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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 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 has little interests in this project.
D．The first passenger countdowns are within a few years.

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