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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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单项选择题
A．Because it would help decrease traffic accidents.B．Because it was a Swedish custom.C．Because it was always very dark in Sweden.D．Because it was always cloudy and rainy in Sweden.
A．Because it would help decrease traffic accidents.
B．Because it was a Swedish custom.
C．Because it was always very dark in Sweden.
D．Because it was always cloudy and rainy in Sweden.
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