171.
W: Are you traveling alone?
M: No, I will take my family abroad this time. My wife and our three children are all going along with me.
W: What a wonderful experience that will be! I wish I could travel abroad some day.
答案解析：
正確答案為C。根據(jù)My wife and our three children are all going along with me.我妻子和我們的三個孩子都跟我一起去。可知，共有四人跟男子一起去旅行，因此B項正確。

172.
M: I thought that the chair cost 50 dollars.
W: It used to, but the price has gone up 15 dollars.
M: Well, that's more than I can afford, I'm afraid.
答案解析：
正確答案為C。椅子原價50美元，現(xiàn)在the price has gone up 15 dollars價格上漲了15美元，所以現(xiàn)在椅子的價格為65美元，因此C項正確。