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Tiny Invaders
The human body is truly amazing. It allows us to sense the world around us, to do work and have fun, and to move from place to place. In fact, the human body does its work so well that most people don’t think about it very much -- until they get sick.
The germs(致病菌)that make people sick are everywhere. You can’t see them, but they’re there. They’re sitting on your desk. They’re hiding on your computer’s keyboard. They’re even in the air that you are breathing. There are two types of germs: viruses and bacteria(细菌).Viruses are germs that can only live inside animals or plants. Viruses cause illnesses such as flu and measles(麻疹).Bacteria are tiny creatures. Some bacteria are good. They can help your stomach break down food. Other bacteria aren’t so good. They can-make you sick. Bacteria can cause sore throats(喉痛)and ear infections.
How can you stop these tiny invaders from making you sick? Your skin is the first defense against germs. You can prevent some illnesses simply by washing, with soap and water. But germs can still enter the body through small cuts in the skin or through the mouth, eyes, and nose.