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．20 miles.B．6 miles.C．14 miles.D．26 miles.
A．20 miles.
B．6 miles.
C．14 miles.
D．26 miles.
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.
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