Вопрос № 223896 - Английский язык

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There are many different types of lasers. 1_______. The first type of laser was called a ruby laser.2_______. 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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Teacher: Hello, my friends. Today, I’m going to show you an operating 1_______.
Ivan: That’s great! By the way, what does the word “laser” mean?
Teacher: 2_______. Looking at the operating laser one can see it producing a very powerful beam of light.
Ivan: When did the first lasers appear, I wonder?
Teacher: As far as I know, in the 1960s. Yet, we hear of their having numerous applications. 3_______.
Ivan: And how do lasers work?
Teacher: Their work is based on the principle of amplifying the light of a certain wavelength in the resonator cavity.
Ivan: I’m rather interested in making experiments with laser beams.
Teacher: Then let’s try to make one. But be very careful. Lasers can be very 4_______.
Ivan: Why are they dangerous?
Teacher: Well, they produce a very powerful beam of light and if treated in the wrong way it can hurt or even kill you.
Ivan: Oh, I’m pretty scared.
Teacher: Don’t worry. If you follow all the safety instructions nothing will happen to you.

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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. 3_______. Rolls-Royce cars are famous for running quietly: an advertisement for one model said ‘the loudest noise is the ticking of the clock’. 4_______. A lot of the work is done by hand, and they take a long time to manufacture: only twelve cars leave the factory every day.

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Sometimes the tides are very high and this can be a big problem for the towns near the cost. 1_______. London has a special mechanical ‘wall’ to stop the tide coming into the city.
2_______. In some places, the sea goes out a very long way. In the summer, for example, you can walk from England to Wales! As the tide comes in and goes out, it cleans the beaches.
In the ports, the ships wait for the high tide. 3______.
The tides can also help to make electricity.
4_______.

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1_______. Today’s inhabitants of the caves have come here to escape the noise and confusion of modern life. ‘I’ve lived in this cave for twenty years,’ says Hatice Demirci from her beautiful terrace. ‘It’s cool in the summer and warm in the winter. 2_______.’
3_______. They have electricity and water and they believe they enjoy a more healthy and relaxed lifestyle. ‘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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Lightning struck twice by our house last night during a rainstorm. 1_______. We heard the sound of thunder and we smelled the lightning in the air.
The first flash struck our neighbor’s chimney. 2_______. It pulled the lightning to it. When the lightning struck, it tore out a whole row of bricks. Our neighbors said it sounded like glass was breaking when the bricks fell.
3_______. It tore the bark off the tree. Because it was raining, the tree didn’t start to burn. However, our neighbor said that the lightning killed the tree.
We were lucky. The lightning missed our house. 4_______.