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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2. （）
A.being
B.be
C.been
D.is -
单项选择题
1. （）
A.No one
B.Someone
C.Everyone
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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？（）
A.Network layer
B.Layer 1
C.Transport layer
D.Layer 5
