单项选择题

The main idea of the second paragraph is ______.

A．people's attitude towards Wikipedia is controversial
B．Wikipedia is spread worldwide
C．Wikipedia is a symbol of collaboration and cooperation
D．it is not quite a reliable resource

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单项选择题

According to Philip Bradley, Wikipedia is not authoritative because ______.

A．it is not printed and published
B．nobody has to rely on it for a livelihood
C．the data is not reliable as nobody has to ensure that
D．it all comes out of the window

单项选择题

Wikipedia is different from the traditional encyclopedias in that ______.

A．it started with an insane idea
B．it has no full-time staff at all
C．it is a resource that one must use with caution
D．it has the largest number of entries