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Unit 6 When was it invented? 第四课时 Section B (1a1e),by mistake,in the end,for a long time,potato chips,makehappy,thin enough,ustomers,istake,earthquake,instrument,sour,A,B,B,A,A,salty,to make,was invented,called,potatoes,for a long time,were made to work,by accident,What are,used,Is rice,did,buy,tall enough,C,