Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now, listen to the conversation.
What is the woman’s tone of voice when the first sees the man

A．He gives an example and then defines it.
B．He explains the root and prefix of the word.
C．He gives an example after defining it.
D．He shows the woman a list.

A．To find out if he is teaching Chemistry 221.
B．To find out if she can take a class.
C．To find out the prerequisites for his class.
D．To find out how many students are in the class.