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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What's the author's tone in the last sentence of the passage
A．objective
B．ironical
C．approving
D．enthusiastic
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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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