单项选择题

______ is the most popular activity online.

A．Sending pages of information
B．Sending E-mail
C．Surfing the net
D．Selling the top spot
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单项选择题
The consumer group complained about ______.
A．special, fees that Internet users were charged
B．Federal Trade Commission
C．Commercial Alert
D．online search engines
单项选择题
All the following share one similarity EXCEPT ______.
A．LookSmart
B．CMGI
C．Altavista
D．Microsoft
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