Прочитайте текст и определите какой из заголовков соответствует тексту. In overseas communications t...: ответ на тест 857127 - Английский язык

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Satellite radio
1. A satellite radio or subscription radio (SR) is a digital radio signal that is broadcast by a communications satellite, which covers a much wider geographical range than terrestrial radio signals. Satellite radio offers a meaningful alternative to ground-based radio services in some countries, notably the United States. Mobile services, such as Sirius, XM, and Worldspace allow listeners to roam across an entire continent, listening to the same audio programming anywhere they go.
2. Radio services are usually provided by commercial ventures and are subscription-based. The various services are proprietary signals, requiring specialized hardware for decoding and playback. Providers usually carry a variety of news, weather, sports, and music channels, with the music channels generally being commercial-free.
3. In areas with a relatively high population density, it is easier and less expensive to reach the bulk of the population with terrestrial broadcasts. Thus in the UK and some other countries, the contemporary evolution of radio services is focused on Digital Audio Broadcasting (DAB) services or HD Radio, rather than satellite radio.
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Прочитайте текст и выполните задания.
Satellite radio
1. A satellite radio or subscription radio (SR) is a digital radio signal that is broadcast by a communications satellite, which covers a much wider geographical range than terrestrial radio signals. Satellite radio offers a meaningful alternative to ground-based radio services in some countries, notably the United States. Mobile services, such as Sirius, XM, and Worldspace allow listeners to roam across an entire continent, listening to the same audio programming anywhere they go.
2. Radio services are usually provided by commercial ventures and are subscription-based. The various services are proprietary signals, requiring specialized hardware for decoding and playback. Providers usually carry a variety of news, weather, sports, and music channels, with the music channels generally being commercial-free.
3. In areas with a relatively high population density, it is easier and less expensive to reach the bulk of the population with terrestrial broadcasts. Thus in the UK and some other countries, the contemporary evolution of radio services is focused on Digital Audio Broadcasting (DAB) services or HD Radio, rather than satellite radio.
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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.

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Before the invention of radio, it was almost 1_______ to communicate over large 2_______. The only way to communicate with people far away was 3_______ a message or a letter with a person. People lit fires on hills as a signal to 4_______, but it wasn’t a very good way of communicating. It was very difficult to find out what was happening in distant places and news often took weeks or even months to travel around the world.