单项选择题

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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.
单项选择题
A. It is a kind of airplane.B. It is a one-person underwater vehicle.C. It is a one-person vehicle on the sea.D. It is a warship.
A. It is a kind of airplane.
B. It is a one-person underwater vehicle.
C. It is a one-person vehicle on the sea.
D. It is a warship.
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