单项选择题

The most important factor in Google's success is ______.

A．its unique mathematical recipe
B．the popularity of its brand among users
C．that it was the first search engine in the world
D．its stock market flotation
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单项选择题
Though it is difficult to remember now, this was not always the case. In the 1st paragragh, this sentence suggests that______.
A．today Google has become a commonplace way to find information online
B．Google made a great contribution to searching online
C．Google changed a lot
D．Google is different from other search engines
单项选择题
But they were less good at presenting those pages, which might number in the hundreds of thousands, in a useful way. This sentence in the 3rd paragraph tells us that ______.
A．other search engines are less convenient in use
B．Google is the best search engine
C．there are too many search engine
D．all the search engines are basically the same
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