单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．To find out how specialized bone ceils have evolved.
B．To understand differences between bone tissue and other tissue.
C．To learn how to prevent a bone disease.
D．To create artificial bone tissue.
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单项选择题
A．He turned things upside down.B．He drank the beer.C．He chased the people away.D．He ate the honey.
A．He turned things upside down.
B．He drank the beer.
C．He chased the people away.
D．He ate the honey.
单项选择题
A．They have difficulty identifying these cells.B．They’ve found similar cells in other species.C．They’ve learned how to reproduce these cells.D．They aren’t sure how these cells work.
A．They have difficulty identifying these cells.
B．They’ve found similar cells in other species.
C．They’ve learned how to reproduce these cells.
D．They aren’t sure how these cells work.
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