L17_Save_the_Tigers - 副本.ppt

* Lesson 17 Save the Tigers century fur symbol courage brave chain n. 世纪 n. （兽类的）毛 n. 标志，象征 n. 勇气，胆量 adj. 勇敢的，无畏的 n. 链子；链条 Words and expressions balance reason disappear kill cut decrease n. 平衡，平稳 n. 原因，动机，理由 v. 消失，失踪 v. 杀死 v. 砍，切，剪，割 v. 使……变小；减少 Words and expressions To use the following words and expressions correctly: century, courage, brave, reason, kill, cut, at the beginning of…, drop to, food chain, in balance, in danger, cut down, as well objectives Where can you usually see a tiger? Do you think tigers need our help? Why or why not? See the video of a public-service advertisement. See the video of a report. There are currently six types of tigers: the Bengal tiger, the Siberian tiger, the Sumatran tiger, the Malayan tiger, the Indochinese tiger and the South China tiger. the Bengal tiger the Siberian tiger the Sumatran tiger the Malayan tiger the Indochinese tiger the South China tiger Read the lesson and answer the questions. 1. How many tigers were there at the beginning of the 20th century? Around 100 000. 2. How many tigers are there in the wild today? The number has dropped to a few thousand. 3. Where do tigers live? They live in the forests of Asia. 4. What do tigers look like? They usually have orange fur and dark stripes. 5. What do tigers symbolize? They are symbols of strength and courage. 6. How are tigers described in many stories? They are brave. 7. What does “at the top of the food chain” mean? Tigers are the king of all the wild animals. 8. What is the reason tigers are important to the environment? Because tigers help keep the number of other wild animals in balance. 9. Why do people hunt and kill tigers? They are for money. 10. Aside from their being hunted and killed, what is another reason tigers are disappearing? People have cut down a lot of trees as well. As forests disappear, tigers lose the homes. 1. At the beginning of the 20th century, the number of tigers in the wild was around 100 000. 在二十世纪初期，野生老虎的数量大约是十万