2. 外语
  3. People prefer IP phone calls to ordinary ones because the former is ______. The main purpose for the author to write this passa

People prefer IP phone calls to ordinary ones because the former is ______. The main purpose for the author to write this passa

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问题 People prefer IP phone calls to ordinary ones because the former is ______.
The main purpose for the author to write this passage is ______.
选项 A、to introduce a new technology called VoIP
B、to inform that IP phone calls are sometimes quite awful
C、to tell us that IP calls are dependent on personal computers
D、to compare the IP calls with the traditional phone calls
答案A
解析
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