（1）Everyone knows what happens when you catch a cold. First you get a sore (疼痛的) throat. Then you sneeze (打嚏). After coughing and blowing your way through the next few days, it's over… until the next time.（2）Every year 69% of Canadians will suffer at least one cold. Colds are responsible for a great deal of lost time at work and at school.（3）There is no known cure for the common cold. Once you catch a cold, your body usually makes antibodies (抗体) against the virus. These antibodies help the body develop a resistance (抵抗力) to the virus if you catch it again. Unfortunately, the common cold is caused by over 200 different viruses. The large number of viruses and the fact that they change help explain why there is no cure for the common cold. Adults, who have been exposed (遭受) to more viruses, tend to suffer fewer colds than children.（4）The occurrence of colds tends to increase in the winter but NOT because of the cold! Cold weather has not been shown to increase the number of colds. People spend mo