More than two hundred years ago, the term “ enviromental polution” was quite strange to people. They lived healthily,drank (1) ________ water, and breathed fresh air. In those days, industry was not well- developed. Nowadays, the (2) ________ is quite different. The world today is faced with many (3) ________ threats. The most dangerous threat of all is war, and after the threat of war is (4) ________. People all over the world are worried about things that are happening to the environment. Actually, it is man that is (5) ________ the surroundings with many kinds of wastes from the devices that make human lives more comfortable and convenient. Everybody knows that cars emit dangerous gases that cause poisonous (6) ________ and cancer, but no one wants to travel on foot or by bicycles. Manufactures know that (7) ________ from factories make water and (8) ________ polluted, but they do not want to spend a lot of their money on (9) ________ the wastes safely. (10) ________ rubbish is bad for our health, but no one wants to spend time burying it. Is it worth talking a lot about polution?

1. A. fresh             B. pure                     C. clean                         D. boiled

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