3.Find words that best complete the sentences. Each line corresponds to one letter. Some letters have already been given.
1. Car _ x _ _ _ _ _ emissions are a major source of lead pollution in the atmosphere.
2. The company is very environmentally friendly: all the products come in
_ _ _ d _ _ _ _ d _ _ _ _ packaging.
3. Using energy efficiently reduces the emission of _ _ _ _ _ h _ _ s _ gases.
4. Oxygen in the atmosphere forms a screen – the ozone layer – which filters the
_ _ _ _ a _ _ _ l _ _ rays of the sun.
5. The Chernobyl nuclear power plant accident released huge amounts of r _ d _ _ _ _ _ n into the environment.
6. The dinosaurs _ _ _ d out 65 million years ago.
7. _ m _ _ _ is the major cause of air pollution in big cities.