单项选择题

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

A. They defend the bone against viruses.
B. They prevent oxygen from entering the bone.
C. They break down bone tissue.
D. They connect the bone to muscle tissue.
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单项选择题
A. Because the class has been assigned to read French books.B. Because he was able to read it in French.C. Because he isn’t sure it’s available in English.D. Because he thinks it’s an example of what the professor wants.
A. Because the class has been assigned to read French books.
B. Because he was able to read it in French.
C. Because he isn’t sure it’s available in English.
D. Because he thinks it’s an example of what the professor wants.
单项选择题
A
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