Unit 3 Animals are our friendsLesson 17 Save the tigers Where can you usually see a tiger? Do you think tigers need our help? Why or why not?There are currently six types of tigers: the Bengal tiger, the Siberian tiger, the Sumatran tiger, the Malayan tiger, the Indochinese tiger the South China tiger.the Bengal tigerthe Siberian tigerthe Sumatran tigerthe Malayan tigerthe Indochinese tigerthe South China tigercenturyfursymbolcouragebravechainn. 世纪世纪n. （兽类的）毛（兽类的）毛n. 标志，象征标志，象征n. 勇气，胆量勇气，胆量adj. 勇敢的，无畏的勇敢的，无畏的n. 链子；链条链子；链条Words and expressionsbalancereasondisappearkillcutdecreasen. 平衡，平稳平衡，平稳n. 原因，动机，理由原因，动机，理由v. 消失，失踪消失，失踪v. 杀死杀死v. 砍，切，剪，割砍，切，剪，割v. 使使变小；减少变小；减少Words and expressionsTo 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 wellobjectivesRead 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.