Прочитайте текст и определите какой из заголовков соответствует тексту. Telephony is the branch of t...: ответ на тест 857126 - Английский язык

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Edinburgh-born scientist Alexander Graham Bell patented his invention of the telephone in eighteen seventy-six. The following year, the great American inventor Thomas Edison produced the first working telephone. With telephones soon becoming rapidly available, the days of letter-writing became numbered.
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The telephone was invented in …

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October 23, 2008
1_______,
I am writing in connection with my order for a mobile telephone (Nokia E51) which I made in your company two days ago. Today the telephone was brought to me by your messenger. On opening the parcel I found out that you had sent me the telephone of the wrong colour. 2_______ that I had chosen the black colour, but you sent me a red telephone.
I would appreciate if you could 3_______ and send me the telephone which I ordered as quickly as possible. I am therefore returning the item for replacement.
I look forward to hearing from you soon.
4_______,
Peter Limonov

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In overseas communications, telegraph messages are transmitted over high-frequency radio (3-30 MHz), transoceanic submarine cables, or satellite communication channels. But it should be noted that the number of messages carried on high-frequency radio is constantly decreasing.
Most radio circuits operate directly between different countries of the world. As to radio telegraph transmitters, they are usually either of the frequency-shift-keying type or the single-side-band type.

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A superconductive electric cable was made by the research workers at the Power-Engineering Institute. It is a very useful device and its main property is its being cryogenic. Compared with other types of cables, it has a great advantage – its use will result in transmitting current practically without losses, which is of great importance since nowadays percentage of losses in transmitting electric power over long distances is rather high; it is ten per cent and even more.
The properties of the new cable being unique, electric current up to 10,000 amp at 10,000 V and more can be transmitted over long distances. The superconductive cryogenic transmission lines are especially efficient for Russia: the power resources of the country are known to be concentrated mainly in the eastern parts of the country while three-quarters of the industrial potential are concentrated in the European part.

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In just a few years mobile 1_______ have become a common sight everywhere. Walk past any cafe and you 2_______ people chatting on their phones or sending text messages. However, some people are concerned that the signals these phones send out may be bad for our health. They worry that holding a mobile close to 3_______ head might have an effect on your brain. So, it may be a good idea 4_______ your ordinary phone when you can.

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One of 1_______ types of radio programme is radio drama. Although some radio stations only broadcast music, 2_______ also produce plays for their listeners. Many people prefer listening to a play on the radio to watching it on TV because they can be more creative. On TV, the programme-makers 3_______ exactly what a place or a person looks like. On radio, though, you 4_______ imagine it any way you like.