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. ”

    On April 2, we said goodbye to Tiangong I, China's first space lab. According to the China Manned Space Agency (中国载人航天), Tiangong I re-entered the Earth's atmosphere (大气层) and some of its debris (碎片) fell into the South Pacific Ocean.

    There are many spacecraft (宇宙飞船) that are still in orbit(轨道) above the Earth. After finishing their trips, they will all re-enter the Earth's atmosphere like Tiangong I.

    There are two types of re-entries: controlled re-entry and uncontrolled re-entry.

    Some satellites and manned spacecraft come back to the Earth in a controlled re-entry. Experts calculate (计算) the path of the falling spacecraft and its speed. Thy can guide the spacecraft to fall in a chosen area.

    Some spacecraft may have problems while in space after a certain amount of time. These spacecraft come back in an uncontrolled re-entry. It is hard to tell when and where these spacecraft will fall until the last few hours. The US space station Skylab came back partially uncontrolled in 1979. Parts of the station fell in western Australia, but no one was hurt.

    During re-entry, most of the spacecraft will burn up while passing through the Earth's atmosphere. Only a small amount of the debris will reach the ground. The debris typically ends up falling into the ocean, China Daily reported.

    A computer program that could help catch and ever translates from aliens in outer space has been started by a British scientist.

    If aliens are discovered one day, scientists fear their language may make it possible to understand them. But John Elliott of needs Metropolitan University in Britain has come up with a program that can figure out the structure(结构)of their language. He thinks that's the first step in understanding what they are saying.

    Dr. Elliott's program would compare an alien language to a database (数据库)of 60 different languages in the world to look for a similar structure. He believes that even an alien language will have its own structure. Language has to be structured in a certain way, or it will be harder to use, he told New Scientist magazine.

    Research had shown that it is possible to know if a signal(信号)carries a language rather than a picture or music. Dr. Elliott has gone a step further by finding a way to pick out what might be words and sentences. Because languages have different word orders, Dr. Elliott has set up a library of the sentence structures of 60 human languages.

    If a message is received from outer space, it could be compared against this database. Scientist would then be able to see if ti's similar to any human language, or a mix of the language.

    However, Dr. Elliott also said that in order to translate what the aliens are actually saying, it may still be necessary to have a code book.

Many parents want to let their kids enjoy themselves when they're still young. Others may think children can't finish the {#blank#}1{#/blank#} as well as possible. They seem to be right, but they don't realize the {#blank#}2{#/blank#} of giving kids chores. There are several reasons for doing chores for {#blank#}3{#/blank#} .

Chores help {#blank#}4{#/blank#} life skills（技能）. They're young now, but when they grow up, they need to do washing, cooking and cleaning. They can't learn them at school. {#blank#}5{#/blank#} these skills at home is important.

Chores help kids learn to be {#blank#}6{#/blank#}. Cleaning their rooms or washing their clothes can make them less dependent on others. They will think they can take care of themselves.

Chores help teach them to respect（尊重）others. They often can't realize what their parents do around the house until they move away from home. They may realize the mess of their rooms by {#blank#}7{#/blank#} housework themselves, so they can respect their {#blank#}8{#/blank#} work at home.

Chores help improve planning skills. It feels like there are a lot of things to do in a day. How to spend time on them? Chores can help older kids build good habits {#blank#}9{#/blank#}. They learn to {#blank#}10{#/blank#} their time in a right way. It is also an important skill for them in the future.

A Guide to Have More Fun

When is the last time you had fun? Felt truly happy? If you're making efforts not to be bored in your life, we'll offer you expert advice on how to have more fun.

{#blank#}1{#/blank#}You may not be having as much as you want because you feel like you're doing the same old thing day after day. Try something new. It will not only provide something to look forward to in your daily life, but it will also make you more open to new ideas.

{#blank#}2{#/blank#}It can improve your energy levels and make you feel more capable of handling your responsibilities by going to bed and waking up around the same time every day. 

{#blank#}3{#/blank#} Experts suggest that music helps reduce stress* and improves your feelings. Every time you feel stressed, turn on a song you like to reduce your stress. By doing so, you'll make it a part of your daily activities which will improve your feelings.

{#blank#}4{#/blank#} It is great for your mental health. Get a change of scene and try to improve your relationships with the people you travel with. Travel doesn't have to be big or expensive either. It can be as simple as taking a road trip just a few hours away.

{#blank#}5{#/blank#} You won't seriously influence your productivity if you take the time to enjoy a little game once in a while. Even just playing with silly putty while you're at your desk will make your study day a little more enjoyable.

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参考词汇: understand (理解), have a quarrel with…(与…吵架), feelings and thoughts(感受和想法)