外研版选修一册第五单元听力练习

Unit 5 Revealing nature

Today, we are going to talk about an amazing habitat for some terrifying-sounding wild animals that most people have never heard about, a habitat very close to you that you know quite well ... your own body.

For example, have you heard of eyelash mites? These are tiny little creatures that live on our eyelashes and eat dead skin cells and oil. Actually, they are so small that you cannot see them with the naked eye. These creatures usually live for less than three weeks, but the females can lay a lot of eggs. While they are most famous for living on our eyelashes, they can live all over our faces. Not everyone has eyelash mites. They are less common with children and young people, but most older people have them. Even though these creatures look and sound awful, they are probably not all that harmful.

Speaking of which, while some bacteria are bad for us, other bacteria help keep us healthy. For example, do you know about armpit bacteria? These are bacteria that live in our armpits and that feed on our oil and sweat. While that sounds terrible, they actually keep funguses from giving us skin infections. Without these little creatures, our skin would be in really bad shape. By the way, it is these bacteria that cause our armpits to smell. So, while it may not seem nice to have smelly armpits, we should be grateful that these bacteria are around.