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外语考试试题及答案解析

单项选择题

案例分析题

__________(1)wrote，“Friendships are，from year to year，the best of all life's treasures.”But__________(2)a good friend to someone is never simple or easy.It__________(3)wisdom and lots of hard work.Demanding that a friend give his full attention__________(4)you can destroy a relationship.Let your friend decide for himself __________(5)to spend time with.

3. （）

A.required
B.requires
C.require
D.requiring

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单项选择题 Hardware networking devices operate within the protocol stack just like protocols them-selves.Thus，hardware networking devices can be associated with an OSI model layerrelated to the protocols they manage or control.At which layer of the OSI model does arouter operate？（）

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