Mrs. White lived in a town of England. Her husband died three years ago and one of her children worked in the capital and the other three lived in another town. Her husband didn't leave her much money and she had to live a simple (简朴) life. Sometimes her children went to see her during their holidays, but they stayed with her for only two or three days.

    One winter morning the old woman got up early. She was going to buy some food in a shop. And when she came out, she found there was much snow in the street. She had to sweep it away. And suddenly she found a dying dog at the comer of the house. She picked it up and took it into the house quickly. She put it near the fire and gave it some milk and bread. At first the poor dog ate nothing and that afternoon it drank some milk and three days later it was all right. Now the old woman found it was a beautiful dog. And she liked it very much and took it everywhere she went. A week later she went shopping with her dog. At a bus stop a young man was eating fish and chips. The little dog became very excited at the smell of the man's lunch and began jumping up at him.

    “Do you mind if I throw it a bit?'' asked the young man.

    “Not at all,” answered Mrs. White.

    Having heard this, he picked up the dog and threw it over the wall.

    I am Henry Jekyll. I was born in the 1 800s. I inherited(继承) a large fortune, a healthy body and an excellent mind. I was naturally hard-working and soon I was very successful in my job. So the outside world saw a serious, hard-working, successful doctor. Behind this quiet character, however, was a wild, fun-loving, irresponsible young man. Both of them were me. They lived together in the same body.

    “Was it possible," I wondered, “to find a drug that could give each side of my character its own separate face and body?"

    After much thought and careful study I believed I had found the answer. I had read many scientific books and spent many hours in my laboratory, searching for the right mixture of chemicals to make my drug. At last I got everything ready.

    Late one night, I mixed everything together and prepared my drug. I watched the smoke rising from the liquid as its color changed from red to purple and at last to green. Then, bravely, I drank every bitter drop.

    I felt a violent sickness in my stomach and a terrible pain in all my bones. The room seemed to turn round and round and I trembled with fear. Then the fear and pain disappeared and a strange, sweet feeling took its place. Wild thoughts danced through my mind- the wild passions of an evil and cruel stranger. But inside myself I felt younger, lighter, more carefree than ever before. "If this is pure evil," I thought, “I like it.”

    I stood there, enjoying these strange new thoughts and passions and suddenly realized that I was shorter. So I decided to go to my bedroom in my new body and take a look at myself in the mirror there. As I came into my room, I saw Edward Hyde for the first time.

    At that time, the good side of my character was stronger than the evil side. Henry Jekyll had his faults, but he was mostly a good, kind man. I believe that is the reason why Edward Hyde was so much smaller than Henry Jekyll. But that was not the only difference between the two men. Henry Jekyll had a kind, open, honest face. But pure evil stared out of Edward Hyde's eyes. I felt no dislike, however. Indeed, I welcomed him. Edward Hyde was me, young and strong and full of life.

    Exercise is known to benefit people's mental health, but scientists recently discovered that too much exercise may have a negative effect on it.

    The researchers studied about 1.2 million people in the United States in 2013, 2015 and 2017. The participants, on average, experienced 3, 4 days of poor mental health each month. Those who did exercise experienced 1, 5 fewer days of poor mental health per month, compared to those who didn't exercise at all. The team found that people who exercised for 30 to 60 minutes three to five times a week had the best mental health, but those who exercised for more than three hours had worse mental health than those who didn't exercise at all.

    The scientists think that people who exercise so much may experience poorer mental health because that much exercise can be a sign of obsessive (强迫症患者) behaviors that have been associated with poor emotional and psychological outcomes. However, the only mental health disorder that the researchers looked at was depression.

    Among those who had been diagnosed with depression, people who did exercise experienced 3.75 fewer negative mental health days than those who did not, showing an ever greater difference, According to the Centers for Disease Control and Prevention. 7, 6 percent of people in the U.S. age 12 and over have depression. While all types of exercise appeared to help with mental health, cycling, gym-based exercise and team sports were the most beneficial.

    The team also looked at more specific factors, like education. People with a college education reported 17.8 percent fewer days of poor mental health than those without that level education Additionally, people in a healthy BMI (体重指数) range reported a 4 percent reduction in poor mental health days thin those whose BMIs were high. Even salary was a factor: compared to people with bower salaries, those with higher salaries experienced a 17 percent reduction in poor mental health days.

    The study showed that exercise can help with mental health, but that in some cases, limiting it may be necessary.

    British children generally learn how to ride a bike at a young age. I am an exception to that rule. It's not my dad's fault—he tried to teach me. I remember cycling around the neighborhood. To be honest, though, I never saw the appeal. One of my earliest memories is falling from my bike and into some spiny(多刺的) plants. I definitely didn't want to repeat that.

    So I stopped learning. My dad wasn't going to waste his time teaching someone who didn't want to be taught. Time passed and I accepted that I couldn't ride a bike. It never affected my life in high school because I lived close enough to walk.

    I never felt like I was missing out until I couldn't go on a bike ride with friends in Byron Bay because I was only confident that I could go on a flat surface in a generally straight line. So when the opportunity came up to bike the wall of Xi'an, I wanted to prove to myself that I could do it and make up for missed time. So, with a friend who is very patient, I got on the bike. Instantly nothing came flooding back to me, I had absolutely no idea how to start! "Push off with one foot hard" was my instruction. It sounded simple enough but it just would not happen. Until something clicked and suddenly I was off, going in a straight line on a flat surface and managing to avoid the Chinese tourists who obviously found exaltation on my face.

    At 22 years old, I finally learnt how to ride a bike, and nothing can hold me back.

    Do you like to flaunt your expensive items? You could find yourself without friends! Scientists prove that expensive status symbols make you look less socially attractive.

    Items such as a fancy car and a Rolex watch are often thought to increase our social standing and often come with a high price tag(标签). According to the latest research, however, it has the opposite effect and people would prefer to be friends with someone who places less value on material objects.

    "Often we think that status symbols will make us look more socially attractive to others, "says Stephen Garcia, the study's lead author from the University of Michigan. He adds, "However, our research suggests that these status signals actually make us look less socially attractive.

    The researchers conducted six studies which assessed how people presented themselves and how people viewed strangers. People who chose to wear higher status items tended to get a negative response, but people wanted to be friends with people who preferred lower status symbols.

    The study took the role of the luxury item to see if it was possible that the expensive item itself played a part in people's reactions. The definition of a status symbol changed based on a person's socioeconomic status, but the same effect of keeping off potential friends was seen regardless of social position.

    "At a social level, we may be wasting billions of dollars on expensive status symbols that finally keep others from wanting to associate with us, "says Kimberlee Weaver Livnat at the University of Haifa. She says, "And to the extent that close friendships are important to well-being, we may be unintentionally hurting ourselves."

    However, Patricia Chen of the National University of Singapore said this does not necessarily mean status symbols are a bad thing. She says, "Our findings right now only apply to the formation of new friendships, Status symbols may be beneficial at other times and in other settings, such as when trying to establish new business contacts."