As the G20 Leaders Summit(峰会)kicked off on Sept 4, Hangzhou, the host city, took measures to promote its reputation for entrepreneurship(企业), as well as its many beauty sports, to those overseas people.

    Although many may have been surprised when Hangzhou was chosen to host the summit over bigger cities such as Beijing or Shanghai, economic statistics suggest that it's well deserving of the honor.

    When the national economy grew at 6.7 percent in the first half of this year, the lowest in more than two decades, Hangzhou steamed ahead with a huge 10.8 percent growth, becoming one of the only two cities in China, alongside Chongqing, with a double-digit growth rate.

Walking along the streets of Hangzhou, through centuries-old paths and along the Broadway—like Yan'an Avenue, a tourist can pick up whatever he or she wants with just a smartphone, via Alipay or WeChat Pay—no cash or credit cards needed.

    And starting this month, one can also rent public bikes simply by scanning the QR code(二维码)with a smartphone.

Meanwhile, a short video showing the beauty of Zhejiang Province and its capital, Hangzhou, was being aired on CNBC channels during prime time until Sept 12.

    The promotional video, created by CNBC's Catalyst Content Studio, highlighted some of Hangzhou's most charming attractions.

From eye-pleasing beauty spots like the Qiantang River and West Lake to the towering headquarters of leading Internet corporations, the promo(宣传片)showed how the city built its culture on a long history of commerce and developed into a vast modern center of technology, imports and exports.

    Your telephone is running low on power while you are waiting to fly out of an airport.

    Then you discover a public USB charging area close by.{#blank#}1{#/blank#}Then you take a deep breath and sit back, happy to get the power for free.

What could go wrong? Plenty.

    In addition to providing an electrical current, phone charging cords can send and receive data. That free USB charging hub at an airport, hotel or any other public place may not only charge your phone.{#blank#}2{#/blank#}The USB charging hub could be connecting to your phone and copying your contact list, email and text messages, voice mail, photographs and videos. It can also copy passwords, banking information and any other information stored on your phone.

    If you want to charge your phone while traveling, you have other choices that do not increase your risks.

    Connect your phone only to electrical outlets so data transfer is not possible.{#blank#}3{#/blank#} It is better to use a distant wall outlet than a nearby USB charging hub.

    Carry an extra, fully-charged battery. Having one means you can charge your phone without having to worry about carrying a special cord or finding a power outlet.{#blank#}4{#/blank#}

    If you must use a public USB charging center, be sure to turn off your phone completely.

    {#blank#}5{#/blank#}But it will reduce the chances of it happening, depending on what phone you have.

A. Remember to fully charge your phone before you leave home or work.

B It also could be transferring information to and from the device.

C. The public USB charging hub may even download programs to your phone.

D This may or may not prevent data transfer.

E. You can charge your phone with the extra battery wherever you are.

F. An available outlet may not be as near as a USB charging hub, but the few extra steps may keep you safe.

G. You quickly reach for a charge cord and connect your phone to the charging hub.

    After two years of careful consideration, Robert McCrum has reached a conclusion on his selection of the 100 greatest novels written in English. Take a look at a few in his list.

    The Pilgrim's Progress by John Bunyan (1678)

    A story of a man in search of truth told with the simple clarity and beauty of Bunyan's prose makes this an English classic.

    Robinson Crusoe by Daniel Defoe (1719)

    By the end of the 19th century, no book in English literary history had enjoyed more editions and translations. This world-famous novel is a complex literature that one cannot resist.

    Gulliver s Travels by Jonathan Swift (1726)

    A great work that s been repeatedly printed, Jonathan Swift's Gulliver's Travels comes third in our list of the best novels written in English.

    Clarissa by Samuel Richardson (1748)

    Clarissa is a tragic heroine, pressured by her dishonorable family to marry a wealthy man she dislikes, in the book that Samuel Johnson described as “the first book in the world that shows the knowledge about the human heart”.

Tom Jones by Henry Fielding (1749)

    Tom Jones is a classic English novel that gets the spirit of its age and whose characters are well-known since they have come to represent the society at that time.

    Emma by Jane Austen (1816)

    Jane Austen's Emma is her most outstanding work, mixing the best parts of her early books with a deep sense of feelings.

    The Narrative of Arthur Gordon Pym of Nantucket by Edgar Allan Poe (1838)

    Edgar Allan Poe's only novel－a classic adventure story with supernatural elements－has fascinated and influenced generations of writers.

    As we know, everyone can make mistakes, but don't worry about it. The following is what we should do when we make mistakes.

    Just admit (承认）it. Don't think that our mistakes are caused by others. {#blank#}1{#/blank#}Don't blame other people, and don't cheat ourselves, either.

