单项选择题

A．Funny.
B．Clever.
C．Brave.
D．Stupid.
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单项选择题
A．Enough food for a week.B．A sleeping bag and a raincoat.C．Hiking boots and bathing suit.D．A camping tent.
A．Enough food for a week.
B．A sleeping bag and a raincoat.
C．Hiking boots and bathing suit.
D．A camping tent.
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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