单项选择题

A．One week.
B．One month.
C．Two days.
D．Three days.
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单项选择题
A．Neither of the two types of rockets is very economical.B．The liquid-fuel rocket is best.C．Each type of rocket has certain advantages.D．The solid-fuel rocket is best.
A．Neither of the two types of rockets is very economical.
B．The liquid-fuel rocket is best.
C．Each type of rocket has certain advantages.
D．The solid-fuel rocket is best.
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.
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