阅读下列短文，从每题所给的四个选项 （A 、B 、C  和 D ）中，选出最佳选项。

    In 1841, a book was published which astonished the world. It was called “Incidents of Travel in Central America, Chiapas and Yucatan”. The author John Loud Stephens had just returned from a long, difficult and dangerous journey through the thick rain forest of southern Mexico and Guatemala. He had once been there with Frederick Catherwood, an architect and artist, to search for the remains of a lost civilization known as the Mayas(玛雅). Very little was known about the Mayas at that time, but Catherwood's drawing in the book showed incredible cities with temples, pyramids and other buildings as impressive as those of their northern neighbors, the Aztecs. These cities, however, were deserted. The inhabitants(居民) had disappeared almost a thousand years before.

    Since that time, far more has been learned about this remarkable civilization. The Mayas had a highly-developed system of government and of agriculture, as well as an incredibly accurate system of measuring time. They were also wonderful engineers capable of moving huge blocks stone long distances and cutting them to accurate shapes and sizes.

    And yet although the Mayas knew about the wheel, they never used it. Neither did they use metals other than copper. What is ever more surprising is that they suddenly abandoned many of their cities and built new ones in the jungle. Some time around AD 900, Mayan civilization collapsed(崩溃). By the year 1200, their last great capital, Chichen Itza, was deserted.

    Who were these strange people and the even stranger gods they worshipped? What brought about their sudden and mysterious collapse? Some writers have tried to prove that the Mayas had contact with visitors from space and even that they themselves came from another planet. Some people believe that their civilization came to an end because the Mayas never developed a proper resistance to local germs and diseases. All we really know is that when the first Europeans appeared off their coast in 1517, this great and mysterious culture was only a memory.

    Dyslexia(失读症) is a learning disorder, it interferes with the ability to recognise words, and for some readers to understand what they have read.

    Experts say dyslexia affects about five to ten percent of the population of the United State. Researchers have long known that people with dyslexia write or read words and letters backwards in the wrong order.

    But a new study shows that people with dyslexia may have trouble redirecting(重新传入) their attention between senses, from seeing something to hearing something. The study suggests something that might help dyslexic people learn more quickly — play video games.

    Vanessa Harrar of Britain's University of Oxford led the study. She reported the findings in the journal Current Biology. The study suggests that dyslexic people may have trouble moving quickly from what they read to what they hear. Doctor Harrar calls this a "sluggish shifting of attention across the senses."

    "So, if you are trying to read something and then trying to listen to somebody who's reading aloud and you're trying to follow along with what they are reading -- they have to switch their attention from hearing what they are saying to looking at the piece of paper and back again. So we found they have quite sluggish shifting of attention across the senses," said Harrar.

    In the study, Doctor Harrar tested 17 people with dyslexia, and 19 others without reading problems. The volunteers were asked to push a button as quickly as possible when they heard a sound, saw a light or experienced both together. Doctor Harrar compared the speed of their reactions.

    She found that people with dyslexia were just as fast as the others when they saw only a picture or heard only a sound. But the dyslexics had a slower reaction time when they heard a sound and saw a picture at the same time.

    Doctor Harrar feels like playing action video games could help dyslexic people shift from seeing to hearing more quickly. She adds that images in video games force the eyes to move and focus quickly.

    "Video game types of things pop out of here and there, they move your eyes around the screen quite quickly in response to things quite quickly, and the more you play a video game the faster you get that kind of thing. So, the video game is really training the attention system to move quickly," said Harrar.

    The study also shows that dyslexic people have the most difficulty going between what they saw and what they heard, this may have an effect on how dyslexic children are taught how to read.

    When children learn the alphabet, they usually see the letter first and then hear the sound, or they see and hear the letter at the same time. The study shows that dyslexics might learn more quickly if they hear the sound of a letter or word first before seeing it.

    I grew up with a fat dad 450 pounds at his heaviest. Every week he would try a new diet, and my family ended up eating whatever strange food he was trying at that moment.

    After my third-grade year, my dad landed a life-changing job in Manhattan. My mom, my little sister and I had to move away from our hometown, Chicago, and leave my grandmother and her beautiful food behind.

    Leaving my grandmother was far more frightening than the move to New York City.  There would be no more special weekends at my grandmother's house, the only place I can remember feeling happy, safe and nourished (有营养的). It was what I desired. In this new city, I felt extremely alone and lost, and I missed my grandmother terribly.

