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.”

    Even nowadays there are a lot of misunderstandings between nationalities. Let's have a look at what the following people have to say.

Maria Conti: I find the English people insincere (虚伪), cold and unfriendly. They keep saying "Thank you", "I'm sorry", even when they don't know each other. They are even polite to their own relatives! Except for helping you find your way in the streets, they aren't really friendly and never invite you to their houses.

Giannis Sinios: On the contrary I found them both broad-minded and friendly. I was invited to people's houses and they all showed great interest in my ideas, Greek life and people. In England I learned that it was possible to be warm, friendly and polite at the same time.

Judy Brown: I lived in both Italy and Greece for a few years. At first there were a few misunderstandings between my foreign friends and myself. For example, I once gave a Greek friend a present for her birthday. I was rather sorry that she didn't unwrap it immediately. What's more, she even didn't thank me until I asked her if she liked it! I've learned from different experiences that a lot of foreigners find our attitude to what we English people call politeness is rather insincere. They feel that politeness isn't necessary between friends.

    The idea of an Olympic mascot was officially approved (官方批准) at the 73rd Session of the International Olympic Committee (国际奥委会) in Munich (慕尼黑) in 1972. Since then, mascots have become a major element (元素) of the Olympic brand. Mascots act as a vehicle for communicating the Olympic spirit to the general public, especially children and youth. They have come in many shapes and sizes. They all show the theme (主题) of the Olympic Games and the special geographical features, history and culture of the host city.

    Here is the list of some mascots for the Olympics.