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
South of the lake country is a broad though shallow valley.
A．Y
B．N
C．NG
单项选择题
A．Picture taking.B．Memory.C．Language learning.D．Poem writing.
A．Picture taking.
B．Memory.
C．Language learning.
D．Poem writing.
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