Unit 6 When was it invented ?Section B (1a-1e)第三课时第三课时Step 1 Warming upStep 1 Warming up1.Let Ss watch an interesting picture.2.Ask some questions about them.What did they eat? S1:Ice-cream.What did the big dog think of the ice-cream? S2:Sweet, cool, and delicious! Well， lets look at some other delicious food, please.Step 2 TalkingStep 2 TalkingWork on 1a：1.Tell Ss that the words in the box describe how food can taste. Write them under the correct pictures. Some pictures have more than one word.2.Ss work with their partners and try to write some proper words under the pictures.3.Let some Ss read out their answers. Try to remember the new words. Work on 1b：1.Let some Ss read out the adjective words in the box. Make sure they all know the meaning of each word.2.Ss discuss with their partners. Try to write the name of a different food after each word.Step 3 Listening Step 3 Listening Step 3 Listening Step 3 Listening Work on 1cWork on 1c：1.Tell Ss the conversation is about how the potato chips were invented. The story is very interesting. 2.First, let some Ss read out the sentences in 1c.Make sure they know the meaning of each sentence.（1 1）Potato chips were invented by mistake.Potato chips were invented by mistake.（2 2）They were invented in 1863.They were invented in 1863.（3 3）The customer thought the potatoes were not thin The customer thought the potatoes were not thin enough.enough.（4 4）The customer said they were not salty enough.The customer said they were not salty enough.（5 5）George wanted to make the customer happy.George wanted to make the customer happy.（6 6）The custom was happy in the end.The custom was happy in the end.3.Play the recording for the Ss. Listen for the first time. Play the recording again and judge T or F. Keys : T, F, T, F, F, T4.Listen again and answer the questions.（1）Who invented potato chips? （2）When were they invented?（3）What did the customer order at the restaurant?（4）What did the customer think of the potato chips George cooked at first? （5）How did George cook the potatoes then?. Work on 1d：1.Let Ss read the article in 1d first. Tell Ss to listen again and fill in the blanks with the right words.2.Play the recording again for the Ss to listen and complete the sentences. The History of Potato Chips Do you know how potato chips were invented? Potato chips by a cook called George Crum.They were invented in .George Crum cut the potatoes really, really and then cooked them for a long time until they were .Finally he put lots of salt on them so they were . Keys : were invented, 1853, thin, crispy, really saltyStep 4 Pair work Step 4 Pair work 1.Work in pairs . Make a conversation about the invention of potato chips . Use the information in 1c and 1d. 2.Ask some pairs to act out their conversations in front of the class.谢谢！谢谢！