MMany people catch colds in the springtime or fall. It makes us wonder: If scientists can send a man to the moon, why can’t they find a cure (有效疗法) for the common cold? Actually, there are hundreds of kinds of cold viruses (病毒) out there. It is hard to know which one you will get, so there isn’t a cure for each one. When a virus attacks (攻击) you, your body works hard to get rid of it. Blood rushes to your nose and causes congestion (堵塞). You feel bad because you can’t breathe well, but your body is actually “eating” the virus. Your