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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. All types of optical disks can only be read but cannot be rewritten.

 2. Both optical and magneto-optical disks use laser beams in their operating principles.

 3. CD-ROMs are used for keeping more or less static data.

VIII. 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. Magnetic properties of magneto-optical disks determine the operating principles of writing and reading.

  2. The information stored on an optical disk can be both read and rewritten.

  3. The storage capacity of optical disks isn’t large enough to store multimedia data.

  4. Adding data to a magnetic-optical disk doesn’t mean the erasure of the previous information.

  5. A photocell is used to convert digitally coded data into electric signals.

  6. Digital data is stored on a CD by heat of a low-power laser beam.

7. In magneto-optical disks every sport is magnetized in two directions, storing 0 and 1 simultaneously.

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

…… 1. CD-ROMs are employed for storing unchangeable information.

…… 2. Coded data are read by means of a special scanner and a photocell.

…… 3. A strong laser beam uses the magnetic phenomena for writing information on a magneto-optical disk.

…… 4. Stamping machine is one of the variants of storing data on compact disks.

…… 5. Magnetic field polarizes sports in magneto-optical disks storing information in the form of binary digits.

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

1. … that converts them into…

2. … because they are not rewritable…

3. … their large capacity makes them ideal…

4. … a variation of CD-ROM that allows…

5. … of spots on its surface…

(l. 7) ………………………

(l. 8) ………………………

(l. 10) ………………………

(l. 12) ………………………

(l. 16) ………………………

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

1. very small

2. to transform

3. for instance

4. to permit

5. characteristics

(l. 2) ………………………

(l. 7) ………………………

(l. 9) ………………………

(l. 12) ………………………

(l. 16) ………………………

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

  1. low-power

  2. dynamic

  3. previous

  4. following

  5. to heat

(l. 3) ………………………

(l. 9) ………………………

(l. 13) ………………………

(l. 19) ………………………

(l. 20) ………………………