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We are in the entrance hall of a big modern hotel in Moscow. The reception clerk is behind the reception desk. He gives the guests the keys to their apartments. Modern hotels have electronic locks on the doors. They are opened with a plastic card with a magnetic code. The codes are usually changed every day.
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Acid rain is a kind of air pollution. It is caused by factories that burn coal, oil and gas. These factories send smoke high into the air. The wind often carries the smoke far from the factories. Some of the harmful substances in the smoke may come down with the rain hundreds of miles away.