In many high schools, there are strict rules about using mobile phones. If your phone rings in class, for example, the teacher will be very angry.

    Every mobile phone has a ringtone (铃声). It tells you that someone is calling you. Now, there is a ringtone called “mosquitotone (蚊子铃声)”.

    Mosquitotone has a special sound. Only children and teenagers can hear it. As we get older, we are unable to hear some sounds with high frequencies (频率). As a result, a child or teenager can hear the mosquitotone ringtone, but someone of 20 or older can't.

    But sometimes, people over 20 can hear the ringtone. One British student's phone uses mosquitotone. In class, the student's phone rang. The 22-year-old teacher looked at the student and became unhappy. “I heard that. You know the rule：no mobile phone in class. ”

    Not all the students are interested in mosquitotone. Jerry Jones, a high school student of 17, says, “Using mosquitotone too often is bad for our hearing. I may use it for pleasure, but not in class. It's unfair(不公平的) to the teachers！”

    What do parents think of mosquitotone？“I think it is perfect for places like movie theaters,” says Connie Neeson, 44. “Think about it. You're watching a film and someone's mobile phone rings. Mosquitotone is good because many people don't hear it. However, it also has a bad influence（影响） on their study if students use it in class. ”

    One of the hottest places on Earth is Death Valley. It's a desert valley in North America. The animals in Death Valley don't use technology to keep cool. They have special abilities that help them live there.

    During the day in Death Valley, it gets hotter than 100°F. The kangaroo rat rests all day in a hole in the ground. It covers the hole with grass to keep out the heat. The kangaroo rat comes out at night when it is cooler. This little rat is also very good at saving water. It gets all the water it needs from the food it eats. The Sun makes the desert sand very hot. One snake, called the sidewinder, can solve this problem. When it travels, the sidewinder bends (弯曲) its body into a "W" shape. Then it uses the bottom parts of the "W" like legs and walks sideways (向一侧). That way it touches only a little of the sand at a time, so the hot sand doesn't bum the snake. This strange way of moving is how the sidewinder got its name.

    A lot of water in the desert is too salty for most animals to drink. One kind of fish, the desert pupfish, can live in these salty water because it can drink the salt water.

    There are some easy things you can do to protect the environment and the earth. Choose ideas from the list or come up with a few of your own.

    •Plant flowers, grass or trees.

    •Whenever you visit a park or beach, take away what you bring there—keep rubbish in a bag until you can put it in a dustbin.

    •Turn off the lights and TV sets when you leave the room. This can save a lot of electricity.

    •Turn off the tap when you brush your teeth. You can save some water by not letting it run. Also, use a glass cup instead of a paper cup because this saves paper.

    •Keep the doors and windows closed in winter to keep warm air in.

    •Give your old books and magazines to a library instead of throwing them away.

    •Give your old clothes to poor children you know instead of throwing them away.

    •Use both sides of paper.

    •Stop pouring dirty water into the rivers or lakes nearby.

    •Encourage all your friends to do the same things you do to help protect the earth. You don't have to wait until Earth Day to do these things. Make every day Earth Day. If everyone makes a contribution to protecting the environment, the world will become much more beautiful.

We were going to play against a team from a country school. 

{#blank#}1{#/blank#} the match almost began, they came. They looked {#blank#}2{#/blank#}(bad) than we thought. They were wearing dirty T-shirts and blue jeans and looked {#blank#}3{#/blank#} farm boys. We thought they never saw {#blank#}4{#/blank#} basketball before. We even felt that we {#blank#}5{#/blank#}(need) any practice to play against such a team. It was already so late {#blank#}6{#/blank#} no time could be given to them for a warm-up. The match began. One of our {#blank#}7{#/blank#}(boy) got the ball. And he tried {#blank#}8{#/blank#}(give) it to our forward. But from out of nowhere a boy in a dirty T-shirt caught the ball and he{#blank#}9{#/blank#}(quick) and beautifully shot and got two points. To our surprise, they got another two points in a minute. Soon it was all over. The country team {#blank#}10{#/blank#}(win) the match. Of course we knew that there was still another team better than any good team. 

But the most important lesson we learned this time was: One can't tell a man or a team by the appearance. 

Franz Kafka was a famous writer. He never married and had no children. Once, at the age of 40, when Kafka was walking through a park, he saw a young girl crying. She lost her favourite doll. 

He helped her look for the doll, but they couldn't find it. Kafka told her to meet him there the next day and they would look for it again. 

The next day, when they still didn't find the doll, Kafka gave the girl letter" written" by the doll that said, " Please don't cry. I have gone on a trip to see the world. I'm going to write to you about my adventures. "

Thus(由此) a story that continued to the end of Kafka's life began. 

When they met every time, Kafka read aloud the letters( which he had written, of course) of adventures that the girl found exciting. Finally, Kafka read her a letter in which the doll said it had finally returned to Berlin. Then, he gave her a doll that he had bought. 

" This does not look like my doll at all, " she said. Kafka handed her another letter that said, " It is my trips that have changed me. " The girl took the doll home happily. A year later, Kafka died. 

Many years later, the girl found a letter hidden inside the doll. It said, " Everything you love is very likely to be lost, but in the end, love will return in a different way. "