【正文】
left. the recording for the Ss to listen. listen to the conversation and try to match the invention with the proper year. the recording again. the answers. Step 5 Pair work (1c) try to remember the inventions and the years. B, cover the A, ask Student B when the things in the picture in 1b were change roles and practice again. some pairs ask and answer before class. :When was the telephone invented? B:I think it was invented in 18