单项选择题

The word "exceeded" in paragraph 1 most probably means ______.

A．added up to
B．were more than
C．were about
D．were less than
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单项选择题
According to the author, the passage mainly deals with ______.
A．a tornado in Edmonton, Alberta
B．what's a "Now casts"
C．the disadvantage of conventional computer models of the weather fore- cast
D．a breakthrough in weather forecast
单项选择题
Conventional computer models of the atmosphere fails to predict such a short- lived tornado because ______.
A．the computer is not used to forecast specific local events
B．the computers are not advanced enough to predict it
C．the weather data people collect are often wrong.
D．weather conditions in some small regions are not available
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