Прочитайте текст и определите какой из заголовков соответствует тексту It has been known for centuri...: ответ на тест 284176 - Английский язык

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It has been known for centuries that certain black, heavy stones have the property of attracting iron, this property being called magnetism. A body that exhibits magnetism is called a magnet. The two parts of a magnet that show the strongest magnetism are called the North pole and the South pole.

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It has been known for centuries that certain black, heavy stones have the property of attracting iron, this property being called magnetism. A body that exhibits magnetism is called a magnet. The two parts of a magnet that show the strongest magnetism are called the North pole and the South pole.

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Any instrument for measuring electricity is known as an ammeter. An ammeter is used for measuring current in amperes. The abbreviation for the ampere is amp. there are very delicate ammeters that are used for measuring very small current. They are known as a milliammeter and a microammeter. The device for reading a thousands of an ampere is called a milliammeter while a microammeter is a device for reading a millionth of an ampere.

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Yesterday from 4 till 6 o’clock Ann and Alice were working in the laboratory. They were studying different electrical devices and instruments. One of them, a multimeter, was on their demonstration table all the time.
The multimeter is used for measuring three types of electrical units, namely: voltage, resistance and current. This device has several scales, a needle, a function selector, two leads, a crocodile clip and a probe.

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Henry Cavendish was born in 1731 and died in 1810. He was an English nobleman who did scientific experiments as a hobby. In 1781 he made the important discovery that water is not an element but a compound of the gases we now call hydrogen and oxygen. He described his experiments to the Royal Society in 1785.
His method was new. He showed that if electric sparks are passed through a mixture of hydrogen and oxygen the two gases combine explosively and form water. This was a dangerous experiment. Cavendish did his experiment safely;
he wisely used a strong brass container for the gases. He also passed electric sparks through air and found that gases which readily dissolve in water form acids. We explain this reaction today as follows: oxygen and nitrogen combine and form oxides of nitrogen.
Cavendish also noticed that air contained a small proportion of a gas which did not combine with any other gas even if we pass electric sparks through it for a long time. Now we think that this gas was probably argon, one of the inert gases. It was rediscovered many years later.

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     In algebra, letters are used to express the general properties of numbers.
     Representing one number by the letter a and another by the letter b, we can write the equality.
                                   a x b=b x a
or, more shortly, ab=ba.
     If no other sign is indicated, the multiplication sign is understood between any two letters written side by side.
     To represent numbers letters of the Latin alphabet are generally used.