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

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