单项选择题

A．To acquire information from satellites more efficiently.
B．To realize full coverage of area the satellite passes over
C．To build more ground observation centers.
D．To compare satellite information with those from ground.
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单项选择题
A．Bone structure.B．Smell ability.C．Birth mode.D．Recovery ability against disease.
A．Bone structure.
B．Smell ability.
C．Birth mode.
D．Recovery ability against disease.
单项选择题
A．By fuming them farming.B．By affecting the quality of soil.C．By adding chemicals and polluting the waterways.D．By affecting the environments they live in.
A．By fuming them farming.
B．By affecting the quality of soil.
C．By adding chemicals and polluting the waterways.
D．By affecting the environments they live in.
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