单项选择题

A．To estimate the extreme weather.
B．To develop the satellite technology.
C．To improve agricultural output.
D．To learn how to change information to maps more efficiently.
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单项选择题
A．He was returning home from a party.B．He just got off work when he saw the UFO.C．He was driving home from a restaurant.D．He was coming home from a police station.
A．He was returning home from a party.
B．He just got off work when he saw the UFO.
C．He was driving home from a restaurant.
D．He was coming home from a police station.
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