单项选择题

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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. The Farmer and the Apple Tree. B. How to Plant an Apple Tree. C. A Friend’s Gift. D. An Apple Tree.
A. The Farmer and the Apple Tree.
B. How to Plant an Apple Tree.
C. A Friend’s Gift.
D. An Apple Tree.
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