【正文】
ok at the pictures and the years on the 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?