七年级英语welcometotheunit.pptx

Lead-in:1._ plays an important role in exploring the unknown fields and realizing the dreams of our ancestors（祖先）（祖先）.Science and technology2.High technology has a direct effect on our life.What electrical and electronic appliances(电器)do you have at home?TV setremote control refrigeratorwashing machine microwave ovenair-condition flatiron dust catcherelectric rice cookerelectromagnetic ovenkitchen ventilator (油烟机油烟机)cooking utensils （炊具）（炊具）desktop laptopdigital cameraDVDmicrophoneMP4MP3cellphonetelephonetape recorderelectronic calculatorelectric fanhair dryerHow have these electrical and electronic devices improved ourlives?Make a group of four and talk about their functions.Device How to improve our life(functions)TVcellphonerefrigeratorwashing machineair-conditionmicrowave ovencomputerMP3/MP4U-diskTimeline 1982 electric fan1984 TV(black-and-white)1985 refrigerator1986 washing machine1990 TV(colour)1997 air-condition2001 mobile phone(with basic functions)2004 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 screen desktop laptopPalmdevelopment of computerdevelopment of dictionarydictionaryelectronic dictionarydevelopment of communicationletter/telegramtelephonebeepercellphonedevelopmentof cameramobilephonewith a cameradigital cameracameradevelopment of audio(音响音响)devicegramophone(留声机留声机)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 appliances completely?Summary With peoples hard work and intelligence,human beings own lots of useful and handyelectric and electronic devices.These devicesdo 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 useof them so that we can relax ourselves andfind pleasure and happiness in our life.Homework 1.Read two passages on P106-107 2.Preview reading.3.Unit Revision:Period 1.