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VII. Main idea Which statement or statements best express the main idea of the text? Why did you eliminate the other choices?

 1. Main memory is more important than auxiliary storage units.

 2. Memories of digital computers use transistor circuits of various types.

 3. Semiconductor materials are applied to control electric current flow.

VII. Understanding the passage Decide whether the following statements are true or false (T/F) by referring to the information in the text. Then make the necessary changes so that the false statements become true.

T F

1. Semiconductor memories aren’t very popular because they are very expensive.

2. Computer memory stores information in the form of generally-accepted characters: letters and numbers.

3. Semiconductor memories can store larger volumes of information.

4. Computer memory stores only programs for their further usage.

5. Main units of the computer use special convention devices to store electronic signals

6. Semiconductor memories depend on electricity.

7. Most computer systems have one memory unit.

IX. Locating information Find the passages in the text where the following ideas are expressed. Give the line reference.

…… 1. The operating principle of the main memories in digital computers.

…… 2. There are two types of memories in computer systems.

…… 3. Semiconductor materials are widely used in transistors.

…… 4. Information is stored in memory on different basis.

…… 5. Semiconductor memories have a number of advantages.

X. Contextual reference Look back at the text and find out what the words in bold typeface refer to.

1. … information of this sort…

2. … it contains numerous individual…

3. … that can be held…

4. … because of their low cost…

5. … they contain…

6. … each of which stores…

7. … they lose their contents…

(l. 5) ………………………

(l. 6) ………………………

(l. 13) ………………………

(l. 26) ………………………

(l. 28) ………………………

(l. 29) ………………………

(l. 31) ………………………

XI. Understanding words Refer back to the text and find synonyms for the following words.

1. constant

2. kind

3. to store

4. to use

5. volume

(l. 3) ………………………

(l. 5) ………………………

(l. 5) ………………………

(l. 24) ………………………

(l. 30) ………………………

Now refer back to the text and find antonyms for the following words.

6. constant

  1. neither

  2. main

  3. high

10. to keep

(l. 3) ………………………

(l. 8) ………………………

(l. 17) ………………………

(l. 27) ………………………

(l. 31) ………………………