单项选择题


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 does the man need from the library

A.A research study written by his professor.
B.Demographic information about people living in Europe.
C.Information on research methods in demographics.
D.A specific geography reference book.