高二下学期英语译林版选修7Unit1 Living with technology Welcome to the unit课件(共29张PPT)

(课件网) Which do you think is the most important?Why? Is there anything that you don’t think is useful? Do you know how have these electrical and electronic devices developed? Look at the pictures below and describle what you see. Early TV had antennae(天线) on top. The screen was very small and could show only black-and-white pictures. The size of the TV was small compared with modern TV, and usually it looked like a wooden box. Early TV also did not have a remote control. The control panel(仪表板) was on one side of the screen.