单项选择题

A．Try to change his reservations.
B．Travel by train instead of by plane.
C．Continue trying to get a ticket.
D．Cancel his December travel plans.
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单项选择题
What do we learn about the current U.S. intercity railroads from the passage
A．It is already a high-speed rail system.
B．It attracts a lot of fund for improvement.
C．It covers a long way nationwide.
D．It lags far behind other developed nations.
单项选择题
What will be deeply influenced by the changing temperatures
A．Sea and river levels.
B．Plants and animals.
C．People’s health.
D．People’s living style.
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