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【单选题】
五层协议的网络体系结构中,___ 负责为分组选择合适的路由,使源主机运输层所传下来的分组能够交付到目的主机。A.
应用层
B.
运输层
C.
网络层
D.
物理层
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【简答题】局域网常用的拓外结构有()、()和 () 三种。
【单选题】For some reason, it __________ all day over the two weeks.
A.
rained
B.
rains
C.
was raining
D.
has been raining
【单选题】.Mary was _________ the letter from Tom,but it didn’t reach her for some reason.
A.
expecting
B.
waiting
C.
hoping
D.
longing
【简答题】For some people, it may be better ________. A) to wear a seat belt for health reasons B) not to wear a seat belt for health reasons C) to get valid medical certificate before wearing a seat belt D) to...
【单选题】“You ________ have a wrong number，”she said.“There's no one of that name here.”
A.
need
B.
can
C.
must
D.
would
【简答题】For some reason, it takes constant reminders that we primates （灵长目）need nurturing. In a recent study of 46 baby chimpanzee （黑猩猩）orphans, Kim Bard of the University of Portsmouth in England and her col...
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