单项选择题

What is the future work planned to do

A．Acquire information from satellites more efficiently.
B．To realize full coverage of area the satellite passes over.
C．Building more ground observation centers.
D．Compare satellites information with those from groun

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单项选择题

Why American scientists are developing these maps

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

Which is not mentioned in the passage as an aspect that farming activities are damaging

A．Soil.
B．Human population.
C．Forest.
D．Water.