My school stood in a big square playground in southeastern South Dakota. One teacher taught all grades, first through eighth. Most grades had only two or three students.

    Our school day started with the flag pledge(宣誓). Then the teacher called one grade at a time to the recitation bench beside her desk. She'd check our work, explain the new lesson, and dismiss us to go back to our own desks and do our new work, all in less than ten minutes per grade.

    At noon we ate lunches we had brought. Our lunches consisted of homemade sandwiches and if we were lucky, dessert. My favorite dessert was a fresh pear, and a piece of Mom's delicious sour cream chocolate cake.

    The annual Christmas program was the most exciting part of the year. We hurried through our lessons during December to allow time to practise poems, songs, and plays.

    A few days before the performance, the school board members borrowed equipment from the town and set up a stage across one side of the classroom. We hung bed sheets for curtains.

    On the evening of the performance, petrol lanterns hanging along the walls cast a warm, though not very bright, light over the gathering crowd. We could hardly contain our excitement as we looked from behind the curtains to wave at our parents.

    On a spring Sunday in a new term, just before the last day of the school term, everyone in the neighborhood gathered for a picnic. Our moms set fried chicken, bowls of salads, and desserts on the teacher's desk and the library table. After the dinner, we played games. One of the school board members brought big buckets of ice cream in the afternoon to top off the picnic. How we looked forward to that treat!

    I was just nineteen years old when I started my first teaching position in a country school with thirteen students. I felt excited, nervous and happy as I prepared my lunch bucket the first morning of the term. I can't remember what kind of sandwiches I packed, but I do remember I put in a fresh pear and a piece of chocolate cake for dessert!

    Are you interested in students in other countries: Do they also have so much homework like you? What do they do in their spare time?

    On April 8,a report came out on the lives of high school students in China,Japan,South Korea and the US.It surveyed（调查）around 6,200 students from the four countries last year.You will find the answers to many of your questions in this report.

    Who study hardest?

    Chinese students spend the most time studying.Nearly half of Chinese students(48.6%) spend more than two hours on their homework every day.That's much more than students of the US(26.4%),Japan(8.2%) and South Korea (5.2%).

    Who sleep most often in class?

    Japanese students fall asleep in class most often.About 45% of them said they sometimes sleep in class.In South Korea, it's 32%;in the US,21%;and 5% in China.

    Who are the most distracted（分心的）?

American students are the most active in class,but also the most distracted.64.2% said they chat with friends in class;46.9% said they eat snacks in class;and 38.9% said they send emails or read storybooks in class.

    What do they do after school?

    In their spare time, most Chinese students study or surf the Internet.Most American students go out to play with their friends.Most Japanese students do physical exercises.Most Korean students watch TV.

Beijing Imperial Court Food

    Imperial Court Food(宫廷菜) is a style of food with origins in the Imperial Palace and it is well-known for the original features of the raw materials and carefully selected ingredients(原料). In addition, the dishes are decorated with different colored vegetables and fruits in various shapes. Each dish has a special name, such as Yu Feng Huan Chao. And some of them even have short stories. Today, Imperial Court Food has become an important school of Chinese cooking with several places offering this special taste. While expensive, it is worth trying.

    Restaurants of Imperial Court Food

    Fangshan Restaurant

    Fangshan Restaurant is the most famous one offering the first-class Imperial Court Food. The restaurant is made up of three parts and it can hold 500 people eating at the same time. It is decorated in imperial style with the design of dragon and phoenix. Here is the best place to experience the life of the Chinese emperors in former days. Now, it serves nearly 800 kinds of Imperial Court Dishes. Among them, Man-Han Banquet is the most famous.

    Li Jia Cai Restaurant

    The dinner here is served by set menu starting at ¥298/person. That is to say, a guest cannot order a dish but a set of dishes. There are no chemicals in the dishes and all tastes are natural. This restaurant has welcomed many famous people including Bill Gates, the former premier of Britain, John Major, and Chinese superstar Jackie Chan.

    Yushan Restaurant

    The layout of the restaurant follows the imperial palace. When eating in the restaurant, diners are served by waitresses in traditional imperial clothes.

    Da Zhai Men

    The dishes and snacks cooked in this restaurant are worthy to have a try. And, the traditional performances at night is one of the restaurant's attractions.

