Most of us have three meals a day .We take food for granted(想当然)。And we don't think about it. 1 experts argue a food crisis(危机)is coming.This crisis is going to make us 2 the way we think about food.

 Food is in great need 3a growing of world population.By 1960,the population was three billion.It doubled to six billion by 1999.By 2050,this planet will need to  4 at least nine billion people.As a result,the food prices get higher and higher.

 So,what can a   5 ,crowed world do?One suggestion is to eat less meat.Meat uses more natural resources(资源)than grains(谷物) .It requires more  6  to produce one pound of meat than to produce one pound of grain. It also requires between 5 and 10 times more water than vegetables. So ,eating less meat will  7  more land for farming,and it will save water.

 To eat less meat,people will need to change their eating habits. That will not be easy. Americans, for example,have 8 loved meat.  In general, They eat twice as much meat as people in other countries.At the same time,in developing countries like China and Brazil,sales of meat have doubled in the last 20 years.   9  will double again by 2050.Growing need of meat wil continue to put pressure on natural resources.

 World  population is increasing,resources are becoming fewer,and food prices are rising.Therefore, we need to rethink what  we eat every day. For meat lovers, we don't  need to give up meat  10 .But we need to eat more grains and less meat.

    The computer is fast, and never makes a mistake, while people are too 1 and full of mistakes sometimes. That's what people often say when they talk about computers. For over a quarter of a century, scientists have been 2 better and better computers. Now a computer can do a lot of everyday 3 wonderfully. It is 4 used in factories, hospitals, post offices and airports. A computer can report, decide and control in almost every field. Many computer scientists are thinking of making the computer “think” like a man. With the 5 of a person, a computer can draw pictures, write music, talk with people, 6 chess, recognize voices, translate languages and so on. Perhaps computers will one day really think and feel. Do you think the people will be 7 when they find that the computer is too clever to listen to and serve the people? No, people will make 8 use of the computers in the future. Man is always the master of the computer. The computer 9 only with the help of man. It cannot take the 10 of man.

    Four students are talking about the future after class.

    “In 2050, our life will be much1than it is now. The sky is bluer and water is clearer. We can2the fresh air every day. Humans and animals3the world peacefully. ” says Zhang Tao, full of hope.

    Wang Yan thinks that it is not a4to travel to the moon for a holiday. We eat healthy food every day. At that time, everyone will enjoy a5life.

    Li Yuan Yuan believes that people will have more free time because robots (机器人) will be very popular and will do many things6people. And we will build new7on other planets (星球). Maybe we can chat with each other in our new homes.

    Zhao Kai thinks that no animals will die out because of cloning (克隆). There will8no pollution (污染). The whole world will be one big9. As time10, we'll live a much easier and better life.

    Their teacher Mr. Chen tells them to work hard for their dreams and future. “Nothing is impossible. ” says Mr. Chen.

    Traveling is very interesting. Many people love traveling. There are many ways to travel: by plane, by train, by ship or by car. Everyone has their favorite way.

Greg:

    My favorite way of traveling is by car. I can bring my pet dog along. I can travel three hundred miles or only fifty miles a day. I can stop at a good restaurant to enjoy a good meal or at a hotel to spend the night.

Eliza:

I love traveling by train best! It's very exciting. I traveled most of Europe in 5 months by train. It's the best way to talk with the local people and make new friends on the way. Trains make even the longest trip enjoyable. The train ride to me is just like a big moving party.

    I also like traveling by ship. It is a very great way to spend a vacation. I can go to parties and movies on the ship, and enjoy the blue sky and water.

Danny:

    Planes are my favorite. It's the fastest way of traveling. I can quickly get to another country. Planes have very comfortable seats. I can have something to drink and to eat. I can also read some free magazines and newspapers.

    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!