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)”. Using it，students can receive calls and text messages (短信) in class but the teacher will not realize what is happening. How?
   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 it's_inaudible_to someone 20 or older.
   But sometimes，people over 20 can hear the ringtone. One British student's phone uses mosquitotone. In class，the student's phone rang. The 32­year­old 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 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. Yon'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 on their study if students use it in class.”

Bicycling helps to control your weight.
A 15-minute bike ride to and from work three times a week burns off five kilos of fat in a year.
 Bicycling can improve your mood (心情).
Exercise like bicycling has been shown to make people feel better, more relaxed and self-confident.
Bicycling is healthier than driving.

    Tea is an important part of Chinese tradition. Tea has very close relationship to Chinese culture.

It is said that Chinese tea was discovered by King Shen Nong. People say that he lived 5,000 years ago. One summer day, while he was visiting a faraway part of his country, he felt very thirsty. The servants began to make water hot enough to turn into gas for him to drink. Dried leaves from a near plant fell into the water. The king drank some, and found it could make him feel less tried. Also as a scientist, Shen Nong was interested in the new dink. And so, tea was created in 2737 BC.

    Drinking tea has many advantages. It makes people feel less tired, clears heat inside the human body and helps people lose weight. As you add a cup of tea to your daily life, please check the following helpful advice.

    Drink it hot. Tea oxidizes(氧化) quickly, so it is suggested that you drink it hot.

    Do not drink too much strong tea. It will probably be harmful to your stomach and make you feel sick if you make the tea too strong.

    The best time to drink tea is between meals. It may not make you have a strong wish to eat when your stomach is full.

Do not drink with medicine. It many change the medical result. You can drink tea two hours after you take medicine.

    Green tea is the best choice for office workers. Why? Because green tea helps stop the bad result of the computer.

    Americans usually eat three meals a day. Breakfast usually comes before eight o'clock in the morning. They usually have eggs, some meat, bread, fruit juice and coffee. Lunch is between twelve and one o'clock. It is like a light meal and working people must take lunch with them or get it near workplace.

    Children in school take sandwiches, fruit and cookies with them or eat in school. Supper, the main meal, is between six and eight in the evening. People cook it carefully. They may have meat or chicken, turkey and duck. They may all have potatoes or rice, vegetables or salad. The drink is coffee, tea or milk. Then comes the dessert.

    Hi, my name is Murray Wenzel. But my friends call me Muz, Muzza, Wenz or even Moon. Yes, I have lots of nicknames. But in Australia, where I am from, that's quite common.

    In fact most men in Australia call their friends something other than their real name. It is part of our culture to shorten or make up names for those we know and love. For example, one of my friend's names is Alex, but we call him Al. Another is named Jayson, but everyone knows him as Jase. In Australia most men called William are known as Bill, while Jeremy is Jez, James is Jim and Joseph is Joey.

    Sometimes we use the person's surname in their nickname, like my friend Karl Schussig who we call Schuzza. Sometimes we combine them, like my friend Troy Cassels being called TC. And we sometimes make up a new name for our friends. My friend Nathan's nickname is “Prez”, because when we first met he joked that I should call him “El President”.

    Even more confusing is when we are given ironic(讽刺的) nicknames. For example, a man with red hair will be known as Bluey, a tall man will be called Shorty or a large man will be known as Slim.

    Most of my friends call me Muz, but those who I play hockey(曲棍球) with call me Moon. However, my parents still call me Murray.

    So, I have different names depending on who I am talking to. Nicknames are so popular that sometimes people forget what the person's real name is.

    I think it is our way of showing affection to those we are close to.

    I often dreamed about Pisa when I was a boy. I read about the famous building called the Leaning Tower of Pisa. But when I read the word Pisa, I was thinking of pizza. I thought this tower was a place to buy pizza. It must be the best place to buy pizza in the world, I thought.

    Many years later I finally saw the Leaning Tower of Pisa. I then knew that it was Pisa and not pizza. But there was still something special about it for me. The tower got its name because it really did lean to one side. Some people want to try to fix it. They are afraid it may fall down and they don't want it to lean over the city.

    I do not think it's a good idea to try to fix it. The tower probably will not fall down. It is 600 years old. Why should anything happen to it now? And, if you ask me, I like what it looks like. Nothing is perfect. It seems to say.

    And who cares? Why do people want things to be perfect? Imperfect things may be more interesting. Let's take the tower in Pisa. Why is it so famous? There are many other older, more beautiful towers in Italy. But the Leaning Tower of Pisa is the most famous. People come from all over the world to see it.