第二节：听对话，选答案。听下面4段对话，并根据所提的问题，从A、B、C三个选项中选出最佳答案。每段对话读两遍。（共10小题，每题1分，计10分）
听第六段材料，完成6、7小题。
6. Who will give them a talk?
A. A famous teacher. B. A famous writer. C. A famous inventor.
7. Where will the y listen to the talk?
A. In the 1st meeting hall. B. In the 2nd meeting hall. C. In the 3rd meeting hall.
