单项选择题

A．It uses nuclear energy.
B．It rests on a cushion of professional air.
C．It flies over magnetically activated tracks.
D．It uses a device similar to a jet engine.
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单项选择题
A．To learn how to prevent a bone disease.B．To understand differences between bone tissue and other tissue.C．To find out how specialized bone cells have evolved.D．To create artificial bone tissue.
A．To learn how to prevent a bone disease.
B．To understand differences between bone tissue and other tissue.
C．To find out how specialized bone cells have evolved.
D．To create artificial bone tissue.
单项选择题
A．A stormy ocean.B．Calm water.C．Golden sand.D．Little waves.
A．A stormy ocean.
B．Calm water.
C．Golden sand.
D．Little waves.
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