3. Read the article quickly and decide which one of the following subjects it does not refert to
a) improving your brain power d) brain weight
b) men and women
e) old age
c) psychological illness
f) the physical needs of the brain
4. Read the article again and choose the most suitable heading from the list helow for each​

1. You don't break the rules of behaviour, do you?
2. Some rules seem strange to foreigners, don't they?
3. Some people in Britain do not congratulate each other on national holidays, do they?
4. It is rude to stare at strangers, isn't it?
5. You aren't British, are you?
6. You were born in America, weren't you?
7. You don't speak Russian, do you?
8. You visited your mother-in-law last week, didn't you?
9. The holiday of Christmas is more important than Easter, isn't it?
10. You will go to Germany next summer, won't you?
11. The weather in Ural isn't very good, is it?
12. Nobody came, did they?
13. Lots of people consider the British football the best in the world, don't they?

The problem starts here. Cars burn gas, factories and power plants burn coal and emit toxic fumes. Thus, the air we breathe becomes polluted.

Also, the air is polluted by acid rain. When it rains, this pollution hits trees, houses, buildings, cars, clothes, everywhere!

Pollution of water and soil. When acid rain falls into lakes, streams, rivers and seas, they become toxic. Acid rain poisons trees and plants, causing damage to buildings and objects.

The good news is that governments are trying to reduce air pollution that causes acid rain. Some industries have long used new technologies to make factory smoke less harmful to the environment. But we need to do more!