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.”

    A Bite of China, the seven-part documentary (纪录片) introduces Chinese food through the geography, history and culture.

A Bite of China is fill of &eat pictures of food, from expensive food to local food. The documentary shows Chinese food culture and how to make the delicious food.

    How to make dishes is only one part of food culture. The program tries to bring something new by showing more cultural elements (元素) about dishes, such as eating habits, and people's life. For example, one part tells China's history of rice growing. It explains why rice is the main food of the southern Chinese, while the northern ones mainly eat wheat flour (面粉).

    And a part about pickles(腌制食品) tells about a woman in Beijing. She returns to her hometown in Jilin and makes pickles for the first time for her lonely mother.

Another part shows happy moments of sons and daughters making New Year cakes after they return home from different cities to celebrate with their lonely parents in Zhejiang.

A Bite of China also shows social changes when showing food culture. For example, some members of a family work outside but leave the old in their hometowns - in this case, food can make people remember the happy time.

    The Double Ninth Festival

    The Double Ninth Festival, also named the “Chong Yang Festival”, is celebrated on the ninth day of the ninth month of the Chinese lunar calendar.

    The festival began as early as the Warring States Period (475-221 BC). In ancient time, numbers were mysterious and were divided into yin and yang. Yin means something of darkness and yang means life and brightness. The number nine is regarded as yang. The ninth day of the ninth month is a double yang day, so it is called “Chong Yang Festival”. (Chong means “repeat” in Chinese)

    People always climb mountains and drink chrysanthemum wine on the Double Ninth Festival. It is hard to say when the customs were created. But there are many stories which are closely related. As recorded in a historical book of the sixth century, in ancient times, there lived a man named Huang Jing. He was learning the magic arts from Fei Changfang. One day, they were climbing a mountain. Fei Changfang suddenly stopped and looked very upset. He said to Huang Jing, “On the ninth day of the ninth lunar month, a big trouble will come to your hometown”. You must go home immediately. Remember to make a red bag for each one of your family members and leave home quickly and climb to the top of a mountain. Most importantly, you must all drink some chrysanthemum wine. Only by doing so can your family members avoid the big trouble.

    On hearing this, Huang Jing rushed home and asked his family to do exactly as his teacher said. The whole family climbed a nearby mountain and did not return until the evening. When they got back home, they found all their animals dead, including chickens, sheep, dogs and so on.

    Since then, climbing a mountain and drinking chrysanthemum wine became the traditional activities of the Double Ninth Festival, to avoid evil spirits and bad luck. Nowadays, the Double Ninth Festival is also a time for family get-togethers to do some exercise as well as enjoy the autumn scenery.

    Birthdays are celebrated all over the world. Some traditions are rather similar from one country to another: candles, cakes and birthday wishes. But there are also different ways to celebrate birthdays.

    Here are a few:

    Argentina (阿根廷): In Argentina, as in many Latin American countries, one of the most important birthday parties is a girl's fifteenth. When girls turn 15, they have a huge party and dance first with their fathers, and then the boys at the part.

    China: The birthday child receives presents from the parents. Friends and family members are invited to dinner, and noodles are served to wish the birthday child a long life.

    Denmark (丹麦): A flag is flown outside a window to show that someone who lives in that house is celebrating the birthday. Presents are placed around the child's bed while he is sleeping so he can see them immediately when he wakes up.

    Holland (荷兰): The birthday child receives an especially large present. The family also put flowers or balloons on the birthday child's chair to make it beautiful.

    India: Usually Indian children wear white to school. However, the birthday child wears colored clothes to school and gives out chocolates to everyone in the class. His /Her best friend helps do this.

    Japan: The birthday child wears new clothes to mark the special time. Certain birthdays are more important than others and these are celebrated with a visit to the shrine (神殿). These are the third and seventh birthdays for girls and the fifth for boys.

    Water is the1of all the things we eat and drink. Not many people understand this but2quite true. The human body3go without food for a long time. We've got many examples for this. Yet two4three days without water can usually make people5. Man can't live6water.

    Many people don't understand how7water the human body needs8work well, and many people, especially young people, do not drink enough,9in very hot weather. Our body is mostly water, about 65% to 75%. That is to say about two thirds of our body is water. When we do sports, some of the water will get away from our body.10we don't drink some water, we won't have enough water. If we don't have enough water, we'll feel tired and many of us will get ill. So you know how important water is to us.