单项选择题

A．It’’s 50 dollars.
B．It’’s 100 dollars.
C．It’’s 200 dollars.
D．The conversation didn’’t tell us.
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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 ground.
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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