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 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."

    Drinking water is good for your health. There are some scientific ways of drinking water.

    ⒈It is the best medicine to drink two glasses of water in the morning.

    ⒉Drink clean water.

    ⒊Drink the water that has not been boiled.

Many people think boiled water is safe and good for people's health. In fact, it is not true. The boiling point of water is 100 ℃. By boiling it, most bacteria(细菌) in water can be killed. In the past, the water was less polluted, so boiling was a good way to make clean water. But heavy metals and other dangerous things in today's water are much more terrible than bacteria. Boiling doesn't solve that problem. And boiling water may give us more dangerous things in our glass.

    ⒋Never use soft drinks to take the place of water.

    ⒌Water is also needed in winter.

    ⒍Drink water at the right time.

    1) After getting up in the morning, you have less water in your body, because you weren't drinking for the whole night .So you should drink some water to keep your health after getting up in the morning. That can prevent high blood pressure(血压), cerebral hemorrhage(脑溢血) and so on.

    2) Drinking water at about 10 a. m. helps your body keep enough water.

    3) Drinking water at about 3 p. m. can clean the wastes out in your body.

    4) About eight o'clock in the evening is the best time to drink water. Your blood gets thicker when you sleep. Water will make your blood less thick.

    Besides, we should drink 2L of water every day. Water is so important in our life. We should drink water often.

The human spine（脊柱） doesn't just help us stand up straight. Inside the spine is the spinal cord (脊髓) {#blank#}1{#/blank#} The legs and feet send "sense" information to the brain, saying they're hurt or hot, for example. And the brain sends messages to the lower body, telling the legs to walk, dance or sit down. 

When someone's spinal cord is hurt, information about senses doesn't reach the brain from the lower body. And control messages can't make it to the lower body from the brain. {#blank#}2{#/blank#}

Surprisingly, now scientists in Switzerland have given three paralyzed men the ability to walk again. All of the three men had damaged their spinal cords in motorcycle accidents and couldn't move their legs. To help them walk again, a special device (装置) was put directly on the lower part of their spinal cord. 

The scientists controlled the device from a computer. {#blank#}3{#/blank#} In the past, scientists have had some successes with the similar device in the lower spine. Some patients have even trained themselves over months to be able to walk. 

But this research is different. {#blank#}4{#/blank#}Instead, the computer tells the device to send "walking" messages. The scientists use computers to create patterns of movement—like taking a step—that work well with each patient. The patients then choose the pattern they want, and the muscles (肌肉) move in the chosen way. 

Over time, the three men are able to walk on their own, using a special walker with buttons to trigger (激发) each leg. {#blank#}5{#/blank#} The scientists are hopeful that in the future, this technology will allow more paralyzed people to walk again. 

Hello! Do you know how people greet each other in different countries? Let's find out!

In Asia, people often bow their heads. It's a nice way to be polite without touching(接触).

When you meet someone in India(印度), they might say" Namaste." They touch their hands together to show respect(尊重).

In Turkey(土耳其), you might see people kissing an older person's hand and then their forehead(额头). It's a kind way to show respect.

The Maori, who live in New Zealand, have a special way to say hello. They touch noses and foreheads. It's called" hongi."

In Malaysia, people put their hand on their chest(胸部) and nod their heads. It's a friendly way to greet someone.

In the US and some other countries, people often shake hands. It's a common way to say" hello."

Sometimes, friends just smile and say" Hello" or" Hi."A smile can make everyone feel good.

In some places, friends kiss each other on the cheek(脸颊). They might do it once, twice, or even three times!

So, when you meet new people, remember that there are many ways to say" hello" around the world.

注意：（1）必须包含表格中所给伯息，可适当发挥，使全文连贯、通顺： （2）文中不得提及真实的人名、校名等相关信息： （3）词数80﹣100词，开头和结尾已给出，不计入总词数。

Hello，everyone!Next week，we'll have some activities about Chinese traditional culture. Here's the plan for you.

Hope you enjoy the activities and have a good time!