Lesson 15

  1. Lesson 10
  2. Lesson 11
  3. Lesson 12
  4. Lesson 13
  5. Lesson 14
  6. Lesson 16

: . 䳺, , .

Section I

Ex. 1. Practise your pronunciation.

a) physicist [Tizisist], previously fprirvjosh], among ['], weight [weit], aggregate [ 'acgngat], encyclopaedia [in, saikb'pi: dio], distinguish [dis'tiggwij], although [ : ], unchallengeable [ / 1 | <11], predecessor [ 'prr.discsoj, half [ha: Q, precise [pri'sais]

b) 'calledytheNparticlcs,' thescNparticles, theu'Grcek \ word, thc ^' rapid \ progrcss, isuwellJUusMrated, in0thc ^ 'carly \ ycars,' endsuwith ^ the \ words, moughtjhat, arcJnVfavour, inJavour ^ of ^ theMhcory, 'half ^' centuryMater

c) / Now | we have pre'cisc knowledge | of the 'structure and' properties | of 'atoms and \ molcculcs.

Ex. 2. Pay attention to the structure of the following words. Translate them into Russian:

a) 'extract - cx'tract,' progress - pro'gress, 'import - im'port,' export - ex'port, 'increase - in'crcasc,' present - pre'sent, 'compound - com'pound , pre'eipitate - precipi'tate

b) physics, mathematics, economics, dynamics, electronics

c) irregular, irrespective, irrational, irrccognizablc, irreligious, irremovable, irreplaceable

Ex. 3. Define the meanings of the word about in the following sentences:

1. Our knowledge about atoms greatly increased during the twentieth century. 2. The student was about to comc into the room when I stopped him. 3. A theory usually involves some idea about the nature of some part of the Universe. 4. The mixture is about to explode, stop heating it. 5. At what time do you usually get up? - At about 7. 6. They were about to leave when the telephone rang. 7. The Mendeleyev system has served for about a century as a key to discovering new elements. 8. About one-fifth of the air by volume is oxygen. 9. There is nothing special about this process. 10. You know too little about selenium.

Ex. 4. Find the predicate and the subject in the following sentences:

1. As it was verified by further work in chemistry and physics, Dalton's atomic hypothesis became the atomic theory. 2. In the early years of the twentieth century, atoms were defined as the imaginary units. 3. It has more than once happened in the history of scicncc that a hypothesis has been abandoned.




Text 9 | Fluorine | Lesson 10 | Text 10 | Lesson 11 | Fascinating Phosphorus | Modifications of Phosphorus | Lesson 12 | Chemical Symbols for Representing Compounds | Weight of 12 atom of carbon 12 |

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