题目内容
【B2】
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听力原文：M: You're going to wear out that typewriter.
W: Oh, hi. What are you doing here at this time of night？
M: I should ask you that question. Do you have any idea what time it is？
W: About ten or ten-thirty？
M: It's nearly midnight.
W: Really？ t didn't have any idea it was so late.
M: Don't you have an early class tomorrow morning？
W: Yes, at seven o'clock. My part-time class, for the students who go to work right after their lesson.
M: Then you ought to go to bed.
W: Ok.
When is the conversation taking place？
【B20】
【B19】
综合所得税制采用的纳税方法是()。
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