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
Which of the following is true according to the passage
A．The biggest hurdle for the space - tourism project is lack of a life supporting system.
B．The entrepreneurs trying to explore the space - tourism have plenty of money.
C．The government have little interest in this project.
D．The first passenger countdowns are within a few years.
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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