Расположите пропущенные предложения в таком порядке чтобы получился связный текст. It is a well-know...: ответ на тест 912016 - Английский язык

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The roof is a necessary component of practically every 1_______. It serves to protect the interior of the building from rain, snow, wind, and cold. There exist many types of 2_______, the main ones being sloping roofs and flat ones. It is a well-known fact that every roof should 3_______a covering. The type of covering of a roof mainly depends on the 4_______ of the roof and some other factors.

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The roof is a necessary component of practically every 1_______. It serves to protect the interior of the building from rain, snow, wind, and cold. There exist many types of 2_______, the main ones being sloping roofs and flat ones. It is a well-known fact that every roof should 3_______a covering. The type of covering of a roof mainly depends on the 4_______ of the roof and some other factors.

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The fundamental purpose of a door is to provide access into or out of a building. Doors also serve for providing access into or out of various compartments of a building.
Doors also have the following functions. They provide:
1. Security;
2. Weather resistance;
3. Fire-resistance;
4. Thermal insulation;
5. Sound insulation.
As to exterior doors, they must be well-designed and properly constructed. They must not leak air, wind, heat and water.
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The fundamental purpose of a door is …

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In modern times bricks can be made of concrete, mortar, of burnt clay and of a combination of some other substances. For example, different types of clay and shale can be used as raw materials. Accordingly, bricks produced nowadays have different sizes, shapes, colours, and textures. Bricks also vary with the method of fabrication and temperatures of burning. It should be noted that some types of brick, such as, for example, salmon bricks are underburnt and highly porous. Naturally, their strength is extremely poor. This property of salmon brick should be taken into account when choosing brick material for construction. But there exist many other types of brick that are extremely strong and almost glass hard. Between these extremes there lie some other types of brick with different properties. Brick properties are of great importance and should be taken into account while choosing material for construction purposes.
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Different types of clay and shale …

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Prestressed concrete is a relatively young product. It started to be widely used only during the last few decades, and is still gaining popularity. The reason of its popularity is its usefulness. The main good qualities of prestressed concrete are its high strength and durability. In prestressed concrete, concrete is combined with steel. This combination is highly advantageous. It serves the purpose of producing a compressed stress in the concrete as a building material. For this reason any member of beam is under constant compression and as a result has no cracks. In modern times this type of concrete serves as construction material for beams, for pipes, and columns, storage tanks, water towers and the like.
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The reason of popularity of prestressed concrete is …

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The Egyptian pyramids are famous symbol of ancient Egypt. The stone structures were usually tombs for pharaohs. The pyramids have square bases with sloping sides which meet at an apex. The first pyramid was built in about 2600 BC and is over 140m high. One of the biggest pyramids is made of enormous stone blocks which weigh up to 200 tons each. It is estimated that 20–25,000 people worked for 20 years to build each pyramid.
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The first pyramid was built in …