单项选择题

A．A snowstorm.
B．An earthquake.
C．A traffic accident.
D．A hurrican
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单项选择题
A．Life was easy and food was easy to find.B．People care more about how to survive.C．The people took care of each other out of love.D．There are many developed individual monetary systems.
A．Life was easy and food was easy to find.
B．People care more about how to survive.
C．The people took care of each other out of love.
D．There are many developed individual monetary systems.
单项选择题
A．The rocket should be inexpensive to construct.B．The rocket is capable of lifting heavy spacecraft into orbit.C．The rocket should be easily controlled.D．The rocket should be inexpensive to operat
A．The rocket should be inexpensive to construct.
B．The rocket is capable of lifting heavy spacecraft into orbit.
C．The rocket should be easily controlled.
D．The rocket should be inexpensive to operat
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