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
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单项选择题
All the following share one similarity EXCEPT______.
A．LookSmart
B．CMGI
C．AltaVista
D．Microsoft
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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