Read and understand this text. Answer the questions below

Make up sentences with new words and expressions. Pay attention to prepositions.

Answer the questions. Pay attention to the Passive Voice.

Read correctly and translate the name of the elements and substances given in the picture.

Find the pairs of synonyms.

accumulate, give off, take out, bone system, harmful, concentrate, bring out, adverse, deplete, injurious, skeleton, weaken, emit.

5. Divide the substances into four groups: a) heavy metals; b) heavy metal compounds; c) gases; d) organic compounds. Comment your choice.

Model: Lead belongs to the group of heavy metals. Ammonia is included in the group of harmful gases.

lead, mercury, fluorine, plumbum oxide, formalehyde, nickel, cadmium, arsenic, fluoride, organic lead, sulphur dioxide, plumbum, nickel carbonyl, carbon oxide, mercaptane, methane, ozone.

1. Where are heavy metal compounds accumulated?

2. What organs and systems does lead (CO, mercury) get into?

3. Where can chromium (fluoride) be concentrated in?

4. What organs contain nickel (cadmium, arsenic)?

5. What systems and organs does CO (vanadium) influence?

6. What substances are concentrated in the nails, hair and skin?

7. What compounds are hardly removed from the organizm?

8. What substances tends to be accumulated in the human body?

8. Describe the picture. Begin with the phrase «As it is shown in the picture...» or «As I've learnt from the picture...»

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