单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Two hours.
B．Three hours.
C．Four hours.
D．Five hours.
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单项选择题
A．Not all Americans can afford traveling in space.B．Not all Americans think it a good idea to go into space.C．Most Americans regard space tourism ridiculous.D．Rich Americans are willing to pay a lot to fly into space.
A．Not all Americans can afford traveling in space.
B．Not all Americans think it a good idea to go into space.
C．Most Americans regard space tourism ridiculous.
D．Rich Americans are willing to pay a lot to fly into space.
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