单项选择题

A．Soil.
B．Human population.
C．Forest.
D．Water.
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单项选择题
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
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
单项选择题
A．4 weeks.B．6 weeks.C．8 weeks.D．10 weeks.
A．4 weeks.
B．6 weeks.
C．8 weeks.
D．10 weeks.
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