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.
单项选择题
We learn from the first paragraph that____.
A．offering senior citizens discounts has become routine commercial practice
B．senior citizen discounts have enabled many old people to live a decent life
C．giving senior citizens discounts has boosted the market for the elderly
D．senior citizens have to show their birth certificates to get a discount
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