Test yourself

Task 3. Summarize the information about the Russian Federation to choose the correct answer.

1. The total area of the Russian Federation is about ______ million square kilometres.

a) 25

b) 17

c) 30

2. The Russian Federation occupies most of ________.

a) Western Europe and South Eastern Asia

b) Southern Europe and Central Asia

c) Eastern Europe and Northern Asia

3. Russia stretches from ________ in the West to the Pacific Ocean in the East and from the Arctic Ocean in the North to the Black Sea and the Caucasus.

a) the Baltic Sea

b) the Caspian Sea

c) the Black Sea

4. The land of Russia varies from thick forests to _______, from high peaked mountains to ________.

a) flat plains; lowlands

b) low ranges of hills; bleak moors

c) barren deserts; deep valleys

5. The longest mountain chains are _______ which separate Europe from Asia and the Caucasus.

a) the Sayan Mountains

b) the Urals

c) the Altai

6. The total number of rivers in Russia is over two ______.

a) million

b) thousand

c) hundred

7. The climate in Russia varies from arctic in the north to _______ in the central part of the country and subtropical in the south.

a) moderate

b) continental

c) dry

8. The current population of Russia is about ______ million people.

a) 135

b) 142

c) 110

9. Russia has the world’s largest _______ resources.

a) copper and oil

b) iron ore and coal

c) oil and natural gas

10. Three-quarters of the republic’s mineral wealth is concentrated in _______.

a) Siberia and the Far East

b) the North and the Urals

c) the West and the Altai

11. The Russian Federation is ________.

a) a constitutional monarchy

b) a parliamentary republic

c) a semi presidential republic

12. A bill becomes a law if it is approved by ________ and signed by the President.

a) the President

b) the Prime Minister

c) both chambers

13. The _______ power belongs to the Government, or the Cabinet of Ministers.

a) legislative

b) executive

c) judicial

Part 4

Science and Technology

Text

X-Rays

In 1895, a German professor Wilhelm Konrad Roentgen discovered a new kind of invisible rays. These rays could pass through clothes, skin and flesh – and cast the shadow of the bones themselves on a photographic plate. You can imagine the impression this announcement produced at that time!

Let us see how Roentgen came to discover these all-penetrating rays. One day Roentgen was working in his laboratory with a Crookes tube. Crookes had discovered that if he put two electric wires in a glass tube, pumped air out of it and connected the wires to opposite electric poles; a stream of electric particles would emerge out of the cathode (that is, the negative electric pole).

Roentgen was interested in the fact that these cathode rays made certain chemicals glow in the dark. On this particular day Roentgen was working in his darkened laboratory. He put his Crookes tube in a box made of thin black cardboard and switched on the current to the tube. The black box was lightproof, but Roentgen noticed a strange glow at the far corner of his laboratory bench. He drew back the curtains of his laboratory window and found that the glow had come from a small screen which was lying at the far end of the bench.

Roentgen knew that the cathode rays could make the screen glow. But he also knew that cathode rays could not penetrate the box. If the effect was not due to the cathode rays, what mysterious new rays were causing it? He did not know, so he called them X-rays.

Roentgen placed all sorts of opaque materials between the source of his X-rays and the screen. He found that these rays passed through wood, thin sheets of aluminium, the flesh of his own hand; but they were completely stopped by thin lead plates and partially stopped by the bones of his hand. Testing their effect on photographic plate he found that they were darkened on exposure to X-rays.

Roentgen was sure that this discovery would contribute much for the benefit of science. Indeed, medicine was quick to realize the importance of Roentgen’s discovery. Now the X-rays are increasingly used in industry and by the law enforcement bodies, especially by the Customs Services as well.

Date: 2015-09-18; view: 455; Нарушение авторских прав