单项选择题

Science museums encourage visitors to touch, listen, and operate in order to______.

A．find out scientific roles for themselves
B．make them feel relaxed
C．make them interested in science
D．all of the above
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单项选择题
According to the passage, one rule of bungee jumping is that you______.
A．must have a rope tied to your ankles
B．must jump from tall buildings
C．should jump above the sea
D．should keep yourself safe
单项选择题
In the new century the WTO will ______.
A．make complete new roles in every area of International trade
B．have more members and settle more problems
C．take the place of the World Bank and the International Monetary Fund
D．have new roles covering trade in services and intellectual property
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