单项选择题

Now, the most effective form of advertising is ______.

A．a 30-second prime-time TV ad
B．a 30-second prime-time online advertising
C．online advertising
D．most expensive TV ad
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单项选择题
Why do advertisers like the new auction based service for display advertising
A．Because more people can see the advertisement.
B．Because the service brings them more profit.
C．Because they only pay for results.
D．Because the service offer more flexibility and control.
单项选择题
What's the main idea of the passage
A．Online advertising is more effective than TV advertising.
B．Google and Yahoo! are challenging Microsoft in the field of advertising.
C．Google's new advertising service could make the internet an even more valuable marketing medium.
D．Online advertising is popular with advertisers.
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