单项选择题

A．She doesn’t like picnic.
B．It will be too hot.
C．She will have an exam next week.
D．The biology class will go to the beach next week.
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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.
A．Their tasty meat.
B．The principle of their defense system against disease.
C．Their solid skin.
D．The principle of their birth modes.
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 groun
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 groun
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