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
All the following share one similarity EXCEPT______.
A．LookSmart
B．CMGI
C．AltaVista
D．Microsoft
单项选择题
The primary aim of some companies' sponsoring the search engines is to______.
A．cash in on their important role as Web guides
B．boost their avenue
C．reverse a series of losses
D．have their sites visited by the Internet users more
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