【推荐2】You use your eyes to see, animals use their eyes to see, too.

Animal eyes can be small or large. Some animal eyes can look very strange (奇怪的).   

The spider (蜘蛛) has eight eyes that look like little dots (点). Most spiders can’t see very clearly, but many spiders are very good at seeing things move.

The owl’ eyes help it see well at night. An owl cannot move its eyes. It must turn its head to look around.

Each eye of the lizard (蜥蜴) can look in a different place. The left eye sees one thing. The right eye sees something different at the same time.

The dragonfly (蜻蜓) has eyes that are made of(由……组成) many tiny (微小的) eyes. Dragonflies are very good at seeing things move.

Use your eyes to see all the animals around you.

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【推荐3】The best known vegetable in the world is the potato. It grows in many places and does not need rich soil like many other crops. But until four hundred years ago the potato was not known to the Europeans. But today it’s one of the main foods in Europe. About half of the world’s potatoes are grown in Europe.

In France the potato was not grown for a long time. Here is a story about Louis. In 1778 he saw some potato flowers for the first time. He liked them so much that he picked one and put it in his buttonhole. He was interested in the flowers not the potatoes themselves.

【推荐1】The world has many beautiful sounds. We can hear the songs of birds and the laugh of people. We can listen to cool music and news reports. And it’s all because of our ears! They bring us a world of sounds.

But some people can’t hear any sound at all. Some are born deaf. Others can hear well in their childhood, but too many loud sounds hurt their ears later on.

Many people in China can’t hear ordinary sounds clearly. A large number of them are children. Most of them are born with good hearing. But 6 children out of every 1,000 have hearing problems when they are born. And if a child has hearing problems, he or she usually will also have learning problems at school.

A lot of things can cause hearing problems. For example, too much earwax is not good for our hearing. And noise louder than 85 decibels (分贝) can hurt our ears and make us lose our hearing for a short time or even for ever.

Hearing is important for all of us. So we should do our best to give our ears special care. Don’t forget to do the following.

◎Try to stay away from places with too much noise. If you have to go, wear earplugs (耳塞). A pair of good earplug can cut the noise by 30 decibels.

◎When swimming, remember to put earplugs into your ears to stop water from getting in.

◎Never put anything sharp (尖锐的) into your ears. If you think you have too much earwax, ask your mum or dad to help you clean it out.

Keep these things in mind! Then you won’t be saying “WHAT???” when you are older.

【推荐2】Many people know that rubbish is a big problem on the planet Earth. What many people don’t know is that junk（垃圾）has become a problem in outer space too.

According to BBC News, there are more than 22, 000 pieces of space junk floating around the earth. And these are just the things that we can see from the surface of the earth by telescopes （望远镜）. There are also millions of smaller pieces of junk that we can’t see.

Objects, like bits of old space rockets（火箭）or satellites（卫星）, move around the planet at very high speed so fast that even a very small piece can break important satellites or become dangerous to astronauts. If the tiniest piece of junk crashed into a spaceship, it could damage （损害）the space tool.

To make things worse, when two objects in space crash, they break into many smaller pieces. For example, when a U.S. satellite hit an old Russian rocket in 2009, it broke into more than 2,000 pieces, increasing the amount of space junk.

To reduce additional （额外的）space junk, countries have agreed that all new space tools can only stay in space for 25 years at most. Each tool must be built to fall safely into the earth’s atmosphere （大气层）after that time. In the upper parts of the atmosphere, it will burn up.

Many scientists also suggest different ways to clean up space junk. In England, scientists are testing a special net that can be sent into space junk. The net catches the junk and then pulls it into the earth's atmosphere to burn up. The Germans are building robots that can collect pieces of space junk and bring them back to Earth to be safely dealt with.

“The problem is becoming more challenging because we’re sending more objects into space to help people use their mobile phones and computers,” says Marco Castronuovo, an Italian space researcher.