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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.

单项选择题A．To see films.B．To read books in the library.C．To attend lectures.D．To visit the Association.

A．To see films.
B．To read books in the library.
C．To attend lectures.
D．To visit the Association.

单项选择题A．Because she was a black girl.B．Because she got the highest average in the class.C．Because she wanted to hit the chairman’s wife.D．Because she refused to retake the exam.

A．Because she was a black girl.
B．Because she got the highest average in the class.
C．Because she wanted to hit the chairman’s wife.
D．Because she refused to retake the exam.

单项选择题A．They have difficulty identifying these ceils.B．They aren’t sure how these cells work.C．They’ve learned how to reproduce these cells.D．They’ve found similar cells in other species.

A．They have difficulty identifying these ceils.
B．They aren’t sure how these cells work.
C．They’ve learned how to reproduce these cells.
D．They’ve found similar cells in other species.