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．Going after a mouse.B．Always using voices.C．Purring when they are happy.D．Arching their backs when they are afraid.
A．Going after a mouse.
B．Always using voices.
C．Purring when they are happy.
D．Arching their backs when they are afraid.
单项选择题
A．They led to the discovery of America.B．They made American native foods popular.C．They brought great wealth to Spain.D．They made native American life styles well known.
A．They led to the discovery of America.
B．They made American native foods popular.
C．They brought great wealth to Spain.
D．They made native American life styles well known.
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