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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：
正确答案为C。根据 I'm 39 and he is 4 years younger.我39岁，他比我小四岁。可知，迪克今年35岁，因此C项正确。
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：
正确答案为A。根据we had twenty-five from the Middle East and fifteen from Latin America.有25名来自中东的学生，和15名来自拉美的学生参加考试。可知，共有40名学生参加了上周六的考试，因此A项正确。
