单项选择题


Questions 5 to 7 are based on the following conversation, At the end of the conversation, you will be given 15 seconds to answer the questions.
Now listen to the conversation.
What can be inferred from the conversation about the man and his roommate

A.He is surprised at his discovery.
B.They have had these problems for a long time.
C.They are beginning to have problems.
D.They come from different countries.