单项选择题

A．Putting a roof on a barn.
B．Harvesting water reeds.
C．Using stone as a building material.
D．Daily farm operations.
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单项选择题
A．People never analyze the problem they meet.B．People often accept the opinions or ideas of other people.C．People may learn from their past experience.D．People can not solve some problems they meet.
A．People never analyze the problem they meet.
B．People often accept the opinions or ideas of other people.
C．People may learn from their past experience.
D．People can not solve some problems they meet.
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