Расположите пропущенные предложения в таком порядке чтобы получился связный текст Scientific theori...: ответ на тест 439396 - Английский язык

Расположите пропущенные предложения в таком порядке, чтобы получился связный текст
Scientific theories consist of general principles or laws that attempt to explain how and why something happens or has happened.
 1_______. Scientific study can be divided into three major groups.  2_______. As scientific knowledge has grown and become more complicated,
many new fields of science have appeared. 3_______. Numerous areas of science overlap each other and it is often hard to tell where one science ends and another begins. 4_______.

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1_______.  A theory is considered to become a part of scientific knowledge if it has been tested experimentally and proved to be true.
2_______. As scientific knowledge has grown and become more complicated,
many new fields of science have appeared. 3_______. Numerous areas of science overlap each other and it is often hard to tell where one science ends and another begins. 4_______.

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1_______. The laser medium can be a solid, gas, liquid or semiconductor.
2_______. A ruby laser is a solid-state laser which emits at a wavelength of 694 nm. Other lasing mediums can be selected based on the desired emission wavelength, power needed and pulse duration. 3_______. The reason that CO2 laser is so dangerous is because it emits laser light in the infrared and microwave region of the spectrum. 4_______.

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Henry Royce did not like his Decauville car, which ran badly and often broke down. 1_______. Charles Rolls, a car manufacturer, was very impressed by Royce’s car, and soon Rolls and Royce went into business together. 2_______. In 1907, a Silver Ghost broke the world’s endurance record by driving 14,371 miles (23,120km) without breaking down once. After the drive, it cost over Ј2 to put the car back into the perfect condition. It is not surprising that the Silver Ghost was called ‘the best car in the world’. 3_______. The cars are made very carefully. 4_______.

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1_______. Today’s inhabitants of the caves have come here to escape the noise and confusion of modern life. 2_______. ‘It’s cool in the summer and warm in the winter. I don’t want to live in a big modern building in a big city.’ People there love their homes.3_______. ‘It’s all natural,’ said Mustafa Yedek, a local tour guide. 4_______. The air is clean; they didn’t use chemicals to build these homes! ‘We think the caves can add a good fifteen years to the length of your life,’ said Mr Yedek.

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 The Montgoflfier brothers built the first hot-air balloon in France.
1_______. They went up in a basket on September 19th, 1783. 2_______. The first men went up on November 21st, 1793. They travelled nine kilometers in twenty-five minutes.
3_______. The balloonists were two Englishmen in India. The biggest hot-air balloon is the Gerald A. Heineken. 4_______.