WARM-UP 5 страница

a) on b) like c) as d) at e) in

15. The gingival margins are cleaned by a backwards and forwards motion which must... gently to avoid abrasion... the necks of the teeth.

a) to do, within b) be done, of c) to do, of d) have been done, at e) do, in

16. Oral hygiene consists... keeping the teeth free from food debris

a) simply of b) normally from c) just at d) thoroughly e) only of

17. Children and physically handicapped persons are recommended to...

a) used electric toothbrush b) use ordinary toothbrush

c) used ordinary toothbrush d) use electric toothbrush e) not to brush teeth at all

18. Teeth are cleaned rapidly and effectively as most of the movements....

a) is done automatically b) have done automatically

c) to do automatically d) would have been automatically done e) are done automatically

19. Plaque is a....

a) process of destruction of the periodontal tissues

b) film of material composed of masses of bacteria in a sticky glycoprotein matrix which adheres the roots of teeth

c) film of material composed of masses of bacteria in a sticky glycoprotein matrix which protects the surfaces of teeth

d) film of material composed of masses of bacteria in a sticky glycoprotein matrix which adheres the surfaces of teeth

e) acute inflammatory process

20. Each jaw is done....

a) at once b) simultaneously c) separately d) in time e) in turn

WARM-UP

1. Look at the tite of the text and write down all the words that you expect to find here. After reading the text see which of you have more right guesses

2. Talk about how important your computer is to you. How does it help you in your life? What things do you like doing with it? What other fields of computers’ applications do you know?