Air pollution influences our health in many ways. No air means death. Though we can't see it, there is air around us. Air is everywhere and it gives a life to every living things. But bad air makes people ill. In the city, there are a great many people and there are too many cars running on the road. The cars send out bad gases (气体). There are many factories too. From the chimneys (烟卤) of these factories, we get the smoke usually in black colour. Every day we breathe it in and out. This makes us feel sick. When people talk about air pollution, they are usually thinking about outdoor air pollution. But a lot of air pollution comes from indoor activities such as smoking and cooking. Indoor air pollution can hurt people's eyes, noses and throats. So air pollution, both indoor and outdoor, can also lead to lung cancer (肺癌) and heart disease.

    Everyone should help fight against pollution. In order to keep us healthy, we have to go out to the countryside to breathe more fresh air. Or we can climb up hills to get more fresh air.

The population has 1.8 million.

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    Why do people wear clothes? "To make me warm and1my body" will probably be the answer. That's2people wear clothes, but people3want to look attractive and appear4to others.

    If people only wore clothes for warmth and to cover5bodies, most clothes would be6and cheap. In many countries,7, clothes are sometimes very expensive. The main reason8this is not the cost of the materials or the cost of9clothes. The clothes are expensive10they are fashionable.

    Successful businessmen, for example, often wear very expensive suits, shirts and ties. So they pay11dollars for a suit and hundreds of dollars for a tie. It's still just a suit and12tie, but they pay these prices because of the famous designer.

    Fashion13. It means that people14want to be fashionable have to buy new clothes every few months, even if last month's clothes have only been worn once or twice. Some people have wardrobes (衣柜)15clothes, but some of these clothes have never been worn. These clothes are no longer in fashion though they are still new.