I have something important to you.

A. saying ...talk
B. telling ... say
C. talking ...speak
D. talking ... tell

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Tony, would you go and see if Sam has any difficulty ____ his tape recorder?

A. to fix
B. fixing
C. for fixing
D. fix

“Why isn't Nancy going to meet us?”“It's my fault. I forgot all about ____ her.”

A. telephoning to
B. to telephone
C. to telephone to
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光纤作为传输介质，具有以下的优势

A. 保密性高
B. 传输的速率高
C. 传输距离长
D. 衰减很小

按照接入网室外传输设施中是否含有源设备，光接入网可分为（）和（）两种网络。

A. 电信管理网
B. 有源光网络
C. 无源光网络
D. 用户驻地网