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.
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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.
单项选择题
A．The raid had been photographed by hidden cameras.B．Some watchman had seen the raid.C．The bank teller proved that Joe was the robber.D．Some monitors had been installed nearby.
A．The raid had been photographed by hidden cameras.
B．Some watchman had seen the raid.
C．The bank teller proved that Joe was the robber.
D．Some monitors had been installed nearby.
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