We live in computer age(时代). People 1 scientists, teachers, writers and even students use computers to do all kinds of work. But more than 30 years ago. 2 couldn't do much. They were very big and expensive. Very few people were 3 in them and knew how 4 them. Today computers are smaller and 5. But they can do a lot of work. Many people like to use them.

    Computers become very important because they can work 6 than people and make fewer mistakes. Computers can 7 people do a lot of work. Writers now use computers to 8. Teachers use them to help teaching. Students use them to 9. Computers can also remember what you 10 them. Computers are very useful and helpful. They are our friends. Do you want to have a computer?

    We may learn from the news that the world is hungry. Many people in poor areas don't have enough food to eat. In fact, our world is also 1. We are still short of water though water 2 nearly 3/4 of the Earth. About 97% of water on the Earth is seawater and we can't drink it or use it to water plants 3 . People can only drink anti use the 3% of the water from rivers and lakes. What's worse, we can't use all of that because of water 4 .

    Now we are facing a serious problem-we need more water. First, we need to learn how to save water. Then we need to 5 ways to reuse water. Scientists have made a lot of studies. The 6 show that in many large cities and small villages, people 7 use water only once and then it runs to the sea or rivers. So we can reuse water. Last but not least, we should make full use of the seawater. Scientists are trying to solve the 8 —collecting clean water from seawater 9 we can do now is to save water and not to waste water. We cannot live long 10 enough clean water. So let's work together to do something.

    Red squirrels were common (常见的) in British forests and countryside. But there are1than 140,000 red squirrels left now and most of them are in Scotland. However, grey squirrels are now so common that many people2them. They can hunt and kill them legally (合法的).

    The two types of squirrels look similar. They both have a long3, which helps the squirrel to jump from tree to tree, and the same large eyes, small ears and powerful back legs.4, the grey squirrel has a clear advantage (优势) over the red. The red squirrel has a head—and—body length of 19 to 23 cm and a tail length of 15 to 20 cm. But the grey squirrel is a5animal. The head—and—body length is between 23 and 30 cm. This6allows (允许) them to store more fat and7them to live in a hard winter.

    So why is the number of red squirrels smaller than that of grey squirrels? Size is one reason, but there are others. Red squirrels live high up in8, while grey squirrels spend more of their time on the ground. This means the missing of forests greatly influences the red squirrel's population. Another reason for the grey squirrel's success (成功) is its9to get food easily from people. Like the fox, the grey squirrel10live in towns and cities. The other problem for the red squirrel is illness, it is fatal (致命的) to them.

    We all know that the panda is the treasure (珍宝) of our country. Then how about its droppings (粪便)? They are treasure, too. How?

    The panda keeper1an adult panda with about 25 kilos of bamboo every day. Of that, the panda will eat about 11 kilos — the most2parts. Because the panda cannot digest (消化) all the bamboo completely, its droppings3much of undigested (未消化的) bamboo. Can people make use of it? Sure, someone4in turning it into toilet paper.

    "In my opinion, it's a great5 ， " a panda keeper says. "In the past, we just threw away the droppings6rubbish. But now workers come and take the droppings away. They use the droppings to make7. They also make notebooks and bookmarks. "

    8 ， the paper doesn't sell well at the Panda Base. It is not popular with9. Most of them won't buy it after they visit the Panda Base. "A box of tissues (纸巾) is 43 yuan ， " they said. "That's quite10. " If you see the tissues at the Panda Base, will you buy them?

    Many of us enjoy watching animals in the world. But do you know they can teach us?

    Geese(大雁), for example, teach a very good lesson about1  In the fall, Canada geese fly to the warm south to 2 Canada's cold winter. They lift off in no order. Yet3 they form a V shape, with one bird leading the group.

    This V shape allows geese to 4 energy(能量). When the front bird moves its wings up and down, the resulting force of the air lifts the next one. This continues down the line. The bird 5has the hardest job. When it gets 6 , it moves behind, and another bird moves into the lead. By sharing the role, the group can travel great distances (距离). Geese flying in a V shape can fly 70 percent farther without 7 than birds flying alone. During the long flying travel, geese communicate with one another. They honk(鸣叫)to 8 the birds up front to keep up the speed I (速度). They also ,cheer each other up 9working toward a common goal (目标).

    What have we learned from the lovely geese's experience and skills?10 together! Whether it is our personal lives or our jobs, we need other people. We need the spirit of teamwork!