Questions 7 to 10 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.
At what age did Kerron Clement move to the United States

A．By contrasting various periods in American history.
B．By classifying various types of colonies.
C．By describing developments leading to the American revolution.
D．By outlining steps in the development of royal colonies.

A．It’s too crowded.
B．There are not enough study places.
C．It’s too far away.
D．There are not so many books as the old library.