Air pollution(污染) is a big problem. It's bad for all 1 things on Earth，and it is not the only one kind of 2.Water pollution makes fishand pollutes our drinking water. Noise pollution makes us get3more easily.

Many countries are making rules(规定) to fight against pollution. They try to stop people 4 burning coal(煤)in the city and releasing(排放) dirty smoke into the5.And if people use 6fewer cars，the air will get 7.

    8earth is our home. We must protect it and not destroy it. That is to say, we should keep the land, water and air 9.At the same time, we had better plant more trees10they can provide a lot of things for us and make our earth beautiful.

    Soon computers and other machines will be able to remember you by looking at your eyes! The program works because everyone's eyes are different. So in the future you won't have to remember a number when you want to use a machine or take money out of a bank. You'll just have to look at the machine and it will be able to tell who you are.

    The eye-recognition(眼睛识别) program has already been tested in shops and banks in the USA, Britain, Spain, Italy and Turkey. Soon this technology will take the place of(取代)all other ways of finding out who people are.

    Eye-recognition is a course of recognizing iris(虹膜), which includes the following steps. First, a kind of machine needs to collect different examples of one's iris from his eyes and store them. Second, when this person goes to the bank to take out of money, this machine will have iris feature extraction(采集).Then, this machine will compare the examples kept in it with iris feature extraction. Once the examples and the feature extraction are the same, this person will be identified, and he will take out of the money from the bank successfully.

    However, scientists are also working on other systems. Machines will soon be able to know you from the shape of your face or hand or even your smell! We already have machines that can tell who you are from your voice or the mark made by your finger.

    Eye-recognition is better than other kinds because your eyes don't change as you get older, and don't get dirty like hands or fingers, and even twins have different eyes. So the eye-recognition program can be up to 94% correct, depending on how good the technology(科技)is. However, some other programs may only be 51% correct now. In Britain, it was found that 91% of people who had tried it said that they liked the idea of eye-recognition.

    In the future your computer will be looking at you in the eye. So smile!

    As we know, there are four seasons in a year. When spring 1, it's getting warmer and warmer. Everything comes back to life. Trees turn 2. There are beautiful flowers and grass here and there. Children can 3 kites in the sky. 4 summer, the weather becomes hot. 5 people can take part in more activities outside, such as running in the morning, taking a walk in the evening, going camping, 6 in the river, travelling with family, and so on. 7 comes after summer. It's a harvest season. We can taste 8 of fresh fruits. The weather is neither too hot nor too cold. People feel comfortable. It usually snows in winter in my home town. Snowing 9 me excited. Children are 10 in making snowmen outside. A heavy snow will predict a good year. The four seasons bring us happiness and pleasure. We should love and treasure (珍惜) them.

The first astronauts

    Since the earliest times, people have looked up at the stars, the moon and the planets. Today people use modern machines 1at the sky. This is very different from the situation2years ago when people could only use their eyes. Perhaps they dreamed of3the universe.

    When did humans first go into space? The story began not so very long ago, 4the first astronauts were not people-they were animals.

Scientists wanted to make travelling to space as 5 as possible for humans. So they decided to experiment with animals and test6 in spaceflights. Insects, mice, frogs, dogs and monkeys were some of the animals7first went into space. Many of them 8, but they helped to make space travel safer for humans. For their great service, we 9forget these animals.

    Albert Ⅱ was the first monkey to go into space in 1949. Sadly he died 10 his spaceship landed back on Earth.

    11 the result was different for Ham the Monkey. His story ended happily when he return to earth12very good health.

Scientists wanted to know the answer to the important question: could 13 animal like Ham do the same things in space as he could do on Earth? The answer came when Ham 14 into space in 1961. Yes, he did everything well and lived for 15 16 years