Вопрос № 223825 - Английский язык

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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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By 2050, robots will replace people in factories. Many factories already use robots. Big companies prefer robots – they don’t ask for pay rises or go on strike, and they work 24 hours a day. By 2050, we will see robots everywhere – in factories, schools, offices, hospitals, shops, and homes.

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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?

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What is a crystal? A crystal is a geometrical solid made by a natural process. Many substances absorb water from solutions when they crystallize; that is, they unite chemically with a definite proportion of water. The water with which any substance unites during the process of crystallization is called the water of crystallization.
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What is a crystal?

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Aluminium, water, oxygen, and carbon dioxide are substances. Some substances are elements and some substances are compounds. Elements have only one type of atom whereas compounds have more than one type.
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How many types of atom do elements have?

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Boats on canal go through locks to move up or down from one level to another. The locks have large lock gates to let the boats in and out. They also have smaller sluice gates; these open and close to control the water level. The scale on the side shows the depth of the water in metres.
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What does the scale on the side of the lock show?