Прочитайте текст и определите какой из заголовков соответствует тексту Ultra-violet rays are familia...: ответ на тест 850531 - Английский язык

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Ultra-violet rays are familiar to most people as the particular art of sunlight that is "health-giving".
The effect of the ultra-violet rays is to produce in the skin the vitamin that is important for the promotion of bone-growth.
The use of these rays in diagnosis is a powerful weapon of medicine.
One of the most valuable uses of ultra-violet rays in industry is the testing of the quality of certain goods.

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Ultra-violet rays are familiar to most people as the particular art of sunlight that is "health-giving".
The effect of the ultra-violet rays is to produce in the skin the vitamin that is important for the promotion of bone-growth.
The use of these rays in diagnosis is a powerful weapon of medicine.
One of the most valuable uses of ultra-violet rays in industry is the testing of the quality of certain goods.

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We can divide all metals into ferrous and non-ferrous. Steel and cast iron are in the group of ferrous metals. They are alloys of iron with carbon, manganese, silicon and other components.
Non-ferrous metals are metals and alloys the main component of which is not iron but some other element such as aluminium, copper and others. Some of the characteristics of non-ferrous metals are high electric and heat conductivity, high corrosion resistance, light weight and easiness of fabrication.

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Probably since the time of the first humans, people have eaten honey made by bees. For many thousands of years, they took the honey from bees’ nests in trees without understanding very much about the lives of bees. Slowly, however, people realized that it would be simpler to keep bees than to have to try to find their nests. At first they kept them in hollow parts of trees or small clay containers which they hung from the trees. Nowadays in most countries they are kept in wooden hives.

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Procedural law deals with methods of enforcing legal rights and duties. Laws, which specify how and when police can make arrests and what procedures can be used in a trial are procedural laws. In contrast, substantive law defines rights and duties; it is concerned with all rules of conduct except those involved in enforcement.

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It is very useful to 1_____________ foreign languages. Knowledge of foreign 2____________ helps us to develop friendship and understanding among people.
English is very popular now. It’s the language of computers, science, 3_____________, sport and politics. It’s spoken all over the world. It is the official language of the United Kingdom, Ireland, the United States of America, Canada, and Australia. There are more than 750 million speakers of English in the 4______________.