单项选择题

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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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
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
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