All over the world people swim for fun. Swimming is enjoyed by people of 1 ages, from the very young to the very old. There are many places for people to swim in swimming pools. Many schools, hotels and clubs have swimming pools. Some people have pools of 2 in their yards.
Swimming is one of 3 forms of exercise. It can 4 hearts and bodies strong. It can also help blood circulate(循环). Handicapped(残疾的)people can keep their bodies in better condition by swimming 5 they can't enjoy sports.
 6  is a good idea for parents to see to it(务必做到) that their children learn to swim 7 an early age. So their children will 8 it for the rest of their lives.
There are many rules for water safety. These rules can help save not only your life 9 the life of a friend. First of all, know 10 . Many schools 11  swimming lessons to children. Adults(成人) can learn to swim at public pools.  12  rule to remember is never to swim  13 . Always swim with a friend and know  14  in the water at all times. It is best to swim  15  in safe places if you are beginners. If every one learned to swim and obeyed the rules for water safety, most drawing(溺水) could be avoided.  

A man was walking along the street when he saw a woman struggle（奋力）with a large box. It was half in and half  1  of her car. He was a helpful man, so he went up to the woman and said, “Let me give you a hand with that box. It looks very   2 . ” “That’s very kind of you,” the woman said. “I’m having a lot of  3  with it. I think it’s stuck（卡住）. ” “Together we’ll soon move it,” the man said. He  4_  into the back seat of the car and took hold of the other end of the box. He said, “I’m ready. ” And he began to_ 5  hard. For several minutes the man and the woman struggled with the box. Soon they were  6  in the face. “Let’s rest for a minute,” the man said. “I’m sorry, but it  7  stuck. ” A few minutes later, the man said, “Let’s try again. Are you ready?”  8  of them took hold of the box again. “One, two, three!” the man said, and they went on with their struggle.
At last, when they were very tired, the man said, “You are  9 . It really is stuck. I don’t think there’s any way we can get it out of the car. ” “Get it out of the car!” The woman cried. “I’m trying to get it  10 !”

All living things on the earth need other living things to live. Nothing lives alone. Most animals must live in a group, and even a plant grows close together with others of the same kind. Sometimes one living thing kills another, one eats and the other is eaten. Each kind of life eats another kind of life in order to live, and together they create a food chain (链条). Some food chains are simple, while others are not. But all food chains begin with the sun, and all food chains become broken up if one of the links (链接) disappears.
All life needs sunlight to live on. But only plants can use sunlight directly. Plants are ‘factories’. They make food from sunlight, water and things in the soil (土壤) and air. Plants feed all other living things. Animals can only use the sun’s energy after it has been changed into food by plants. Some animals feed directly on plants, others eat smaller animals. Meat-eating animals are only eating plants indirectly.
What about humans? We are members of many food chains. We eat rice, vegetables, and fruits and so on. We also eat meat and drink milk. But we often break up the food chains. We kill wild animals and also make rivers, lakes and seas polluted. When these rivers, lakes and seas are polluted, the fish in them can not be eaten. If we eat the fish, we will get strange illnesses.
Each form of life is linked (关联的) to all others. Breaking the links puts all life in danger.
【小题1】Which living things can use the sun’s energy directly?