Do you clean your school desks every day? If not, then maybe it's about the time for you to get started. Keyboards, computer mice and telephone dials are infected (polluted) with lots of germs(细菌), according to scientists from the University of Arizona, the US.

    The study suggests that office equipment should be regularly cleaned. “Desks are in fact germs' cafeterias(自助餐厅),” said Charles Garbage, a biologist who took part in the study. “They are breakfast bars, lunch tables and everything else.” The desks at your school are probably not different.

    The scientists found that telephones in workplaces have almost 4,000 germs/cm², keyboards 500 and computer mice around 250. The office as a whole contains 4, 750germs/cm².

    When some people catch a cold or flu, they leave germs on the surfaces(表面) they touch during the day. Some flu germs can live on the surface for up to 72 hours, so the germs can easily move to other people. If you're ever wondered why everyone catches the germs when only one student has a cold, now you know the answer.

    Experts in the US last month warned about the spread(传播) of the germs during flu seasons. They reminded Americans to cover their noses and mouths while sneezing, often wash their hands and clean their office desks.

Hand washing is the most important. Killing germs during hand washing is useful only if you clean carefully with soap and water for at least 30 seconds. You should pay close attention to cleaning your thumbs, fingertips and fingernails.

    The world itself is becoming much smaller by using modern traffic and modern communication means. Life today is much easier than it was hundreds of years ago, but it has brought new problems. One of the biggest problems is pollution. To pollute means to make things dirty.{#blank#}1{#/blank#}We see it, smell it, drink it and even hear it. Man has been polluting the earth. {#blank#}2{#/blank#}Many years ago, the problem was not so serious because there were not so many people. When the land was used up or the river was dirty in one place, man moved to an-other place. But this is no longer true. Man is now slowly polluting the whole world. Air pollution is still the most serious. {#blank#}3{#/blank#}Water pollution kills our fish and pollutes our drinking water. Noise pollution makes us angry more easily.

    {#blank#}4{#/blank#}They stop people from burning coal in houses and factories in the city, and from putting dirty smoke into the air. Pollution by SO, is now the most dangerous kind of air pollution. It is caused by heavy traffic. We are sure that if there are fewer people driving, there will be less air pollution. The earth is our home. We must take care of it. {#blank#}5{#/blank#}And we must take care of the rise in pollution at the same time.

    There is a very beautiful bird and she lives in a tall tree in the mountain. Every morning she gets up very early and sings.{#blank#}1{#/blank#}So when she sings, many animals come to listen to her. When she sings happily, you can get pearls(珍珠) from her.

    A man knows that and he has an idea.{#blank#}2{#/blank#}After a few days, he finds her and gels her, then he takes her home.{#blank#}3{#/blank#}The man thinks a lot of ways to let her sing. But it doesn't work

    At last, he takes the bird to the king(国王).{#blank#}4{#/blank#}The princess(公主) is a beautiful girl.{#blank#}5{#/blank#}The bird is very happy and sings for the princess. And the princess gets lots of nice pearls.

    From that day, the bird comes to meet the princess every day and sings for her.

A. She sings very well

B. She is very kind and lets the bird fly away.

C. Because she is good at singing.

D. But the bird is very sad, and she doesn't sing at all.

E. One day, he goes into the mountain and looks for her.

F. The king is very happy and gives the bird to his daughter for her birthday.

G. The bird is happy and sings for the man.

    Everyone wants to become perfect. Unluckily, being perfect may not happen. Here's some useful advice about how to refuse perfection.

{#blank#}1{#/blank#}

    Compared(比较) with others, you may feel that you are not perfect. The solution? End your comparison.

{#blank#}2{#/blank#}

    When perfection is your goal, mistakes mean failure. Your fear of criticism(批评) may keep you from taking risks or trying new things. Nobody is perfect. Take it easy. You needn't take others' words seriously.

{#blank#}3{#/blank#}

    Part of beating perfection is accepting that mistakes are part of human beings. If you don't give up, you will be successful one day. You shouldn't prevent you from asking for help.

{#blank#}4{#/blank#}

    Find a trusted friend, family member or teacher who is not a perfectionist- someone who can take criticism and has learned from his or her mistakes. Share your goals and achievements with him or her, no matter how small they are.

{#blank#}5{#/blank#}

    Cut out the words like never, always and should from your self-talk. Carry a notebook and take notes whenever you want to say these words. Realizing this means you're well on your way to changing them. The more confidence(自信) you develop, the less you'll feel the need to be perfect. And when you give up perfection, happiness can begin right now.

    Scientists are trying to make the deserts into good land again. They want to bring water to the deserts, so people can live and grow food. They are learning a lot about the deserts. But more and more of the earth is becoming deserts all the time. Scientists may not be able to change the deserts. People are doing bad things to the earth.

    Some places on the earth don't get much rain. But they still don't become deserts. This is because some green plants are growing there. Small green plants and grass are very helpful to dry places. Plants don't let the hot sun make the earth even drier. Plants don't let the wind blow the earth away. When a little bit of rain falls, the plants hold the water. Without the plants, the land can become a desert much more easily.