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问题 单项选择题

某网络如果只有60台主机，那么最合适的子网掩码应该是（）。

A、255.255.255.192

B、255.255.192.0

C、0.0.0.192

D、255.255.255.60

答案

参考答案：A

选择题

I don’t mind ____ alone, as I’m not good at communicating with others.

A．leaving

B．not to leave

C．to be left

D．being left
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选择题

—Does he know how to work out the problem?---Yes, he has ___ a good idea to solve it.     ----Yes, he has ___ a good idea to solve it.

A．caught up with

B．kept up with

C．come up with

D．put up with
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