Grammar focus

After-Reading

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.

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.

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