单项选择题

The author mainly discusses （）of public transportation.

A．the price
B．the types
C．the improvement
D．the advantage

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Each participating team should at least have （）members.

A．two
B．three
C．four
D．five
单项选择题
The passage is mainly about（）

A．loneliness.
B．experience.
C．memory.
D．isolation.
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