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Read the text again and find the main idea of each paragraph.9. Read the following statements and say whether they are true or false. Correct the false statements: * There are some kinds of structural materials that have appeared comparatively recently, sometimes they consist of one polymer. But in building industry some complex materials consisting of a polymer and other components are used. * In many cases bricks too are very satisfactory for use in the construction. * There are some kinds of material which are brittle and cannot withstand tensile stress. * If steel is introduced into some kind of material it changes its property. * Some building materials offer a good resistance to compressive loads. * In respect of physical and mechanical properties these materials are divided into rigid, semi-rigid and soft. * Which material can be used to the best advantage for a particular part of the building, depends as well on the kind of load to which it is subjected and on the shape of the part. * One of the most significant facts about both industry land building has been research on synthetics and plastics. * Reinforced concrete is a building material in which the joint functions of concrete and steel are advantageously utilized. * Plastics consisting of one polymer are referred to as simple. After-Reading Grammar focus 1. Write all the following nouns in plural: an advantage, a brick, a fact, a volume, a field, a conductivity, an industry, a temperature, a polymer, a load, a production, a development, a concrete, a factor, a choice, a work, a function, an appearance, a steel. 3. Make the following sentences negative and put into the interrogative form: * There are two kinds of reinforced concrete. * Reinforced-concrete structures and elements are widely used both for residential houses and industrial buildings. * It is most advantageous to employ reinforced concrete in such structural elements. * Reinforced concrete is a building material in which the joint functions of concrete and steel are advantageously utilized. * In many cases bricks are very satisfactory for use in the construction. * There are other kinds of bricks which are more effective. * Light-weight building bricks differ from ordinary clay bricks in a lower volume weight and lower thermal conductivity. * One of the most significant facts about industry land building has been research on synthetics and plastics. * Application of plastics in the building field widens from year to year. * Plastics consisting of one polymer are referred to as simple. Find all the sentences from the text in the Passive Voice. Copy them in your exercise-books. 5. Find all the sentences from the text in the Present Perfect. Copy them in your exercise-books. Get talking Make up a plan to the text. 2. Work in pairs. Discuss: A) an application of two kinds of reinforced concrete. B) Using bricks in construction. Your talk should include 15—20 phrases. 3. Give a summary of the text in 100 words. Unit13 UNITS MATERIALS SCIENCE AND TECHNOLOGY 1. Read and translate the text.
Part 1 Date: 2016-03-03; view: 1188
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