Unit 6 When was it invented?
Section A(1a－2d)
1．重点单词：heel，scoop，electricity，style，project，pleasure，zipper，daily，website，pioneer，list，mention
2．重点短语：be used for，think of，have a point
3．重点句式：—When was the telephone invented?
—I think it was invented in 1876.
What are they used for?
Can you help me think of an invention?
Is it really such a great invention?
Think about how often it's used in our daily lives.
The pioneers of different inventions were listed there.
At that time，it wasn't used widely.
