Lesson17 Save the Tigers
Teaching Aims教学目标
1.Key and important points（重难点）:  Words:courage, brave, reason  Phrases:at the beginning of , drop to, in danger  Sentences:①At the beginning of the 20th century, the number of   tigers in the wild was around 100 000.  ②In recent years, tigers have been in danger of disappearing.2.Grammer(语法): the number of ...3.Emotion aim（情感目标）: How to protect animals.
New words and phrases
century世纪            at the beginning of 在...之初courage勇气，胆量       drop to 下降 ...