IV. ϳ .

  1. B. .
  2. I. a. ' . , , .
  3. II. 䳺 Present Continuous.
  4. II. .
  5. III .
  6. IV. , .
15. In ' Marie and Pierre Curie a) with the rays of uranium.
16. This strange discovery was b) importance for world science.
17. The new discovery was of tremendous c) called "natural radioactivity".
18. Rutherford made a series of experiments d) that are dangerous for people.
19. Uranium gives off invisible rays e) obtained a new substance.

, , . -ment, -tion, -ance, -y, -ant, -ity, -er, -able, -ic.

I. -tion, -ance, -ant, -ity, -y, -er, -able, -ic, . .

1. important 5. radioactive
2. measure 6. recognize
3. assist 7. transform
4. discover 8. atmosphere

II. , , 䳺. to exist, to develop, to investigate, to discover, to radiate .

9. Pierre and Marie Curie continued their ... and discovered radium.

10. They found that the strength of the ... depends on temperature and pressure.

11. Mendeleev predicted the ... of missing elements.

12. In 1896 Henry Bacquerel made his ... of radioactivity.

13. The study of rays greatly contributed to the ... of the atomic theory.




I. . | Alfred Nobel (1833 - 1896) | II. , . | | VI. , . | Thomas Alva Edison (1847 - 1931) | II. , . | Incandescent Lamps | II. . | The Invention of the Radio |

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