Lead-in: 1._ plays an important role in exploring the unknown fields and realizing the dreams of our ancestors（祖先）.Science andtechnology2.High technology has a direct effect on our life. What electrical and electronic appliances(电器) do you have at home?TV setremote controlrefrigerat orwashing machinemicrowave ovenair-conditionflatirondust catcherelectric rice cookerelectromagnetic ovenkitchen ventilator(油烟机) cooking utensils（炊具） desktop laptopdigital cameraDVDmicrophoneMP4MP3cellphonetelephonetape recorderelectronic calculatorelectric fanhair dryerHow have these electrical and electronic devices improved our lives? Make a group of four and talk about their functions.Device How to improve our life(functions) TV cellphone refrigerator washing machine air-condition microwave oven computer MP3/MP4 U-diskTimeline 1982 electric fan 1984 TV(black-and-white) 19851985 refrigerator 19861986 washing machine 19871990 TV(colour) 19881997 air-condition 19892001 mobile phone(with basic functions) 19902004 mobile phone(with MP3 and camera)What can you conclude from the timeline?The development of electric devices:development of TVblack-and-white TVcolour TVLCD screendesktoplaptopPalm development of computerdevelopment of dictionarydictionaryelectronic dictionarydevelopment of communicationletter/telegramtelephonebeepercellphonedevelopment of cameramobilephone with a cameradigital camera cameradevelopment of audio(音响) devicegramophone(留声机)radio/tape recordermp3CD playerdevelopment of fanfanair-conditionelectric fanDiscussion:1.What can our human beings benefit from the development of electric and electronic appliances?2.Can we depend on these appliancescompletely?Summary With peoples hard work and intelligence, human beings own lots of useful and handy electric and electronic devices.These devices do make us save a lot of time and energy. Besides, they free us from heavy housework. But we should not depend completely on them. We human beings should make reasonable use of them so that we can relax ourselves and find pleasure and happiness in our life.Homework 1.Read two passages on P106-107 2.Preview reading. 3. Unit Revision: Period 1.