单项选择题

—It is sunny dy tody.So it does.B．So is it.C．So it is.D．So does it.—It is sunny dy tody.So it does. B．So is it. C．So it is. D．So does it.

A．So it does．B．So is it．C．So it is．D．So does it．

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He found his friend of a dry well. （）.

答案：答案：He found his friend at the bottom of a dry well.

单项选择题

TCP/IP协议在网络层上的协议主要是（）

A.TCP协议
B.IP协议
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