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
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
单项选择题
According to the passage, the word Nowcast ( 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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