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.
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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
The directors of the museums have realized ______.
A.the scientific rules are important
B.people learn best when they look at something
C.visitors prefer to learn from museums
D.people become more interested if they take part in
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