Прочитайте текст и определите какой из заголовков соответствует тексту Scientists are finding other ...: ответ на тест 284137 - Английский язык

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Scientists are finding other effects of acid rain. In some large areas trees are dying. Not just one tree here and there, but whole forests. At first scientists couldn’t understand why. There were no bugs or diseases in these trees. The weather was not dry. But now they think that the rain was the cause. Acid rain is making the earth more acidic in these areas. Some kinds of trees cannot live in the soil that is very acidic.

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Scientists are finding other effects of acid rain. In some large areas trees are dying. Not just one tree here and there, but whole forests. At first scientists couldn’t understand why. There were no bugs or diseases in these trees. The weather was not dry. But now they think that the rain was the cause. Acid rain is making the earth more acidic in these areas. Some kinds of trees cannot live in the soil that is very acidic.

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In the field of nutrition the outstanding advance of the 20th century was the discovery and the appreciation of the importance to health of the “accessory food factors”, or vitamins. Various works had shown that animals did not thrive on a synthetic diet containing all the correct amounts of protein, fat, and carbohydrate; they even suggested that there must be some unknown ingredients in natural food that were essential for growth and maintenance of health. But little progress was made in this field until the classical experiments of the English biologist F. Jowland Hopkins were published in 1912. The name “vitamine” was suggested for these substances by the biochemist Casimir Funk.

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In 1921, at the University of Toronto, Frederic Grant Banting and Charles H. Best conducted experiments that successfully isolated the hormone insulin. This hormone is used to control the disease diabetes. The name of the hormone is derived from Latin word for island, insula, because the hormone is produced in the part of the pancreas called the Isles of Langerhans.
Insulin is protein and is digested by the enzymes. Banting and Best used animal experiments to extract insulin and demonstrated that it stopped symptoms of diabetes. Commercial production of insulin uses pigs, oxen, and sheep as sources for the hormone.

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Nina Ivanova is our best ward nurse. She works at our hospital and everybody respects her very much. In the morning she always come into the ward with a smile on her face. Everything she does in the ward she does quickly and quietly. Nina makes injections, puts mustard plasters and cups. She never hurts the patient with a rude word.
The doctors say: “When Nina is at work we don’t worry. We know that everything will be all right.”

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I am a nurse. I work in a therapeutic hospital. Many doctors and nurses work at the hospital. Our hospital is very large. Work at the hospital begins at 6 o’clock in the morning. The nurses begin to take the patients’ temperature at 6 o’clock. They write it down in temperature charts. Then the nurses give the patients medicines and carry out other prescriptions of the doctors. They open the windows and air the wards. The doctors come at 9 o’ clock in the morning and begin to examine the patients. Each ward nurse tells the doctor about her patients.