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Ask Ss the questions:
Do you like eating potato chips?
Which kind of taste do you like?
Do you know how they were invented?Step 3Activity 1c.
Listen and circle T or F.Step 4Listen again and answer some questions.Step 5Activity 1d.
Listen again and then complete the sentences.Step 6Pair works.
Let Ss make conversations about the invention of potato chips.
E.g.:
A: Did you know potato chips were invented by mistake?
B: Wow, I didn’t know that. Who invented them?
A: ... Step 7Brainstorm.
Introduce to Ss how some food was invented, like sandwich, post-it notes, and corn flakes.Step 8Free talk.
Ask Ss to talk about other food they know and how were they invented?Step 9Language points: explain the key words and phrases in section B-1.Step 10Examples and exercises about the language points.