单项选择题

How many children's museums have been set up in America in the past 15 years

A．About 100.
B．Over 180.
C．Less than 80.
D．Altogether 215.
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单项选择题
Which of the following is aimed at the restriction of smoking according to the passage
A．Closing down large numbers of cigarette factories.
B．Rewording those who never smoke.
C．Encouraging export of cigarettes.
D．Putting health warnings on cigarette packages.
单项选择题
In children's museums school pupils can ______.
A．have a chance to do field study
B．broaden their horizons in different ways
C．experience things in an interesting way
D．form groups to discuss different topics
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