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.
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填空题
motivations
单项选择题
A. To fly through the water looking for explorers.B. To show TV programs and films to experimental workers at sea.C. To demonstrate technology for the development of another vehicle of its kind.D. To transport explorers to the very bottom of the sea.
A. To fly through the water looking for explorers.
B. To show TV programs and films to experimental workers at sea.
C. To demonstrate technology for the development of another vehicle of its kind.
D. To transport explorers to the very bottom of the sea.
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