VI. Прочитайте предложения в колонке а и выберите правильный вариант ответа. Запишите свой выбор в колонку в.

А

В

1. A chemist uses a) a microscope b) a balance c) a prism to weigh some substances.

1. b

2. a) Insects b) Mammals c) Amphibians are small animals which have no backbones.

3. It is a well known physical property of water that it a) boils b) evaporates c) freezes at 0⁰C.

4. The silt which is picked up by a river is a) moulded b) deposited c) shaped near its mouth.

5. Atmospheric a) change b) temperature c) pressure is measured with a barometer.

6. Lightning is a sudden a) charge b) discharge c) pressure of electricity from cloud to cloud or from cloud to earth.

7. Air a) increases b) decreases c) condenses in volume as the temperature rises.

8. The a) spark b) moisture c) climate in the atmosphere is produced by the breathing of living things.

9. Nowadays we know when to expect a) radiation b) eclipses c) explosion of the moon and sun.

10. Before the days of artificial a) satellites b) instruments c) radio, scientists used telescopes to obtain information about the planets and stars.

11. Compressed a) water b) heat c) steam is a valuable source of energy.

12. Oxygen is needed by the body a) elements b) cells c) compounds of all animals.

13. Mercury is used as a a) detergent b) catalyst c) waste in the production of plastics.

14. Oil floats on water and does not a) evaporate b) dissolve c) concentrate in it.

15. The electro-magnets generate a) current b) water c) voltage in coils of wire.

16. Carbon a) acid b) chloride c) dioxide is needed by plants to make sugars.

17. Backward a) reaction b) thrust c) propulsion produces forward motion.

18. Dams are not only used to produce hydro-electric a) turbine b) electricity c) power.

19. Reptiles are covered with a) lungs b) scales c) seeds and are cold-blooded.

20. A microscope is an instrument which a) magnifies b) solidifies c) preserves very small objects.