单项选择题

A．He lost a button at work.
B．He doesn’t know where he put the calculator.
C．He thinks he broke something the woman lent him.
D．He’s not sure how to solve the math problem.
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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．She prefers the job where he could travel a lot.B．She prefers the job where she could make good money.C．She prefers the job where she could meet international business people.D．She prefers the job that would give her lots of chances of promotion.
A．She prefers the job where he could travel a lot.
B．She prefers the job where she could make good money.
C．She prefers the job where she could meet international business people.
D．She prefers the job that would give her lots of chances of promotion.
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