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【单选题】
在 TCP/IP 协议簇的层次中,解决计算机主机之间通信问题是在A.
网络接口层
B.
网际层
C.
传输层
D.
应用层
手机使用
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反馈参考答案：
举一反三
【单选题】John plays the piano _____, if not better than, David. But he never shows off in public.
A.
as well
B.
as well as
C.
so well
D.
so well as
【单选题】一Why is John so poor at his lessons? 一He never studies ，he plays computer games all day
A.
However
B.
Except
C.
Instead
D.
Anyway
【简答题】—Is the man our sales-manager? —No,it _________ not be him.He never plays cards. A．must B．can C．will D．may
【单选题】Faced with a bill for $10,000，________.
A.
an extra job has been given to John
B.
the boss has given John an extra job
C.
an extra job has been taken
D.
John has taken an extra job
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