《When was it invented?》SectionB PPT教学课件(第1课时)

人教版九年级英语上册《When was it invented?》SectionB PPT教学课件(第1课时)，共23页。

Warming-up

A: When was the… invented?

B: It was invented in…

A: Who was it invented by?

B: It was invented by ...

A: What was it used for?

B: It was used for ...

Summary

1. key words & expressions: 

sour, customer, by mistake, in the end

2. Sentence:  

① Potato chips were invented by mistake.

② The customer was happy in the end.

3.Functions: To give students listening and speaking practice.

......

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