【知识梳理】 I. 重点短语1. give up 2. try out 3. most of 4. notany more 5. at the age of 6. at that time 7. send message by telegraph 8. graduate from9. turn down10. put up 11. at the top of12. get together 13. from house to house14. at the end of 15. on top of 16. as well 17. climb down18. in a single night19. even though 20. live on 21. once upon a time22. according to23. keep warm 24. on the other hand 25. on show26. on display27. in the future