Прочитайте текст и заполните пропуски подходящими по смыслу словами A 1_______ mechanic while studyi...: ответ на тест 850536 - Английский язык

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A 1_______ mechanic while studying at the “Orthopedic 2_______” department as future specialist learns to make artificial 3_______ and crowns, plastics and porcelain teeth. On graduating from the college they usually work in the dental mechanic 4_______.

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A 1_______ mechanic while studying at the “Orthopedic 2_______” departments a future specialist learns to make artificial 3_______ and crowns, plastics and porcelain teeth. On graduating from the college they usually work in the dental mechanic 4_______.

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Laser is an extremely 1 _______________ device. It is nothing more than a cylinder of synthetic ruby about 1/4 2 _____________ in diameter and 1 1/2 inches long mounted in the centre of a spiral coil of glass. The coil is a xenon-filled flash 3_____________ very much like the ones 4_______________ by photographers for taking flash pictures.

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The first scientists to study colour was Sir Isaac Newton. He was an English 1_______ who lived from 1642 to 1727. Newton was the first person to 2_______ white light into different colours.
In 1861 another English scientist, James Clerk Maxwell, showed that he could make other colours by mixing the primary colours – red, blue and yellow – in different ways. These other colours are called secondary and tertiary colours. We make secondary colours by 3_______ two primary colours together. For example, red and yellow become orange, yellow and blue become green, and blue and red become violet. We make tertiary colour with one 4_______ colour.
We can make a room look bigger or smaller, hotter or colder by using colour. Green and blue are cold colours. They can also make a room look bigger. Red, orange and yellow are hot colours. They can make a room look smaller.

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Corn or maize was domesticated and 1_______by the native people of the New World when Christopher Columbus first 2_______ its shores. The cultivation of corn was of primary 3_______ to the daily diet of the Indians, who used it in 4________ a sort of bread, the tortilla.

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Heat causes some 1_______ to expand more than others. For example, copper expands more than 2_______. This effect is used in the bimetal strip, which consists of two dissimilar strips of metal 3_______ together. The strips are usually made of brass (an alloy of copper and zinc) and invar, a ferrous alloy which expands very little when heated.
An increase in 4_______ causes the brass to expand more than the invar. This expansion causes the bimetal strip to bend, and consequently a switch or a valve is activated.