【正文】
s) Headwork (動(dòng)腦筋 ) How old are they? Tom, Tim, Mary and Ann are brothers and sisters. I don‘t know how old each of them(他們中的每一個(gè)) is. I only know, one is 18, and one is 15. One of( ...其中之一) the boys is 16, and one of the girls is 17. I also know, Tom is older than(比 ...年齡大) Mary, but Ann isn’t. Answer the questions: 1. How old is Ann? 2. How old is Tom? 3. How old is Tim? 4. How old is Mary? (答案: 1. Ann is 15. 2. Tom is 18. 3. Tim is 16. 4. Mary is 17.)