    Royal Palace

    Both of the food and service of this restaurant are so good. You can also enjoy some wonderful performances in this large courtyard.

    A rabbit and two ducks were good friends. They used to meet on the bank of a river and play together. One day the ducks told the rabbit that they had found a carrot farm on the other bank of the river. The rabbit was excited and quickly asked for the help of his friends to cross the river, reach the farm and enjoy the carrots. The ducks agreed to carry him across the river.

    They made a wonderful plan to cross the river. The two ducks entered the river and stayed close to each other. The rabbit carefully got on their backs and stayed still. Then the ducks slowly swam across the river, staying close to each other. The rabbit cautiously stayed on top of the moving birds.

    Right before they reached the center of the river, the ducks suddenly saw a large number of fishes swimming together. In the excitement of finding a delicious meal in the water, the ducks quickly swam to either side to catch the fishes. They forgot about the poor rabbit on their backs, who fell down into the deep river as the ducks moved away. The ducks remembered their job only after they finished their meal. However, by that time the poor rabbit had already drowned (淹死). The foolish ducks were sorry to miss their good friend.

    From this short story, we know love should not be just words and talk; it must be true love, which is shown it in action.

    They still bite, but new research shows lab-grown mosquitoes are fighting dengue fever — a dangerous disease that they normally would spread. Dengue infections appear to be dropping fast in communities in Indonesia, Vietnam, Brazil and Australia that are filled with the specially grown mosquitoes.

    Researchers first injected (注射)mosquito eggs with Wolbachia bacteria that's common in insects and harmless to people in a lab. Infected females then pass the bacteria on through their eggs. Releasing enough Wolbachia carriers, both the females that bite and the males that don't, allows mating(交配)to spread the bacteria through a local mosquito population.

    Rather than using chemicals to wipe out pests, "this is really about transforming the mosquito," said Cameron Simmons of the nonprofit World Mosquito Program, which is conducting the research.

    The first success came from Australia. Mosquitoes carrying Wolbachia were released in parts of North Queensland starting in 2011, and gradually spread through the local mosquito population. Dengue is spread when a mosquito bites someone who is infected, and then bites another person, but somehow Wolbachia blocks that — and local spread has nearly disappeared in those North Queensland Communities, Simmons said.

    The studies are continuing in other countries. But the findings, presented at a meeting of the American Society for Tropical Medicine and Hygiene, suggest it's possible to turn at least some mosquitoes from a public health threat into annoying biters.

    The work marks "exciting progress," said Michigan State University professor Zhiyong Xi, who wasn't involved with the project but has long studied how Wolbachia can turn mosquitoes against themselves.

    More research is needed, specialists cautioned. "The results are pretty exciting — strong levels of reductions — but there clearly are going to be things to be learned from the areas where the reductions are not as great," said Penn State University professor Elizabeth McGraw.

Singapore researchers say they have developed a form of electronic skin that can create a sense of touch. They hope their invention will give people with prosthetic hands (假肢手) the ability to identify different objects.

The skin device measures 1 square centimeter. The system contains 100 small sensors that attempt to recreate things like texture (质地), temperature and even pain. The researchers call the device Asynchronous Coded Electronic Skin, or ACES, which can process information faster than humans' nervous system. Machine learning methods trained the device to recognize 20 to 30 different textures. It can even correctly read Braille letters most of the time, the researchers say.

The system does not require the users' movement to work. Humans need to slide to feel texture. But in this case the skin, with just a single touch, is able to detect textures of different roughness.

A demonstration showed that the device could identify the difference between a soft ball and a solid plastic one. "When you lose your sense of touch, you essentially become numb and prosthetic users face that problem, " said Benjamin Tee, leader of the research team. "So by recreating an artificial version of the skin, for their prosthetic devices, they can hold a hand and feel the warmth and feel that it is soft."

Tee said his idea for the device came from the movie Star Wars, when character Luke Skywalker loses his right hand and it is replaced with a robotic one. In the film, the new hand is able to experience touch sensations just like the real one.

The artificial skin technology is still going through experiments and development. But Tee said there had already been a lot of interest in the system, especially from the medical community. Tee said similar inventions that his team has developed include see-through skin that can repair itself when torn and a material for wearable electronic devices that gives off light.