单项选择题

Questions 9 to 12 are based on the conversation you have just heard.

A. It’s cleaner. B. It’s heavier.
C. It’s warmer. D. It moves more slowly.

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单项选择题

单项选择题

A. He created kite-flying.B. He established a government service.C. He developed a new road.D. He established the postal system.

A. He created kite-flying.
B. He established a government service.
C. He developed a new road.
D. He established the postal system.

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