Вопрос № 912015 - Английский язык

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The traditional frame material for windows is wood. But in the last decades aluminum, steel, plastic and combination of these materials are also commonly used. Wood is known to be a good thermal insulator and is extremely workable. It is easily turned into sashes. But its disadvantage is that it shrinks and swells when the weather conditions change.
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What is the disadvantage of wood as a frame material?

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Being the oldest building material, wood is also known to be the only naturally growing organic material. 1_______? Hardly so, because wood always contains some water which decreases its strength. 2_______. It is a well-known fact that the drier is the cut wood the greater is its strength and hardness.
Trees are known to grow naturally, which makes wood a constantly renewable natural resource. 3_______. But, as any other construction material, wood has its disadvantages. The main ones are the following – it is not fire-resistant, it easily burns. 4_______.

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It is a well-known fact that every roof should have a covering. 1_______. The pitched roof is known to dry itself quickly of water. Therefore it can be covered with roofing materials consisting of small individual units. 2_______. These materials are widely used and popular as roofing coverings since they have a number of useful qualities. 3_______. Secondly, they are easy to repair since they are individual and small. 4_______. So if a pitched roof is manufactured of properly chosen material and is well installed, it looks beautiful and attractive.

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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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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 …