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cientific and Cultural Organiza tion. It was founded on November 16th, 1945. Today, UNESCO functions as a laboratory of ideas and a standardsetter to fe universal agreements on emerging ethical issues. The Organization also serves as a clearinghouse — for the dissemination and sharing of information and knowledge — while helping Member States to build their human and institutional capacities in diverse fields. In short, UNESCO promotes international cooperation among its 191 Member States and six Associate Members in the fields of education, science, culture and munication. SB: I want to talk about UN. UN stands for the United Nations, it was established on October 24th, 1945 by 51 countries. Its function is to preserve peace through international cooperation and collective security. Today, there are 191 countries which are the members of the UN. Listening on P209 Common Cold I think most of us have the experience of suffering from the mon cold. It is caused by viruses. Sneezing, scratchy throat, runny nose usually are the first signs of a cold. The mon cold is usually mild, with symptoms lasting 1 to 2 weeks. To protect ourselves, we should try to avoid going to public places often. Cancer We all know that certain changes in our cells can cause cancer. Some kinds of cancer are caused by things people do. Smoking can cause cancers of the lungs, mouth, throat, and several other ans. Radiation can cause cancer. Too much exposure to sunlight without any protection can cause skin cancer. Nowadays, cancer is still a disease that cannot be cured. So we should pay more attention to our life style. AIDS AIDS is caused by the virus HIV. If a person gets AIDS, his or her immune system will be destroyed, and he or she will bee sick, at last, he or she will die. S