单项选择题

Twenty-five years ago the number of the museums in the United States and Canada was only about ______.

A．3,500
B．2,000
C．3,000
D．6,000
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单项选择题
Why has the growing population of young people caused the changes in museums
A．Because they are wealthy.
B．Because they are stronger.
C．Because they have more spare time.
D．Because they are better educated.
单项选择题
A bag of wheat was enough for ______.
A．19 squares
B．one third of the squares
C．the first 19 squares
D．20 squares
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