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【单选题】
数据链路协议HDLC是一种（）。A.
面向比特的同步链路控制协议
B.
面向字节计数的同步链路控制协议
C.
面向字符的同步链路控制协议
D.
异步链路控制协议
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反馈参考答案：
举一反三
【单选题】—May I keep your company there? —You may_________.
A.
if you like
B.
as you like
C.
if you’d like
D.
if you like to
【单选题】_____, I think, and the problem can be settled.
A.
If you double your efforts
B.
If you make greater efforts
C.
If you spare no efforts
D.
Some more efforts
【单选题】You have to be patient if you want to sustain your position
A.
maintain
B.
better
C.
acquire
D.
support
【单选题】If your meal costs 5 dollars and if you. want to tip the waiter before you leave, you can pay the restaurant ______ dollars.
A.
5.5
B.
5
C.
6
D.
4
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