单项选择题

A．It’’s too late to find a tutor.
B．The man shouldn’’t hire the same tutor that she had.
C．She isn’’t prepared for the midterm exam either.
D．The man should hire a tutor before the midterm exam.
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单项选择题
In the first paragraph, the author draws an analogy between ________.
A．doing research and drawing a picture
B．research finding and picture’’s perspective
C．designing a research and making a quick drawing
D．a researcher and a painter
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.
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