单项选择题

According to the passage, ______is the key factor to making "Nowcasts" a reality.

A．scientific and technological advances such as radar, or satellites
B．computer scientist
C．meteorologists
D．advanced computer programs
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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 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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