单项选择题

According to the author, the passage mainly deals with______.

A．a tornado in Edmonton, Alberta
B．what' s a "Nowcast"
C．the disadvantage of conventional computer models of the weather forecast
D．a breakthrough in weather forecast

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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

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