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问题 选择题

I received his mother’s telephone call at eleven．    that he was badly hurt in an accident yesterday．   

A．Then did I know

B．Only then I knew

C．Only then did I know

D．Only then knew I

答案

答案：C

问答题 简答题

有人认为“计划没有变化快，所以制订计划没有意义”。你对这种看法如何评价？
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单项选择题

An internet is a combination of networks connected by (1).When a datagram goes from a source to a(2)，it will probably pass many (3)until it reaches the router attached to the destination network. A router receives a (4)from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet? The decision is based on optimization: Which of the available (5)is the optimum pathway?

空白（4）处应选择（）

A.destination

B.resource

C.packet

D.source
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