3. :
1. At first, the Periodic Law (was received, received) very coldly by other scientists.
2. In 1893 Mendeleev (was appointed, appointed) Director of the Bureau of Weights and Measures.
3. B. Franklin (was founded, founded) the first public library and the University of Pennsylvania.
4. , :
1. The year 1895 is considered to be the date of the invention of the radio.
2. We consider Mendeleev to be a great Russian scientist.
3. Manchester is known to be the centre of cotton industry.
5. :
1. At that time Newton began to think about construction of an astronomical telescope.
2. They made some experiments to prove their theory.
3. The procedure to be followed is described below.
6. - , :
1. He must illustrate this law by several experiments.
2. They may carry out these experiments at the laboratory.
3. She can study chemistry at the university.
7. some, any, no:
1. You must dissolve (some, any, no) salt in water.
2. Tsiolkovsky had (some, any, no) money to finance his experiments.
3. Did Tsiolkovsky make (some, any, no} experiments with the centrifuge?
8. a) . , :
A dynamo is a machine which makes electricity when it is made to rotate at a high speed. It is often driven by a turbine, which may be made to rotate by steam pressure. This machinery is then called a turbo-generator. A building which houses a turbo-generator is called a power or generating station.
Most of the world's electricity for domestic and industrial use is made or generated in power stations.
) :
1. The smallest piece of any substance (called, is called) an atom.
2. A molecule (made, is made) up of small particles called atoms.
3. We (use, are used) a lot of electrical devices at home.
) , :
1. The atom is said to be neutral when the two charges are equal.
2. We believe him to be a good electrician.
3. Electric current is believed to be the flow of electrons.
) :
1. What is a dynamo?
2. What is a dynamo driven by?
3. What is a power station?
4. Where is most of the world's electricity generated?
Vocabulary
1. the binomial theorem [bai'noumjal 'Giaram]
2. plague [pleig]
3. matter = substance ['sAbstans]
4. inversely [m'vaisli] proportional
5. the force of gravity ['grasviti]
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|
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gravitation [graeviteijan]
6. an apprentice [a'prentis] ,
7. bookbinder's [buk'baindgz] shop
8. the Royal Society [S9;sai3ti]
9. lightning ['laitmrj] rod
10. diesel engine ['diizal endsin]
11. petrol engine ['petral]
12. petrol tank
13. petrol pump
14. 2-stroke(4-stroke) engine ()
15. vehicle [Vi:ikl] , ,
16. block ,
17. valve [vaelv]
18. carburettor [^karbg'reta]
19. positive terminal ['taiminl]
20. carbon ['kaiban] rod
21. chemical paste [^kemikal 'peist] ()
22. steam pressure ['preja]
23. charge [tja:d3]
24. to increase [in'kri:s] the voltage
25. to decrease [di:'kri:s] the voltage
1. Passive Voice?
2. ?
3. ?
4. ?
5. Complex Subject?
6. , Complex Subject.
7. Complex Object; ?
8. .
9. can Past Indefinite Tense?
10. must.
11. some any?
12. any ?
4
| Countries 1. Russia 2. The USA 3. Great Britain 4. Canada | 1. Conditional Sentences ( ) 2. Sequence of Tenses ( ) 3. Gerund () |
Conditional Sentences
( )
| 1. If he works hard ( ) | He will enter the university. |
| 2. Past Indefinite ( to be were) If he worked hard , |  should
+ Infinitive ( to)
would
he would enter the university next year.
.
|
| 3. Past Perfect If he had worked hard then (), | would + Perfect Infinitive he would have entered the university. . |
