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 ground.
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单项选择题
A．She will help him.B．She finished hers two days ago.C．She completed her work very quickly.D．She is still doing the project.
A．She will help him.
B．She finished hers two days ago.
C．She completed her work very quickly.
D．She is still doing the project.
单项选择题
A．By good sense of water waves made by quarries.B．By good sense of smell and electrical and magnetic power.C．By good sense of light.D．By good sense of blood.
A．By good sense of water waves made by quarries.
B．By good sense of smell and electrical and magnetic power.
C．By good sense of light.
D．By good sense of blood.
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