单项选择题

A. Birds use their beaks to clean their feathers.
B. Preening is very important to birds.
C. The habits of birds are interesting.
D. How birds clean their feathers.
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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. 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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