Вопрос № 911716 - Английский язык

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The reflection of 1_______________ waves from aircraft had been observed in England in the early 1930s and the possibility for aircraft detection was discussed in 1934. It was soon realized that radio waves would be the 2________________ alternative to the existing inadequate acoustic warning equipment, which merely listened for the sound of aircraft 3________________ and had too short a range for proper warning of approach of last aircraft. In contrast, experiments indicated that radar could give a warning when the 4_________________ was 100 miles or more away.

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The reflection of 1_______________ waves from aircraft had been observed in England in the early 1930s and the possibility for aircraft detection was discussed in 1934. It was soon realized that radio waves would be the 2________________ alternative to the existing inadequate acoustic warning equipment, which merely 3________________ for the sound of aircraft engines and had too short a range for proper warning of approach of last aircraft. In contrast, experiments indicated that radar could give a warning when the 4_________________ was 100 miles or more away.

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The electric charge is also called electricity. We can generate electricity to illuminate our cities or we can store it in a battery to transport it. 1_______. Copper is a good conductor so we use it in electric wires. 2_______.
A simple electric circuit includes a battery with chemical paste, a carbon rod, a wire and a light bulb. The chemical paste contains an excess of electrons so when you connect the two poles of the battery, the copper wire attracts electrons. 3_______. When they arrive at the filament inside the bulb, they produce heat and emit light. 4_______.

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Our history includes many great scientists. 1_______. Some of these changes were fundamental and scientists call them paradigm shifts. Before Copernicus’ time, most people in the West believed that the Earth was the centre of the universe and that everything else revolved around it. 2_______. Isaac Newton made a mechanical description of the universe and wrote laws of motion and gravitation and this led to the industrial revolution. 3_______. Albert Einstein explained, among other things, that everything comes from the same energy, that we are all parts of the same whole. 4_______. In some cases, however, the application of new knowledge has also caused destruction. History teaches us that opposites are inherent to nature – we construct and destroy, believe and doubt.

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1_______. Before that time Russia had no automobile industry at all, technical schools had no departments to train specialists in automobile engineering.
2_______.
The first automobile built by Shanshurenkov, a Russian inventor, was put into motion by the pedaling of the driver himself.
3_______. Mamin was one of the pioneers in Russian internal combustion engines.
4_______.

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1_______. When Benz’s three-wheeled engine-driven machine (the first “car”) appeared on the streets in 1885, people couldn’t believe that it moved without the aid of horses. 2_______. He put it onto a chassis and got power from the engine to the wheels. 3_______. Everything – the engine, fuel transmission, controls – had been developed and designed by him. 4_______.