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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: 1287
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