题目内容

听下面一段材料,回答第1-3题。
1. What is the speaker probably doing?
A. Making an introduction.
B. Giving a business talk.
C. Giving a lesson.
2. What do we know about Professor Robert Barnes?
A. He is a famous doctor.
B. He is well-known for his book.
C He works in the University of Columbia.
3. When will the professor answer questions?
A. At the beginning of his talk.
B. During his talk.
C. At the end of his talk.
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