单项选择题

Passage Two
Questions 30 to 32 are based on the passage you have just heard.

A．They were protected by a strong United States Navy.
B．They were supported by a well-developed railroad.
C．Most crew members had experience on foreign ships.
D．As part owners of the ships, captains got some of the profits.
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单项选择题
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.
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.
单项选择题
A．To show how politics have changed over the years.B．To point out that T-shirts often provide personal information.C．To illustrate how the printing on clothing has improved.D．To support that T-shirts are a form of art.
A．To show how politics have changed over the years.
B．To point out that T-shirts often provide personal information.
C．To illustrate how the printing on clothing has improved.
D．To support that T-shirts are a form of art.
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