题目：
选择正确的答语。
( ) 1. Where is Danny?
( ) 2. What is Mr. Wood doing?
( ) 3. Where are Li Ming and Jenny?
( ) 4. How many books do you have?
( ) 5. Whose apple is it?
A. He is writing with the chalk.
B. I have eight books.
C. He is in the library.
D. They are in the classroom.
E. It is her apple.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
时，接触的牙体是（）