单项选择题

Which of the following will affect the voice quality through Internet（）

A．The speed of your voice.
B．The speed of the Internet.
C．The Internet traffic.
D．The service of the operator.

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单项选择题

In Paragraph 1, the word skeptical means（）

A．doubtful
B．worried
C．sad
D．angry

单项选择题

The main purpose for the author to write this passage is（）

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