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Sam: betty, quickly turn on the 5th channel. betty: why? what's on? sam: my favourite tv show starts now. betty: you mean that program about science and technologies? sam: yes, exactly. they tell lots of interesting things about new technologies.betty: do they tell you that watching too much tv is unhealthy? sam: come on, betty. don't be a bore. betty: well, i wouldn't if you hadn't occupied the only tvset in the house for twenty-hours a day sam: this show lasts only for half an hour. then i'll let you watch what you want. betty: ok, turn it on. sam: look! they are speaking about the history of tv betty: that's exatly what we need to know right now. in my opinion, tv was invented long before we were born. sam: of course. along with the radio it was one of the earliest broadcasting tools. the first mechanical televisions were sold in 1928. later on, there were the first mass-produced units.betty: well, the tv was black-and-white then. when did the color tv appear? sam: as far as i know, they came into wide use in late 1960s.betty: i still remember our first tv. it seems to be so old-fashioned now, when there are thousands of digital, lcd, plasma tvs.sam: you're right. we've also had a video recorder, which was gradually replaced by dvd player. betty: why do people invent so many unnecessary devices? sam: why unnecessary? i think they all make people's life easier. it's called the technological progress. each year, there are newer devices launched on the market. imagine how you would live without a vacuum-cleaner or a microwave. these automatic machines are nearly in every house today.betty: on the one hand, you are right. we really need such devices like washing machine, microwave, dishwasher, vacuum cleaner in the house. however, when it comes to tv, i think that we could easily live without it.sam: you're saying that because you have a computer. if you didn't have it, you would watch tv more often.betty: that's true. i watch most of the films on my laptop.sam: in my opinion, computer is the same tv only with additional information and facilities. it also has a screen and you can watch whatever you like on it.betty: yes, but in addition i listen to music, type my homework, chat with my friends, edit photos, read the news and find all the necessary information via internet.sam: i still think that tvset is a great invention. in fact, many modern tvs allow you to connect laptop or any other devices to it so that you can work on a larger screen.
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