Spiders are not insects as many people believe. They belong to a class of animals called arachnids(蛛形纲动物). Spiders have eight eyes, four pairs of legs, and can grow a new leg if they lose one. A spider's body is divided into two sections: the abdomen(腹部) and the thorax(胸部).The legs, eyes, and mouthparts are in the thorax section.

    Most spiders have poison glands(毒腺)and sharp teeth. They use their sharp teeth to force poison into the insects they catch for food. This poison can make an insect lose the ability to move, and the helpless insect is then devoured by the spider.

    Spiders usually have silk glands under their abdomen. They produce a liquid(液体)that is thicker than water from their glands. When the liquid comes into the air, it dries into silk. Many spiders use this silk to form webs to catch insects and to make cocoons(茧)that protect their eggs. This amazing silk is also used to create lines that spiders hang onto as they travel to new areas.

    Spiders live in almost everywhere on earth. The only places where there are no spiders are the coldest places, the highest mountains and the seas.

    There are all kinds of horses in the world. But one of them you can't ride. It doesn't live on land, but in the sea. Its head looks like the head of a horse .So people call it a "sea horse." In fact, The sea horse is a small fish. It likes to live in warm water. A sea horse always stands up in the water when it swims.

    The mother sea horses give eggs, but they put the eggs inside   father's body to keep them safe in its pouch until they hatch()孵化. When the eggs are hatched after 40 to 50 days, the baby sea horses swim away.

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B

    Gardening is popular in many parts of the world. It brings us sweet smelling flowers, fresh fruit and vegetables. But you can get more from your garden.

    Gardening helps to keep healthy. Today's people sit indoors for too long and don't get much exercise. When you garden, you have to move around. It's a good chance for you to exercise your body by watering flowers or doing some digging. Besides, when you are in your garden, you can feel the warm sunshine. This means you are getting Vitamin D. It helps your bodies use calcium (钙), which is necessary to keep your bones (骨骼) strong.

    It gets them off computers, televisions and phones. Gardening can be a great teacher to teach children about nature and healthy eating. It can also help them to understand the meaning of “No pains, no gains.”

    Gardening is a great way to meet people and build relationships. When you are gardening, you are outdoors. So it is a perfect time to communicate with your neighbors. Most people love to talk about their hobbies, and so do gardeners. They usually enjoy showing people what they are growing. And most enjoy sharing advice and stories about their gardens.

    Sometimes people call each other “scared-cat”, but have you ever thought about this expression? When a cat is frightened, its heart starts beating faster, its muscles get tense (紧张的), and there are changes in the chemicals in its bloodstream. Although the cat doesn't realize this, its body is getting ready for action. If the danger continues, the animal will do one of two things. It will protect itself, or it will run away as fast as it can.

    Something like this also happens to people. When we are excited, angry or scared by other feelings, our bodies go through many physical changes. Our hearts beat faster, and our muscles get tense. All of these changes make us more alert and ready to react. We, too, get ready to defend ourselves or run.

   Human beings, however, have a problem that animals never face. If we give way to our feelings and let them take over, we can get into trouble. Have you ever said something in anger — or hit somebody — and regretted it later? Have you ever shouted at a teacher, told somebody you were lonely, or said you were in love, and then wished later you had kept your mouth shut? It isn't always clever to express your feelings freely.

    Does this mean that it's smarter always to hide (藏) our feelings? No! If you keep feelings of anger, sadness hidden away or bottled up inside, your body stays tense. Physical illness can develop. It can actually be bad for your health. (It isn't good to keep pleasant feelings inside either; all feelings need to be expressed.)

    Feelings that you keep all bottled up inside don't just go away. It's as if you bought some bananas and stuck them in a cupboard. You might not be able to see them, but before long you'd smell them. And if you opened the cupboard, chances are you'd see little fruit flies flying all over them. They'd be rotten (腐烂).

    You can try to treat feelings as if they were bananas in the cupboard. You can hide them and you can pretend they don't exist, but they'll still be around. And at last you'll have to deal with them, just like those bananas.