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【导学过程】
导入：复习检查上节内容。Ask the question :Have you ever seen tigers?
认知学习目标（见课件）
出示学习目标，用1分钟时间让学生齐读学习目标。教师对教学目标进行要点梳理、重点强调和具体要求。
预习成果展示
1.strong(名词)__________ 2.balance(形容词)___________
3.drop(过去式)___________ 4.下降到，跌至___________
5.食物链_____________ 6.保持平衡_______________
7.…..的数量________________ 8.as well__________
9.in danger________________ 10.cut down____________
11. at the top of…____________ 12. be important to_________
13. in recent years_______________ 14.在…之初________________
三、课堂学习研讨
Activity1.Read the lesson and answer the questions.
Activity2.Language points
1.At the beginning of the 20th century, the number of tigers in the wild was around 100 000.
at the beginning of 在......之初，the 20th century二十世纪，表达“在......纪”要用介词in。
We live_____________________ (在21世纪.)
the number of......的数量,后接可数名词复数,但做主语时,谓语动词用单数。
拓展:a number of许多,后接可数名词复数,做主语时,谓语动词用复数。
1)The number of the students in our school ____(be) 3000.
2)A number of people ____(speak)English in the world.
2. For this reason, tigers are important to the environment.
因为这个原因，老虎对环境很重要。
be important to sb./sth. ……对……来说是重要的。
be important for sb./sth. 对于……来说做……是重要的。
例如:
Time is important to me.
It is important for you to get there early.
3. In recent years, tigers have been in danger of disappearing.