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．Order tickets via the Internet.B．Order tickets by going to the box office personally.C．Order tickets by writing a letter.D．Order tickets by calling the box office.
A．Order tickets via the Internet.
B．Order tickets by going to the box office personally.
C．Order tickets by writing a letter.
D．Order tickets by calling the box office.
问答题
According to the author, one man’’s profession or work is often another man’’s ________.
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