单项选择题

What are the two speakers talking about

A. Using the left hand.
B. Operating machines.
C. Designing machines.
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单项选择题
What’s the relationship between the man and the woman
A. They are professor and student.
B. They are friends.
C. They are mother and son.
单项选择题
How is the man getting to work
A. By riding.
B. By bus.
C. By driving.
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