Выберите правильный союз ______ TV and the Internet affect our lives.: ответ на тест 850528 - Английский язык

Выберите правильный союз
______ TV and the Internet affect our lives.

Выберите правильный союз
______ TV and the Internet affect our lives.

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Acid rain is a kind of air pollution. It is caused by factories that burn coal, oil and gas. These factories send smoke high into the air. The wind often carries the smoke far from the factories. Some of the harmful substances in the smoke may come down with the rain hundreds of miles away.

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In the last 20 years the use of atom medicine has become so widespread that every big medical centre uses some form of it in diagnosis and treatment. Thousands of hospitals all over the world have had very successful results with radioactive iodine for thyroid cases.
The chief medical use of radioisotopes is against cancer. Every year thousands of cancer patients are being treated with radio-cobalt, which in many ways is better than X-ray treatment.

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Ultra-violet rays are familiar to most people as the particular part 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.