Unit 6 When was it invented?重点短语:1.look up to 钦佩;仰慕 2. encourage sb. to do 鼓励某人做…… 3. without doubt 毫无疑问；的确 4. shoes with special heels 有特殊鞋跟的鞋子 5. shoes with lights 有灯的鞋子 6. the style of the shoes 鞋子的样式 7. 8. my pleasure 乐意效劳 8. think of 想出 think about 考虑;思考 9. have a point 说得有理 10. in our daily lives 在我们的日常生活中 11. at that time 在那时 12. spread to... 传播到……13. by accident 偶然;意外地 14.. it is said that... 据说…… 15. over an open fire在篝火上 16. fall into /drop into掉入 17. be used for doing sth. / be used to do sth. 被用来做…… 18. not.. until 直到……才 19. in less than 100 years 在不到100年的时间里 20. take place 发生 21. even though 即使 22. at a low price 以低的价格 23. steal sth. from 从……偷东西 24. advise sb. (not) to do sth 建议某人（不）做某事25. by mistake 无意中 26. on a hard floor 在坚硬的地板上 27. divide... into 把......分成 28. stop... from doing sth. 阻止……做某事 29. the number of... ……的数量 30. translate... into 把……翻译成 30. 31. all of a sudden=suddenly 突然重点句子：1. It is said that a Chinese ruler called Shen Nong was the first to discover tea as a drink. 据说，有一位叫神农的中国统治者最早发现了茶可以饮用。
2. One of the world’s favorite drinks was invented by accident. 世界上最受欢迎的饮料之一是偶然被发明的3. Potato chips were invented by mistake. 薯条是无意中被发明的4. The tea trade from China to West country took place in the 19th century. 中国和西方国家之间的茶叶贸易发生在19世纪5. Our parents advised us not to go out alone. 我们的父母劝我们不要独自外出6. At the same time, they need to stop the competing team form getting the ball into their own basket. 同时，他们需要阻止对方的球队抢到球投进它们自己的篮里。
7. The earthquake happened all of a sudden, but luckily the villagers were brought to a safe place. 突然发生了地震，但幸运的是，村民们被带到了一个安全的地方8. Basketball has not only become a popular sports to play, but it has also become a popular sport to watch. 篮球不仅成为了一项人们能参与的受欢迎的运动，也成为一项人们喜欢观看的运动9. The number of foreign players, including Chinese players, in the NBA has increased. NBA中包括中国球员在内的外国球员数量有所增加10. Many young people look up to these basketball heroes and want to become like them. 许多年轻人崇拜这些篮球英雄，并且想成为像他们那样的人。
11. These stars encourage young people to work hard to achieve their dream. 这些明星激励着年轻人为了实现他们的梦想而努力奋斗。