Прочитайте текст Scientists consider that the oldest tools are known to the mankind are 2600000 year...: ответ на тест 439338 - Английский язык

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Scientists consider that the oldest tools are known to the mankind are 2,600,000 years old. They were used by people in manual operations and that is why they were called hand tools. By the beginning of the Industrial Revolution, people had already devised simple hand tools for cutting and shaping materials. But in the 18th century there appeared machine tools that made mass production a reality in the 19th century.
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Where were the tools used and how were they called?

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Scientists consider that the oldest tools are known to the mankind are 2,600,000 years old. They were used by people in manual operations and that is why they were called hand tools. By the beginning of the Industrial Revolution, people had already devised simple hand tools for cutting and shaping materials. But in the 18th century there appeared machine tools that made mass production a reality in the 19th century.
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Where were the tools used and how were they called?

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Nowadays machine tools play an important role in the manufacture of almost all metal products. Machinists (people who operate machine tools) use them in making automobiles, radios, refrigerators, television sets and so on. Every mechanical engineering workshop is equipped with machine tools. They are the main source for the manufacture of component parts of all machine and mechanical devices.
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Who uses machines in making automobiles, radios, refrigerators, television sets?

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Even the most advanced robots are human-controlled machines. They can’t see or hear or think. Robots do only what they are told to do usually by a computer programme. Robots are taught to fulfil thousands of factory jobs. They load heavy equipment, weld cars, and put electronic parts together. Robots can do things that are dangerous for humans. They look like mechanical arms. More and more robots look lifelike. Some of them help doctors in their work. These robots are programmed to mimic disease symptoms. Medical students practice with robots before treating human patients.
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What robots can’t do?

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G. Stephenson’s reputation as a mechanic was beginning to spread. He was asked by a firm to come as their mill engine was giving trouble. He soon found that the trouble with the engine was a lot of sand that was drawn into the pumps with the water. The sand also got into the mechanism of the engine. Thanks to Stephenson’s improvements the water from the well could reach the pump only by flowing over the rim of a box, while the heavier sand sank to the bottom outside the box.
This period when machinery was beginning to take the place of human labour is known as the First Industrial Revolution.
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Where did sand also get into?

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The properties of a metal can be further improved by use of heat treatment. Heat treatment is the term given to number of different procedures in which the properties of metals and alloys are changed. It usually consists of heating the metal or alloy to a selected temperature below its melting point and then cooling it at a certain rate to obtain those properties which are required. For example, hardening is used to make metals harder. Tempering makes them softer and less brittle. Annealing is carried out to make a metal soft so that it can be machined more easily. In this way, metallic materials can be produced to meet every kind of engineering specification and requirement.
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What makes metals softer and less brittle?