Difficult words:

cavity - tu: ubytek (w zębie)

decay - próchnica

floss - tu: nić dentystyczna

digest - trawić

lactic acid - kwas mlekowy

genetically altered - zmienione genetycznie

strip - tu: szczep (bakterii)

hydrochloric acid - kwas solny

Difficult words:

cavity - tu: ubytek (w zębie)

decay - próchnica

floss - tu: nić dentystyczna

digest - trawić

lactic acid - kwas mlekowy

genetically altered - zmienione genetycznie

strip - tu: szczep (bakterii)

hydrochloric acid - kwas solny

Difficult words:

cavity - tu: ubytek (w zębie)

decay - próchnica

floss - tu: nić dentystyczna

digest - trawić

lactic acid - kwas mlekowy

genetically altered - zmienione genetycznie

strip - tu: szczep (bakterii)

hydrochloric acid - kwas solny

Exercise:

1. The researches decided to use:

a) bacteria b) viruses c) lactic acid

to eliminate the decay.

2. The bacteria on your teeth produce:

a) sugar b) lactic acid c) hydrochloric acid

3. Genetically altered bacteria can:

a) create new strips b) protect teeth c) cure

4. The new bacteria was tested on:

a) monkeys b) rabbits c) rats

5. The results of tests on humans was:

a) negative b)there wasn't tests on humans c) positive.

Exercise:

1. The researches decided to use:

a) bacteria b) viruses c) lactic acid

to eliminate the decay.

2. The bacteria on your teeth produce:

a) sugar b) lactic acid c) hydrochloric acid

3. Genetically altered bacteria can:

a) create new strips b) protect teeth c) cure

4. The new bacteria was tested on:

a) monkeys b) rabbits c) rats

5. The results of tests on humans was:

a) negative b)there wasn't tests on humans c) positive.

Exercise:

1. The researches decided to use:

a) bacteria b) viruses c) lactic acid

to eliminate the decay.

2. The bacteria on your teeth produce:

a) sugar b) lactic acid c) hydrochloric acid

3. Genetically altered bacteria can:

a) create new strips b) protect teeth c) cure

4. The new bacteria was tested on:

a) monkeys b) rabbits c) rats

5. The results of tests on humans was:

a) negative b)there wasn't tests on humans c) positive.