单项选择题

A．Soil.
B．Human population.
C．Forest.
D．Water.
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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.
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.
单项选择题
A．Weights and measurements.B．Political systems.C．Employment.D．Money.
A．Weights and measurements.
B．Political systems.
C．Employment.
D．Money.
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