6. Look at the words below. What do the underlined prefixes mean in each? Match each

prefix with one of the meanings in the box.

1 deregulation 2 renewed 3 unpopulated 4 asynchronous 5 monopolar 6 bipolar 7 interstate 8 misunderstand

a not b not c not d one e two f incorrect g again h between

7. Rewrite the sentences below using words with prefixes. Do not change the meaning of

the sentence. Choose from the prefixes you are given.

un- mono- mis- re- de-

Example: The wheels are not aligned correctly. – The wheels are misaligned.

1. The conditions were not satisfactory so the test was stopped.

2. The cycle was not usual because it had only one wheel.

3. Your notes are not clear so organize them again.

4. Write this again because the style is not scientific.

5. This coil has lost its magnetic properties.

Use of English 2: grammar The Gerund

8. Open the brackets using the correct form of the Gerund. Translate the sentences.

1. __________ (to use) radioactive isotopes opens up new possibilities for medicine and agriculture.

2. John Dalton stated that atoms are incapable of __________ (to destroy) or __________

(to create).

3. The Curies' _________ (to discover) radium gave them the possibility of __________

(to discover) other radioactive elements.

4. One of the ways of __________ (to produce) tremendous energy is __________

(to imitate) on the Earth the process that makes the Sun shine.

5. We know of the atomic reactor ___________ (to feed) with uranium 235.

6. After the young scientist's report __________ (to discuss) at the conference it was published

in a scientific journal.

7. We know of Yablochkov's __________ (to find) a brilliant solution to the difficult problem of

__________ (to use) the electric arc for lighting.

8. While heavy atoms can be made to release energy by __________ (to split), light atoms,

such as hydrogen, can yield energy by __________ (to fuse) together.

9. Work on "braking" the H-bomb and on __________ (to use) the fusion process for __________

(to generate) electricity is going forward in several countries.

10. __________ (to conduct) heat and electricity is the property of most metals. Their

__________ (to be) good conductors of heat and electricity made them widely used in

industry.

Listening

9. You will hear now part of a lecture about electric power transmission. As you listen,

you will have to answer questions and complete a graph. There will be a pause after

each section of the lecture to allow you to complete the tasks.

Section 1

1. What two factors are important in the transmission of power?

2. Look at the incomplete graph (Fig. 1).

- Write down the years 1890 to 1970 on the graph according to the information given.

- Write down the numbers 100 to 900 following the lecturer’s words.

- What do the numbers in the vertical axis represent?

Section 2

Completing the graph

1. Draw the graph which the lecturer is explaining by placing dots (•) to indicate the maximum

voltages transmitted in the years mentioned.

2. Connect the dots on the graph with solid lines to show the increase in maximum transmission voltage from 1890 to 1970.

Section 3

1. Are there any direct-current transmission systems in operation at the time the lecturer is

talking about?

2. What is the main problem associated with direct-current transmission?

Fig. 1

Translation