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
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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
单项选择题
According to the passage, the word Now casts ( paragraph 3 ) means ______.
A．a way of collecting raw weather data
B．a forecast which can predict the weather conditions in the small area in an accurate way
C．a network to collect instant weather data
D．a more advanced system of weather observation
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