China has recently published its first artificial intelligence (AI) textbook for high school students, following a plan by central government last year to include AI courses in primary and secondary school.

    Under the joint efforts by the research center for MOOC at East Normal University and AI startup Sense Time Group, the nine-chapter textbook, named Fundamentals of Artificial Intelligence, was written by eminent scholars from well-known schools nationwide, Xinhua reported on Sunday.

    It includes the history of AI and how the technology can be applied in areas such as facial recognition, auto driving and public security.

    “The textbook focuses not only on basics of AI, also on practical use of AI in daily life,” said Chen Yukun, a professor at East China Normal University, who is also a contributor to the book. At present, about 40 high schools across the country have joined the first batch（批）of AI high education pilot program, by introducing the textbook in curriculum（全部课程）.

    “The AI sector is facing a talent shortage globally. The publication of the book is a breakthrough as it takes AI technology out of the 'ivory tower' and makes it part of high school learning,” said Lin Dahua, a professor at the Chinese University of Hong Kong.

    As early as 2016, the governments had estimated that demand for AI professionals may suddenly increase to 5 million in the coming years.

    “Many industries in the future will benefits from AI technology, so the aim of the related courses should be to let students learn the basic idea and methods of AI,” Lin said.

    China has made significant progress in technological research and development in recent years. According to a report released by US-based venture capital（风险资本）database CB Insights in March, China has for the first time surpassed the United States in equity funding（股权融资）to AI startups.

    Tiny as they are, bats have the ability to “see” in the dark by using a special skill called echolocation(回声定位法). They make noises and wait for sound waves, or an echo, to bounce(反弹) back off objects. They can tell the distance of various objects by how quickly the sound waves bounce back off them. If no sound bounces back, they can then fly forward.

    This special ability has been simulated in the human world for a long time, such as in submarines and planes, whose sonar(声呐) systems are somewhat similar to echolocation. But apart from helping vehicles “see” where they are, what if blind people could use echolocation for themselves? It turns out, some already are.

    American Daniel Kish, who is blind, is known as “Batman”. This isn't because he walks around in a cape and a mask, but because he has a bat-like ability to locate where he is through sharp clicks he makes by moving his tongue against the roof of his mouth. Kish is so skilled at echolocating that he can ride a bike and hike on his own.

    Recently, research carried out at the University of Durham in England shed some light on the power of human echolocation.

    Kish worked with a group of scientists who studied the way blind people listen to the echoes that they produce from clicks.

    The team, which conducted experiments with other volunteers, found that people were capable of hearing even very faint echoes, ones far fainter than had been previously thought.

    Speaking to The Independent, Lore Thaler, lead scientist of the group, said, “We found that in some conditions, they were really faint – about 95 percent softer than the actual clicks, but the echolocators were still able to sense this.”

    Andrew Kolarik of the University of Cambridge is another expert in echolocation. Reacting to the Durham study, he told BBC News that echolocation “can be very useful at providing information at face or chest height” and could help people “avoid objects like low hanging branches that might not get detected by the cane or a guide dog”.

    Although Kish's skill is remarkable, there's hope for other blind people who want to use echolocation. According to BBC News, echolocation is a skill blind people can acquire and develop, just like learning a language. As Kolarik said: “Teaching echolocation skills could provide blind people with the means of exploring new places.”

    According to the Guinness World Records, a Sitka Spruce (锡特卡云杉) growing on New Zealand's southernmost island is the loneliest tree on Earth. Not only is it the only tree on Campbell Island, but the nearest other tree can be found over 200 km away on the Auckland Islands.

    Bluff, Campbell Island is one of the harshest places in the world. With strong winds blowing almost all year round and less than 600 hours of sunshine, it's not exactly a good place to live in, which is probably why, except for occasional visits by research scientists, it, has remained deserted for over half a century.

    It is believed that the Sitka Spruce on Campbell Island was planted by Lord Ranfurly, a former governor of New Zealand, sometime between 1901 and 1907. It's not clear why he decided to plant there, but according to some sources he said that the island was not productive, and took the first step to cover it with forestry. His idea was never going to work because of the harsh climate of the area, but somehow the Sitka Spruce survived.

