单项选择题

Questions 9 to 12 are based on the conversation you have just heard.

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. 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.
单项选择题
A. In Athens. B. In New York. C. In Paris. D. In Moscow.
A. In Athens. B. In New York.
C. In Paris. D. In Moscow.
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