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．At class.B．Back at home.C．At work.D．In hospital.
A．At class.
B．Back at home.
C．At work.
D．In hospital.
单项选择题
A．Red.B．Black.C．White.D．Not all of the abov
A．Red.
B．Black.
C．White.
D．Not all of the abov
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