What is the purpose of the man's talk？
A. Encouraging people to ask questions.
B. Giving an introduction to his speech.
C. Discussing problems in learning.
【B15】
A. some
B. each
C. one
D. none
【B19】
A. doctor
B. husband
C. friend
D. neighbor
Can the man buy the shoes？
A. Yes, at the lower price.
B. Yes, but not at a lower price.
C. No, they are not for sale.
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