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Lesson 17: Save the Tigers,1) the number of 2) balance的用法 3) danger的用法,I. Learning aims:,Master the new words: century, fur, symbol, courage, brave, chain, balance, reason, disappear, kill, cut, decrease,II. Learning important and difficult points:,New Words,century fur symbol courage brave chain balance reason disappear kill cut decrease,Think About It,Where can you usually see a tiger? Do you think tigers need our help? Why or why not?,Language Points,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。 the number of是固定短语，意为“的数量”，后接可数名词复数，但中心词是number，所以谓语动词要用单数。如： The number of students in our school has grown from 1,000 to more than 1,500. a number of为量词短语，意为“许多；大量”，相当于a lot of或lots of，中心词是该短语所修饰的可数名词复数，所以作主语时，谓语动词用复数形式。 如： A number of students like playing computer games.,2. It helps keep the number of other wild animals in balance. 它可以帮助保持其他野生动物的数量平衡。 balance 在句中用作名词，意为“平衡；均衡”，常用短语be out of balance，意为“不平衡”；keep in balance意为“保持平衡”；balance还作动词，表示“（使）平衡；（使）均衡”。如： You must learn to keep your balance in skating. 在滑冰时你必须要学会保持平衡。,3. In recent years, tigers have been in danger of disappearing. 近年来，老虎已经面临消失的危险。 danger意为“危险”，通常是不可数名词，表示做某事的危险或发生某情况的危险等，常用短语 be in danger (of)，意为“在危险中”。如： Is there any danger of fire? 有发生火灾的的危险吗？,Exercises,1. _ (长颈鹿) are the tallest animals on land. 2. What beautiful _ (婚礼) clothes they are! 3. Uncle Yan visited many _ (亚洲的) countries last year. 4. He is interested in _ (历史).,history,I. 根据句意及所给汉语提示，完成下列句子。,Giraffes,wedding,Asian,1. One of the worlds biggest zoos _ (be) in Egypt. 2. My pet dog _ (die) two weeks ago. 3. _ (bar) keep the animals inside. 4. They got _ (marry) on August, 8th 2008. 5. The Siberian tiger is the _ (big) cat (猫科动物) in the world.,biggest,II. 用所给单词的适当形式填空。,is,died,Bars,married,1. Nobody else wants to go to the village. (改为同义句) _ _ _ want to go to the village. 2. Liu Yang kept two dogs. (改为否定句) Liu Yang _ _ two dogs. 3. Those zoos have ten pandas. (改为同义句) _ _ ten pandas in those zoos.,There are,III. 句型转换，每空一词。,No other people,didnt keep,Homework,Work in groups and discuss some ways we can protect animals. Write down your ideas.,同学们,来学校和回家的路上要注意安全,同学们,来学校和回家的路上要注意安全,
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