    Apart from its reputation as the loneliest tree on Earth, the Sitka Spruce of Campbell Island has a series of other particularities. First of all its shape makes it look more like a giant cauliflower than a tree. This is believed to have been caused by repeatedly cutting down its trunk every year, for decades. Another interesting thing about the world's loneliest tree is that, though it is over 100 years old, it has never produced cones (球果).

    Who knew a lonely tree growing 200 km away from its nearest cousins could be so interesting?

Teenagers often form bad habits as they grow up. If{#blank#}1{#/blank#}(leave) unchecked, these bad habits could lead to physical and mental health {#blank#}2{#/blank#}(problem). So it is necessary for us{#blank#}3{#/blank#}(recognise) bad habits and make some changes. We can first analyse them by using the "habit cycle": cue, routine and reward. We first find out {#blank#}4{#/blank#} the cue is and then change the bad routine{#blank#}5{#/blank#} a positive one. If successful, we will {#blank#}6{#/blank#}(reward) with a good habit and our bad habit may disappear. In fact, making some changes is very difficult.{#blank#}7{#/blank#}(reach) the goal of change, we must show some discipline and {#blank#}8{#/blank#}(repeated) take many small steps over time. All in all, there is no "magic pill" or delete button {#blank#}9{#/blank#}will help us, but changing will ensure we have a happy and {#blank#}10{#/blank#}(health) life full of good habits. 

No one can believe that the over 6, 300-kilometre Great Wall might disappear some day. Believe it or not, the Great Wall is being destroyed by people. Less than 20 percent of the Great Wall built in the Ming Dynasty is still perfect, and about 80 percent is in danger. 

The Great Wall can be called "great" mostly because of its amazing length. If we do nothing to save the Great Wall, it will become wasteland rather than a historic site. The Great Wall is actually a series of walls built and rebuilt by different dynasties over the past 2, 000 years. It began in the Qin Dynasty, and lasted into the Ming Dynasty. The parts built before the Ming Dynasty have nearly disappeared. People are familiar with sections such as Badaling in Beijing and Jiayuguan Pass in Gansu, because they have been open to tourists for many years. But those sections far away from the public eyes have been almost forgotten. 

Few local people knew the 3-metre-high walls made of earth and stones beside them are part of the Great Wall. The lack of knowledge is considered as one of the main reasons behind humans. 

The bricks on the Great Wall are carried off by countryside people to build their houses. Rubbish is spread over the battlements. Those who destroyed and are destroying the Great Wall know its name, but don't know its cultural meaning. The local farmers not only carried off the body of the Great Wall but dug out the entire base. 

It is necessary to protect the Great Wall. First of all, the officials should be aware of the importance of the Great Wall. Young Chinese should know more about the nation's great civilisation and learn to love it. 

Shuttlecock (毽子) kicking is a traditional popular folk game, {#blank#}1{#/blank#} (date) as far back as the Han Dynasty.The fun game gained popularity during the Tang Dynasty, when {#blank#}2{#/blank#} (store) specializing in the shuttlecock business appeared. In the Qing Dynasty, shuttlecock kicking reached its peak in terms of both making techniques and kicking skills.

To make a feather shuttlecock, a piece of cloth wrapped around a coin {#blank#}3{#/blank#} (need). Through the coin hole you can stick some feathers, {#blank#}4{#/blank#} function is to delay the rising and falling of the shuttlecock.

There {#blank#}5{#/blank#} (be) a great number of variations in styles and methods of kicking. With one leg fixed on the ground, the shuttlecock is kicked by the inner ankle of {#blank#}6{#/blank#} other. Some other styles include kicking the shuttlecock backwards and forwards between two people. Those who advance to a high level of mastery can perform some actions that are {#blank#}7{#/blank#} (fair) wonderful. The challenge of the increasingly difficult levels of shuttlecock kicking has made it a popular and timeless game among Chinese children.

Playing with shuttlecocks is {#blank#}8{#/blank#} (benefit) to health. When people are kicking shuttlecocks, various parts of the body need to work together, which enhances balance capabilities and physical flexibility and helps them strengthen their legs. Besides, shuttlecock kicking is convenient {#blank#}9{#/blank#} (play). It can be practiced just about anywhere and anytime.

Since the establishment of the Chinese Shuttlecock Kicking Association in 1987, the national shuttlecock kicking tournament has been held annually, appealing {#blank#}10{#/blank#} people of all ages.