Прочитайте текст The function of a cladding is to prevent the passage of air between indoors and out...: ответ на тест 800561 - Английский язык

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The function of a cladding is to prevent the passage of air between indoors and outdoors of a 1_______. For this purpose it is necessary to regulate air velocities within the building. Even small air leaks are extremely 2_______. Why is it so?
It is because air leaks 3_______ water through the wall, allow vapor to condensate inside the walls, and allow noises to penetrate the 4_______ of the building from outside.

Установите последовательность пропущенных в тексте слов.
The function of a cladding is to prevent the passage of air between indoors and outdoors of a 1_______. For this purpose it is necessary to regulate air velocities within the building. Even small air leaks are extremely 2_______. Why is it so?
It is because air leaks 3_______ water through the wall, allow vapor to condensate inside the walls, and allow noises to penetrate the 4_______ of the building from outside.

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Practically every modern building is supplied with stairways of some kind. A stairway is designed to provide a means of access between different floor levels of a building. Nowadays stairways are produced of various construction materials but the most popular among them are timber and reinforced concrete. Of them timber may be used for domestic stairs of all kinds because of its economical availability. As to reinforced concrete it is popular because of its durable qualities, great resistivity to decay and great resistance to fire. It should be taken into account that domestic timber stairs must be designed for safe and comfortable use by people of different ages.
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What are the most popular materials for stairways nowadays?

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Since the Stone Age, man has found many more materials that he can work with to his advantage. His ingenuity has led him to discover the potential of many natural products. However, the materials that helped him most to develop were the metals.

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The first materials which man discovered were copper and gold, because they occur naturally in the pure state. They were used because they could be shaped easily, gold being especially soft. The discovery that copper could be obtained in sufficient quantities for beating into vessels and weapons was an important step in the use of metals, but the discovery that copper ore would produce copper was probably accidental.

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Copper had been smelted and used for two thousand years before the potential of iron become evident. In the course of smelting activities, no doubt iron ores and the substance resulting from smelting them were encountered.