单项选择题

A．Their tasty meat.
B．The principle of their defense system against disease.
C．Their solid skin.
D．The principle of their birth modes.
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单项选择题
A．To acquire information from satellites more efficiently.B．To realize full coverage of area the satellite passes overC．To build more ground observation centers.D．To compare satellite information with those from ground.
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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