单项选择题

Passage One
Questions 26 to 29 are based on the passage you have just heard.

A．Its chemical elements must be studied.
B．Its temperature must be lowered.
C．Big spaceships must be built.
D．Its atmosphere must be changed.
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单项选择题
A．Nineteenth-century sea captains.B．The development of the steamship.C．The economic importance of sailing ships.D．Employment in the fishing and whaling industries.
A．Nineteenth-century sea captains.
B．The development of the steamship.
C．The economic importance of sailing ships.
D．Employment in the fishing and whaling industries.
单项选择题
A．She hasn’t called the travel agency yet.B．The man may have to reschedule his trip.C．She doesn’t know when her semester ends.D．The man should take his vacation somewhere else.
A．She hasn’t called the travel agency yet.
B．The man may have to reschedule his trip.
C．She doesn’t know when her semester ends.
D．The man should take his vacation somewhere else.
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