Прочитайте текст. Glass has been made into practical or decorative objects since ancient times. Glas...: ответ на тест 857120 - Английский язык

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1_______. Glass blowing was probably developed in the first century BC in Syria. 2_______.
The Roman Empire used glass more than any other ancient civilisation. 3_______. There were people, however, who regarded it as inferior to materials such as gold and silver. Gallenius, a Roman emperor, used to drink from a glass vessel because he believed that there was nothing less common than glass.
4_______. There was so much demand for Venetian glass in Europe that glassworkers of the island of Murano were forbidden to visit Venice or teach their secrets to outsiders.

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Glass has been made into practical or decorative objects since ancient times. Glass blowing was probably developed in the first century BC in Syria. With this technique the possibilities for shaping glass into different forms became endless.
The Roman Empire used glass more than any other ancient civilization. Romans adopted the technique from the Syrians and glass soon became fashionable.

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Can you imagine what the world would be like if there were no electricity? In fact, most of what we take for granted would not exist. There would be no computers, TV, cinemas or stereos for our entertainment, and we would not be able to cook and eat in the same way without cookers and fridges. If Thomas Edison had not invented the electric light bulb, we would now still be using candles to see at night. The problem with this energy source is that it uses fossil fuels – we burn coal and oil to generate electricity. Our everyday lives use a huge amount of power, and industry even more. The damage to the environment will increase if we continue to burn coal for energy, which can cause serious air pollution and increase the size of the hole in the ozone layer. Because of this danger, people are now using other sources of fuel, such as solar, wind, and water power.
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Our everyday lives use a huge amount of …

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Lead is now a very expensive metal. At one time it was used extensively for roofing and for water piping because of its softness and resistance to corrosion. But later copper and iron have taken its place. Lead is a gray malleable metal which melts at 327 ̊C, which is low for a metal. Lead is still used for roofing and for making waste pipes and sink traps because it is easily bent into shape; storage battery (accumulator) plates; storage tanks for sulphuric acid; lead shot; solder; screens to stop harmful radiation from radioactive substances. Lead monoxide is used for making glass that is brilliant and sparkling, i.e. decorative tableware.
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Lead melts at 327 °C, which is …

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Iodine, a steel-gray solid, readily vaporizes when heated. The vapor is violet in colour. If the vapor is allowed to cool, it passes directly back into the solid state. This process of passing from the solid state to the vapor state and then back to the solid state without the formation of a liquid is called sublimation. If a saturated solution of potassium nitrate is heated and then allowed to cool, crystals of the substance form on the bottom of the vessel. These are formed by precipitation, which takes place during the cooling process.
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Iodine readily vaporizes …

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The television receiver includes tube circuits for receiving, amplifying, and synchronizing the signals, and a large cathod tube called a kinescope. This part of the device converts the video impulses from the transmitting station into luminous spots on a fluorescent screen. In the kinescope the amplified video signals are applied to the grid, and through it control the intensity of the electron beam.