Переведите и определите тип условных предложений (реальное, маловероятное, нереальное), а также определите, к какому времени они относятся.

A. Should a permanent magnet be moved in and out of a coil of wire, both the magnet and the coil would be used as a simple electric generator.

B. It would have been impossible to launch space satellites and space rockets provided we had not had the necessary polymeric materials and synthetic fuels.

C. Were the temperature increased, the velocity of the molecular motion would also be increased.

D. If you were asked: " How can electric charges be made to flow and what factors influence their flow? " what would you answer?

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the unique telescope

For more than four centuries telescopes have been the Earth's window on the universe. But the views they give have been limited by the size and shape of the instruments. Now scientists in many countries are developing bigger telescopes that will enable astronomers to look deeper into the comers of the universe. The main principle of a telescope is: the larger the mirror, the clearer and brighter the reflected image will be.

The world's largest optical telescope is in the North Caucasus at 2, 100 metres above the sea level. It was designed and created at the Leningrad Optical and Mechanical Association (LOMO). The main part of the telescope is the mirror which is six metres in diameter and weighs 42 tons. The mirror's area is about 30 square metres and it has been polished to the highest degree of accuracy. The telescope is housed in a tower with a revolving 1, 000-ton dome.

Many countries have developed large-size optical telescopes in the recent 30 years, but this telescope is the most powerful. The following gives an idea of what the telescope can do. With this telescope a candle flame can be seen from a distance of 25, 000 km. Its power is 40-50 million. times greater than that of a naked eye. With this telescope astronomers can investigate the most remote bodies in the universe. It will help to solve many important scientific problems, thus making a great contribution to the mankind's knowledge. Astronomers have used the telescope to take several unique photographs of Stars. The development of this unique telescope is a great achievement of Russian science and technology.

Выберите правильный ответ в соответствии с содержанием текста.

1. What is the main principle of a telescope?

a) the smaller the mirror, the brighter the reflected image;

b) the lighter the mirror, the brighter the reflected image;

c) the larger the mirror, the clearer and brighter the reflected image.

2. Which is the main part of an optical telescope?

a) a revolving dome; b) a mirror; c) an electronic control unit.

3. What can astronomers investigate with this unique telescope?

a) our star – the Sun; b) man-made satellites; c) the most remote bodies in the universe.