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单项选择题

You must book your Saver return ticket __________ days in advance.

A．8
B．7
C．31
D．50

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单项选择题The Saver return ticket is NOT valid for

A．Saturdays.
B．Sundays.
C．any public holidays.
D．certain peak trains.

单项选择题What is the writer's main message in the passage

A．Unemployment brings downward changes in people's lives.
B．One should try to make the best of unemployment.
C．Unemployment results in negative psychological effects.
D．Many people have no problems with unemployment.