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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.
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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.

单项选择题A．He was very slow in doing things.B．He was the right person to do such a thing.C．He is expected to do such a thing.D．He would never do such a thing.

A．He was very slow in doing things.
B．He was the right person to do such a thing.
C．He is expected to do such a thing.
D．He would never do such a thing.