Written in the first chapter of the book Pride and Prejudice is an extraordinary sentence of which even a person who has had only a brief look upon the book will not fail to receive a deep impression — It is a truth universally acknowledged that a single man in possession of a good fortune must be in want of a wife. In terms of Sherlock Holmes, we'd better alter the sentence into “It is a fact universally accepted by readers throughout the world that an excellent book in possession of our famous detective Sherlock Holmes is undoubtedly a masterpiece of all times.” Perhaps this is one of the most obvious explanations for the unrivaled popularity of “Holmes series” in the field of detective stories. Overwhelmed by the recommendations provided by my friends, I decided to take a look on this Sherlock Holmes and the Duke's Son originally published by Oxford University Press.

    As a whole, this book is about a case concerning the Duke's missing son. Arthur, the Duke's son, was found out in a certain morning to have disappeared, accompanied with which was also the disappearance of the German teacher. The school master Dr. Huxtable then turned to the famous detective of the time Sherlock Holmes for help. Realizing how tough and important the case is, Holmes immediately made up his mind to accept the case and followed Dr. Huxtable back to Mackleton by train. Having formed a rough idea about the whole matter, Holmes probed into the case immediately and had a careful investigation of the entire area shortly after the arrival, during the process of which he discovered the body of the German teacher Heidegger. Finally, primarily due to his prominent ability as a detective, he managed to unravel the mystery.

    Having once started reading this fiction, I was completely immersed in the mysterious story. At the beginning, unlike other detective stories, this story first delineates the client's strange behavior at length to indicate the severity of the incident in order to attract the readers to continue reading it. As is known to all, vivid depiction is essential to detective stories as it makes the story more authentic and attractive. Therefore, trying to present a “real world” to his readership, Sir Arthur Conan Doyle, author of the original “Holmes series”, has skillfully arranged the plots of the whole story from the perspective of Dr. Watson, a friend of Homes'. In this way, he elaborately (精心)depicted every scene and character in the book. Apart from the special start, the ending of the whole story, being dramatic but reasonable, is certainly an outstanding one. After all, except the author himself, who knows that the Duke's seemingly ordinary secretary is in fact the Duke's bastard(私生子)? In addition, who knows that the Duke actually has already been acquainted with the whole thing before Holmes solves this complicated problem? Yet, surprising as it is, this ending seems so natural that it fits all the plots of the story perfectly well. Closing my eyes, I can even “see” the story happening just like watching a film.

    As far as I am concerned, nothing is more admirable and surprising in the hero Sherlock Homes than his profound knowledge which has certainly assisted him a lot when he was studying the case. Take the bicycle tyres for instance, Holmes is capable of recognizing 42 different varieties of bicycle tyres. Except for his illimitable knowledge, Holmes also specializes in arranging the facts in order and then finding the fact leading him to a great discovery or even the truth itself. In this case, after getting rid of unrelated facts, Sherlock Homes eventually grasped the clue and discovered the amazing fact.

    Needless to say, as a world-renowned masterpiece, Sherlock Holmes and the Duke's Son has attracted and is still charming numerous readers from all corners of the world and people from all walks of life. The “Holmes series” has already set up a standard against which all the following detective fictions are measured. Sherlock Holmes, beyond all doubt, has been a name firmly rooted in people's memories. Although Dr. Watson's closing The Case Book of Sherlock Holmes in 1927 was a great pity to the readers, the discontinuance of the entire “Holmes series” may have actually added to the legendary stature of Sherlock Holmes.

    Fitbit Charge

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    Activity Tracking -- Accurately track all-day statistics like steps taken, distance traveled, calories burned, stairs climbed, and active minutes.

    See daily statistics, time of day, and exercise mode with a bright OLED display.

    Auto Sleep + Silent Alarm — Monitor your sleep automatically and wake with a silent alarm.

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    Access real-time run statistics like time, distance, and pace to stay on track.

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    See compatible (兼容的) iOS, Android, and Windows phones.

    FREQUENTLY ASKED QUESTIONS

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    If your tracker is not responding, it may be fixed by restarting.

    1 Plug your charging cable into the USB port and insert your tracker into the charging cable.

    2 Insert a paperclip into the small pinhole on the back of the charger.

    3 Press on the pinhole for 3—4 seconds.

    Your tracker will now be reset. Take your tracker out of the charger and insert it back into the wristband.

    How do I charge my tracker?

    Your tracker battery lasts for about 5 days. To charge it, remove the tracker from the band and place it in the charger until all 5 lights are solid.

    If you have more questions, you may log in and post your questions here. We will solve your problems as soon as possible.

    Barbara McClintock was one of the most important scientists of the twentieth century. She made important discoveries about genes and chromosomes (染色体).

    Barbara McClintock was born in 1902 in Hartford, Connecticut. Her family moved to the Brooklyn area of New York City in 1908. Barbara was an active child with interests in sports and music. She also developed an interest in science.

    She studied science at Cornell University in Ithaca, New York. Barbara was among a small number of undergraduate students to receive training in genetics in 1921. Years later, she noted that few college students wanted to study genetics.

    Barbara McClintock decided to study botany, the scientific study of plants, at Cornell University. She completed her undergraduate studies in 1923. McClintock decided to continue her education at Cornell. She completed a master's degree in 1925. Two years later, she finished all her requirements for a doctorate degree.