    My grandmother knew just how I felt. And she knew the cure. Every week, she would send me a card with a$ 20 bill, a recipe and a list of what to buy at the market. It kept us bonded, and her recipes filled my body and soul.

    Over the years, I have grown to better understand my father's struggles with weight and the toll (代价) it took on him and those who love him. I have come to realize he was driven not by vanity (自负) or selfishness as much as by a deep pain, I  And in spite of growing up in such an unhealthy eating environment ( or perhaps be-cause of it), as an adult I found a passion and a career as a nutrition consultant.

    Today, my father weighs 220 pounds and is a vegan(素食者). How he got there is a story I hope to share in the coming weeks. More importantly, food is no longer a barrier that keeps us apart, but a bridge that keeps us connected. There is nothing my dad enjoys more than talking with me about dietary theories and his weightloss victories. And now I am the one regularly sending recipe cards to my father s house, just as my grandmother did for me.

    I fondly remember road trips as a child, sitting in the sunny backseat of my mom's car, daydreaming about other worlds and fantastic adventures. As I've grown older, my daydreams have become increasingly occupied less with fantasy but more with the reality of my past and future. Nearly everyone daydreams about their future and reflects nostalgically (念旧地) or negatively on moments of the past. These moments can provide inspiration, but if you spend too much time daydreaming in this fashion, you may be reducing your success in the present.

    If you've ever planned a vacation, you're familiar with the impatient days tapping at your desk, dreaming of the lazy, relaxing days to come. Unfortunately, sometimes you end up comparing the real vacation to your imagined one, and it doesn't live up to the standard. Reflecting nostalgically on the past can also prevent present enjoyment. It is equally fun to reflect on past achievements or fun events, but it's possible to be so consumed with happy memories that you miss opportunities to create more.

    We've all made mistakes that we're ashamed of; reflecting on them is an important step in correcting those mistakes and becoming a better person. But dwelling（细想）too long on your past can also be negative. If you dwell too long on a past mistake, you can begin to equate（使等同）yourself with your past and feel farther away from the person you want to be. Train your brain to think quickly about the past and future, and take only the information and inspiration that you need in order to be the best person you can without resting on your glory moments or your mistakes.

    If your identity is not dependent on the past or future, every experience is new and every day is a blank page for you to write. A fun mental exercise is to always tell yourself that you're experiencing things for the first time. So take advantage of each moment you're given.

    In March 2008, I told my friends: I was going to shut down my law practice and travel around the world in a year. What's more, I'd do it without taking any flights or making a single advance (预先的) reservation. Some friends offered support and encouragement, while others were doubtful. Once I'd said the words, there was no turning back. It took months to shut down my law practice and get things in order.

    There really wasn't any great reason why I wanted to circle the world. I simply wanted to do something fun and different. When I had this plan, I didn't plan for it to lead to a life on the road forever. I was planning to come back, open a new law practice and write a hugely successful book about my travels. Before I left, I started a travel blog, which served as a way to take notes for the book.

    Once I set off on my trip in December 2008, I found that travelling without using planes was not easy. It took seven days and nights on trains to get from Moscow to Beijing. Sometimes, I wouldn't see a village or a human being for 10 hours. I had a whole cabin to myself from the second day of that journey.

    It turned out that travelling with no reservations was far less difficult than I had imagined. Pulling into a city on a bus with a bag, looking in a guidebook for a few suggestions of accommodations (住宿), and then finding an empty room was never a problem.

    Soon after I started this adventure, I realised that my return to the US would be temporary (暂时的). About three months into my journey, I realised that I didn't want to go back to my old life. The world is so wonderful and I wanted to see as much of it as I could.

The Mona Lisa is one of the most famous paintings in the world. Painted by Leonardo da Vinci in the early 16th century, it has captivated audiences for centuries with its mysterious smile and masterful technique. 

The painting is housed in the Louvre Museum in Paris, France, and attracts millions of visitors each year. However, the Mona Lisa's history is not without controversy. There have been numerous attempts to steal or deface the painting, and its conservation has been a subject of great concern.

Leonardo da Vinci's use of sfumato, a technique that blends colors and tones seamlessly, gives the painting a soft and hazy appearance. The sitter's expression, which seems to change depending on the viewer's angle and mood, adds to the intrigue of the work.