177.
M: Do you know how old Dick is this year?
W: Well, let me see. I'm 39 and he is 4 years younger.
答案解析：
正確答案為C。根據(jù) I'm 39 and he is 4 years younger.我39歲，他比我小四歲。可知，迪克今年35歲，因此C項(xiàng)正確。

178.
M: How many students took the exam last Saturday?
W: Well, let me see. I believe that we had twenty-five from the Middle East and fifteen from Latin America.
答案解析：
正確答案為A。根據(jù)we had twenty-five from the Middle East and fifteen from Latin America.有25名來(lái)自中東的學(xué)生，和15名來(lái)自拉美的學(xué)生參加考試。可知，共有40名學(xué)生參加了上周六的考試，因此A項(xiàng)正確。