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Teaching difficult point:
The pupils can retell the dialogue well.
The pupils can say the great inventions in the world.
Teaching methods：
自主探究法、CAI
学情分析：
五年级学生是小学阶段的高年级，他们已经有了二年英语学习经历，他们能够在教师的指导下自主学习，需要培养学生的阅读能力和综合运用语言的能力。
Teaching steps:
Ⅰ.Pre-task preparation
1.Guessing
Hello，I'm changeable.
Sometimes I'm a newspaper.
Sometimes I'm a book.
Sometimes you can write with me.
Sometimes you can draw with me.
2.Lead in
1.Show the paper and learn it.
2.Saying paper is useful.
3.Show the sentence“I think paper is a great invention”
4.Show the topic Great inventions
5.Answer the questions
What great inventions do you know?
6.Guess the riddles.
Ⅱ.While-task
What does kitty think?
I think paper is a great invention.
People can write on it
2.What does Alice think?
I think the watch is a great invention.
People can tell the time anywhere.