【正文】
ints: A: When was the telephone invented? B: I think it was invented in 1876. 四、 Teaching Aids: 1. a tape recorder 2. the blackboard 3. a puter with PowerPoint 五、 the first period(for one class) 六、 Teaching steps Step1:Leadin How much do you know about them? Ask Ss to look at the pictures on PPT413 and say something about them. Step2: Learn the new words On PPT14 Step3: Look at the things below. In what order do you think they were invented? Discuss them with your group. Then number them [1– 4] (1 = first, 4 = last). Ss can use following conversation: A: I think the TV was in