Unit 9 When was it invented? Section B 1a-2c Learning goals:1. Let the students talk about different kinds of food they like and why2. Listen to the tape and finish the exercise.Step 1 Preview Translate the following sentences.1. 薯条是无意中被发现的。2. 顾客说它们不够咸。3. 然后他在它们上面撒了很多盐，所以它们很咸。4. 最后顾客高兴了。答案：1. Potato chips were invented by mistake.2. The customer thought the potatoes werent thin enough.3. And he sprinkled lots of salt on them so they were really salty.4. The custom
