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163.
M: How much is the note book?
W: Three yuan for one, five yuan for two and seven yuan for three.
M: Then. I'll take three.
答案解析：
正确答案为C。根据seven yuan for three 七元钱三个，可知，男子应付七元钱，因此C项正确。
164.
W: The red cap is $15 and the black one is $12. What color do you want?
M: Oh, I want that large yellow one. How much is it?
W: It's twice as much as the black one.
答案解析：
正确答案为C。根据the black one is $12.黑色的帽子12美元。the yellow one is twice as much as the black one.黄色帽子的价格是黑色的两倍。可知，黄色帽子24美元，因此C项正确。
