单项选择题

Which of the following is the best title for the passage

A．Take Vacations in Space
B．Building Hotels in Space
C．Flight regulations in Space Travels
D．Cost of Space Traveling
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单项选择题
How much is the 2 - hour space tour for each person according to Space Adventures in Arlington
A．$1 million
B．$ 10,000
C．$98,000
D．$ 22,000
单项选择题
The phrase bread- and- butter business most probably means ______.
A．a business to sell bread and butter
B．a business to produce bread and butter
C．the business to make a living
D．a traveling agency
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