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问题 单项选择题

（）为用户提供访问网络的手段、网络服务、资源共享和信息的传输。

A.网络应用软件

B.网络操作系统

C.网络应用系统小

D.网络协议软件

答案

参考答案：A

选择题
The old lady's hand shook frequently. She explained to her doctor ____ this shaking had begun half a year before, and ____, only because of this, she had been forced to give up her job.

A. when; how
B. how; when
C. how; how
D. why; why
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单项选择题

《2000年国际贸易术语解释通则》中所解释的贸易术语共有（）种。

A.1

B.6

C.11

D.13
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