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173.
M: Waiter, can I have the bill, please?
W: 26.5 yuan, sir.
M: Here are three tens. Keep the change.
W: Thank you. Have a nice day!
答案解析：
正确答案为C。顾客给了three tens，3张10元，而账单为26.5元，顾客说服务员不用找零，可知女子有3.5元的小费，因此C项正确。
174.
M: I suppose your second-hand TV set cost about $ 60.
W: Sixty? Actually it was double that price.
答案解析：
正确答案为B。根据I suppose your second-hand TV set cost about $ 60.我想你的二手电视机花了60美元；和女子说Actually it was double that price.是那价钱的两倍。60美元的两倍，也就是120美元，因此B项正确。
