Прочитайте текст The Jukkasjarvi Icehotel in Sweden is an interesting and cold place for a holiday. ...: ответ на тест 800555 - Английский язык

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The Jukkasjarvi Icehotel in Sweden is an interesting and cold place for a holiday. It started life as an igloo (a small house made of snow) at an art exhibition in 1989.
Hundreds of people visited the exhibition and some even slept there, so the builders decided to make it a hotel.
The Icehotel is open for less than half a year. Every May it melts and every November it is rebuilt. It now measures 5000m2 and it needs 14,000 tons of ice and 30,000 tons of snow to build it. This actually means that it is more than 88% snow.
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How long is the Icehotel open for?

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The Jukkasjarvi Icehotel in Sweden is an interesting and cold place for a holiday. It started life as an igloo (a small house made of snow) at an art exhibition in 1989.
Hundreds of people visited the exhibition and some even slept there, so the builders decided to make it a hotel.
The Icehotel is open for less than half a year. Every May it melts and every November it is rebuilt. It now measures 5000m2 and it needs 14,000 tons of ice and 30,000 tons of snow to build it. This actually means that it is more than 88% snow.
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How long is the Icehotel open for?

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The properties of a metal can be further improved by use of heat treatment. Heat treatment is the term given to number of different procedures in which the properties of metals and alloys are changed. It usually consists of heating the metal or alloy to a selected temperature below its melting point and then cooling it at a certain rate to obtain those properties which are required. For example, hardening is used to make metals harder. Tempering makes them softer and less brittle. Annealing is carried out to make a metal soft so that it can be machined more easily. In this way, metallic materials can be produced to meet every kind of engineering specification and requirement.
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What makes metals softer and less brittle?

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Steel, copper and aluminium are used in making engineering products.
Steel is a grey plastic material. It is heavier than aluminium but it is the hardest and the strongest of these three metals.
Copper is a red metal. It is harder and stronger than aluminium and more flexible than steel. But copper is the heaviest and the most expensive metal. The lightest and the most flexible of these materials is aluminium. It is a white hard metal.
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What kind of metal is aluminium?

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We use metals for a variety of engineering purposes. Some metals have ductile properties. If a metal is ductile, it can be pressed into a new shape. Copper is an example of this. It is a ductile metal because it can be stretched into another shape. Lead can be also pressed into a new shape.
Copper is a good conductor of electricity. We often use it for electrical conductors. And lead can be used for electrical cables because it resists corrosion.
Cast iron is unlike copper and lead. Its shape cannot be altered and it is not able to resist corrosion.
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What kind of conductor is copper?

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The Egyptian pyramids are huge structures which are almost 4,600 years old. The Pyramid of Cheops consists of 2,300,000 stones. Each of the stones weighs 2.5 tones.
According to the usual explanation large blocks of stone were cut in the mountains and then transported with the help of the most primitive equipment. So about 100 thousand people had to take part in the construction.
But the modern experiments show that the stones of pyramids were made synthetically. The Egyptians produced some special solution. Later they mixed it with one of the minerals. It took them several hours to transform this mixture into very hard rock. This rock was produced just on the construction sites and so there was no need of transporting heavy stones.
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How much does each of the stones weigh?