     {#blank#}2{#/blank#}In order to stop the problem from getting worse, we should act quickly to solve it. If we don't act and deal with the problem quickly, it'll only make us feel more stressed. Also it is necessary to make a plan of action and correct the mistake according to it.  {#blank#}3{#/blank#}

     {#blank#}4{#/blank#}   Those who have made the most mistakes can get an A, for they are the ones who have learned the most. The more we learn from our mistakes, the cleverer we are.

     {#blank#}5{#/blank#}What caused us to make the mistake? How can we avoid making the same mistake in the future? When we act with a method to get a good result, do it that way next time. If we don't, we should stop, think about it, change it and try again.

A. Realize that making mistakes is the best way to learn.

B. Don't be afraid of failure.

C. Be brave and face the fact that we have made the mistakes.

D. Solve it at once.

E. So be away from stress.

F. So decide quickly and act.

G. Think about what we can learn from our mistakes.

    Artificial intelligence (AI) technology may soon be a useful tool for doctors. It may help them better understand and treat diseases like breast cancer in ways that were never before possible.

    Rishi Rawat teaches AI at the University of Southern California's (USC) Clinical Science Center in Los Angeles. He is part of a team of scientists who are researching how AI and machine learning can more easily recognize cancerous growths in the breast. Rawat provides information about cancer cells to a computer. He says this data helps the machine learn. “…You can put the data into them and they will learn the patterns and the pattern recognition that's important to making decisions.”

    David Agus is another USC researcher. He believes that “machines are not going to take the place of doctors.” He adds, “Computers will not treat patients, but they will help make certain decisions and look for things that the human brain can't recognize these patterns by itself.”

    Once a confirmed cancerous growth is removed, doctors still have to treat the patient to reduce the risk of cancer returning. The form of treatment depends on the kind of cancer. Currently, researchers take a thin piece of tissue, put it on a small piece of glass and add color to better see the cells. This process could take days or even longer. Scientists say artificial intelligence can do something better than just count cells. Through machine learning, it can recognize complex patterns, or structures, and learn how the cells are organized. The hope is that machines will soon be able to make a quick diagnosis（诊断）of cancer that is free of human mistakes.

    “All of a sudden, we have the computing power to really do it in real time...We couldn't have done this, we didn't have the computing power to do this several years ago, but now it's all changed.” Agus adds that the process could be done “for almost no cost in the developing world.” He says that having a large amount of information about patients is important for a machine to effectively do its job in medicine.

    A doctor faces a series of critical decisions every day. The best a doctor can do is to make those decisions as informed as possible. Some of them are still hard to make. A doctor can ask people of whom he values their opinions and that's it. Imagine discussing these with an AI system that is even more rational（理性的）than anyone else.

    The University of Southern California researchers are now only studying breast cancer. But doctors predict artificial intelligence will one day make a difference in all forms of cancer.

A Colourful Puzzle

    People often wear clothing with colours that express something about themselves. A happy person might choose to wear a bright yellow shirt. A swimmer might wear a sea-blue dress.

    Animals appear in different colours too, but they don't get to pick what they wear every morning. Scientists have known for a long time about some of the ways animal colouring can be beneficial. They know that some animals' colours attract mates or show who is boss. Other animals' colours blend(融合) in with their environment; thus the animals cannot be seen by their enemies. Still, scientists do not fully understand why blue jays are blue or why rainforest frogs are golden. Now many scientists are working hard to figure out the puzzles of animal colours.

    Part of the answer can be found in an animal's habitat, the place where it lives. It turns out that many animals — especially birds, fish, and reptiles — can see more colours than humans can. These creatures notice colours that stand out in their habitat. For example, forests are mostly green, brown, and yellow. For an animal to be seen by others of its species, it would have to be a different colour than its background. That explains why you can find birds of many shades of blue living in forests.

    Another piece of the puzzle lies in what an animal eats. Birds often eat things that have chemicals in them called “carotenoids”(类葫萝卜素). These chemicals are what make tomatoes red and bell peppers bright orange or yellow. When birds eat these foods, the carotenoids affect the colour of their feathers. For example, a cardinal's bright red feathers will become lighter or darker depending on how many berries it has found to eat.

    Some animals do not have any colour at all — but they are not just white; they are transparent(透明的)! Transparent animals live mostly in the ocean. This amazing wonder of nature came about because the animals needed a way to escape their enemies. They are often slow, defenseless creatures that would have no way of fighting back if larger animals wanted to eat them. Because there are few places to hide in the ocean, these creatures have to hide in plain sight. A good example of this kind of transparent creature is the jellyfish. A jellyfish's body is almost all water, so it is very hard to see it floating in the ocean.

    Animals come in all kinds of colours. Their colours are caused by many different factors, and most animals will remain the same colour for their whole lives. Think how lucky we are to get to change our feathers every day!