题目内容：
A The purpose is not only to provide fun but also to help people feel at home in the world of science.
B Museums have changed.
C In one room, for instance, you may find materials, clothing, tools, cooking pots,
Furniture， and art works of a particular place and time.
D Instead of being places that one "should" visit, they are places to enjoy.
E There are open spaces that museums leave for visitors.
F Many museums have changed in appearance.
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