Вопрос № 1072298 - Английский язык

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Brick, stone, and timber are known to be the oldest building materials. Bricks belong to artificial (man-made) materials. Their production started in prehistoric times. Since then they have been produced and tested in all types of climate and in many countries. Thousands of years ago the builders in Egypt already knew the advantages of bricks and used them for construction. In those days the production of bricks was quite different from the modern one. Bricks were produced not by burning but by drying in the sun, as it was much sunshine in Egypt all the year round. Brick work was also popular in Rome, there being very few growing forests and as a result little timber there.

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Brick, stone, and timber are known to be the oldest building materials. 1 _______. Their production started in prehistoric times. 2 _______. Thousands of years ago the builders in Egypt already knew the advantages of bricks and used them for construction. 3 _______. Bricks were produced not by burning but by drying in the sun, as it was much sunshine in Egypt all the year round. 4 _______.

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Concrete is considered to be a universal material for construction. Different 1_______ of concrete can be used practically for every building purpose. The raw materials for producing 2_______can be found in every part of the world. There exist different ways of producing concrete. It can be 3_______ by mixing the ingredients and pouring the mixture into position on the very site of building. Concrete can also be produced in a factory, and 4_______ as a material for manufacturing prefabricated blocks.

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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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Ceilings are considered to be extremely 1_______ parts of any room. A well-designed ceiling is one of the most pleasing features of a 2_______. In modern constructions the variants of ceilings are limitless. Ceilings can be produced of many various materials both 3_______ and artificial. Their colours, texture, pattern, and shapes are of great importance for the visual impression of the room. Ceilings of any materials may be attached to wood joists. Usually they are 4_______ very carefully and tightly.

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Concrete is produced by combining coarse and fine aggregates, Portland cement, and water. Coarse aggregate is generally gravel or crushed stone, and fine aggregate is sand. Cement, sand, gravel, and water are taken in proportional amounts and mixed. The quality of concrete depends mostly on the quality of the cement used. The process of production consists in pouring the mixed components into forms and holding them there until they harden. The process of hardening generally lasts for about 28 days.
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What does the quality of concrete depend on?