    McClintock stayed at Cornell after she completed her education. She taught students botany. The 1930s were not a good time to be a young scientist in the United States. The country was in the middle of the great economic Depression. Millions of Americans were unemployed. Male scientists were offered jobs. But female geneticists were not much in demand.

    An old friend from Cornell, Marcus Rhoades, invited McClintock to spend the summer of 1941 working at the Cold Spring Harbor Laboratory. It is a research center on Long Island, near New York City. McClintock started in a temporary job with the genetics department. A short time later, she accepted a permanent position with the laboratory. This gave her the freedom to continue her research without having to teach or repeatedly ask for financial aid.

    By the 1970s, her discoveries had had an effect on everything from genetic engineering to cancer research. McClintock won the Nobel Prize for Physiology or Medicine in 1983 for her discovery of the ability of genes to change positions on chromosomes. She was the first American woman to win an unshared Nobel Prize.

Dear Daisy,

    Phew! I'm so glad the day is over. I'm really tired, but my first day at school went well.

    First of all, we met outside the school building. I was very nervous because my primary school only had 300 pupils but in the middle school there are about 1300. What a difference! The older pupils are really big. I felt so small waiting there in front of the school.

    The head teacher came out and told us to go into the school hall. Then he called our names out to tell us which class we were in. My class teacher is called Mrs. Black. She took us to our classroom. It's on the 5th floor. We aren't allowed to use the lift! I couldn't believe it.

    We spent all morning with Mrs. Black looking at our timetables. Everyone in the school had a different timetable. I'm worried that I'll forget my timetable and go to the wrong room.

    Lunchtime was OK. I had salad, fish and fruit, which was quite good, and then I went to play football with some of the other boys. They were all friendly and I don't think it will take me long to make friends.

    After lunch we started lessons. I had maths and then history, where we started to learn about ancient Greece. That looked interesting. 1 have to do some homework tonight to find out how the ancient Greek people lived, so I'm going to do an Internet search and look it up in the library.

    So far so good. I am quite looking forward to tomorrow, even though I've got science. I hate science!

Yours,

Jason

The Peony Culture Festival of Luoyang

    Spring is time for people to go out and see blossoming flowers. Luoyang in Henan, China is famous for peonies, the city's official flower. The city's annual Peony Culture Festival begins in early April and lasts till early May. Peonies are in full bloom during the event, which was first held in 1983.

    You can go to the Luoyang National Peony Garden. The peonies there are known for their rich colors and long florescence. Don't miss the 1,600-year-old "Peony King"!

    Chinese Language Day

    Chinese is one of the six official working languages of the United Nations. The LIN has set different days for these languages to promote their uses. It holds exhibitions, shows and other activities. In 2010, the first Chinese Language Day was held on Nov. 12. But since 2011, it has been held on April 20. The date is close to Grain Rain, one of the 24 solar terms. It means "rain of millet". People celebrate Grain Rain to remember Cangjie, a mythical character. Many people believe that Cangjie was the first person to write Chinese characters. When he did this, it rained millet and saved people from hunger.

    China Astronautics Day

    On April 24, 1970, China's first man-made Earth satellite — Dongfanghong I — went into space. It was a big step for China's space program. In 2016, the government set April 24 as China Astronautics Day. Many events are held across the country to celebrate this special day. For example, astronauts and scientists will give talks to students. Some cities will hold exhibitions about space development.

    Last year, China had big plans for its space program. On December 8, it launched its second lunar rover（月球车）as part of the Chang'e 4 space mission, which landed on the far side of the moon.

    When a driver slams on the brakes to avoid hitting a pedestrian crossing the road illegally, she is making a moral decision that shifts risk from the pedestrian to the people in the car. Self-driving cars might soon have to make such ethical (道德的)judgments on their own — but settling on a universal moral code for the vehicles could be a tough task, suggests a survey.

    The largest ever survey of machine ethics, called the Moral Machine, laid out 13 possible situations in which someone's death was unavoidable. Respondents were asked to choose who to spare in situations that involved a mix of variables: young or old, rich or poor, more people or fewer. Within 18 months, the online quiz had recorded 40 million decisions made by people from 233 countries and territories.

    When the researchers analyzed these answers, they found that the nations could be divided into three groups. One contains North America and several European nations where Christianity has been the dominant (占支配地位的)religion; another includes countries such as Japan, Indonesia and Pakistan, with strong Confucian or Islamic traditions. A third group consists of countries in Central and South America, such as Colombia and Brazil. The first group showed a stronger preference for sacrificing older lives to save younger ones than did the second group, for example.

    The researchers also identified relationships between social and economic factors in a country. They found that people from relatively wealthy countries with strong institutions, such as Finland and Japan, more often chose to hit people who stepped into traffic illegally than did respondents in nations with weaker institutions, such as Nigeria or Pakistan.

    People rarely face such moral dilemmas, and some cities question whether the possible situations posed in the online quiz are relevant to the ethical and practical questions surrounding driverless cars. But the researchers argue that the findings reveal cultural differences that governments and makers of self-driving cars must take into account if they want the vehicles to gain public acceptance.

    At least Barbara Wage, who heads a group working on autonomous-vehicle ethics at Audi in Ingolstadt, Germany, says such studies are valuable. Wage argues that self-driving cars would cause fewer accidents, proportionally, than human drivers do each year—but that people might focus more on events involving robots.

    Surveys such as the Moral Machine can help to begin public discussions about these unavoidable accidents that might develop trust. "We need to come up with a social consensus," she says, "about which risks we are willing to take."