There is an English saying that “Laughter is the best medicine.” Until recently, few people took the saying seriously. Now however, doctors have begun to look into laughter and the effects it has on the human body. They have found that laughter can really improve people's health.

    Tests were carried out to study the effects of laughter on the body. People watched funny films while doctors checked their hearts, blood pressure, breathing and muscles. It was found that laughter has similar effects to physical exercise. It increases blood pressure, makes the heart beat quicker and makes people breathe deeper; it also works on several groups of muscles in the face, the stomach, and even the feet. If laughter exercises the body, it must be beneficial.

    Other tests have shown that laughter appears to be able to reduce the effects of pain on the body. In one experiment doctors produced pain in groups of students who listened to different radio programs. The group that tolerated（忍耐）the pain for the longest time was the group which listened to a funny program. The reason why laughter can reduce pain seems to be that it helps to produce a kind of chemical in the brain which diminishes both stress and pain.

    As a result of these discoveries, some doctors in the United States now hold laughter clinics, in which they help to improve their patients' condition by encouraging them to laugh. They have found that even if their patients do not really feel like laughing, making them smile is enough to produce beneficial effects similar to those caused by laughter.

    “I would say, no matter what people tell you, anything can happen.” That's the message Internet singer Austin Mahone says at We Day, an event for young people in Canada.

    When he was 14，Austin and a friend began uploading pop songs to musical websites.“I was just doing it because we had nothing to do, living in a small town.”

    “I'd check different websites for the hottest songs, and I'd record my own videos,” he explains. “That's how people began to find me online.”His videos got millions of hits and he signed with a record company. The result was the release of Austin's first album, Junior Year. While it seems like a sudden rise for the teenager, Austin admits the early days were not always fun. He says a lot of people thought badly of him for posting his videos online. Yet this didn't put him off.“I kept working hard. ”And the hits on his videos kept coming.

    Austin's achievement and spirit make him a perfect fit for the message of We Day. After all, Free the Children, the creator of the event, was founded to “enable youth to make changes.” Even Austin's unusual rise by way of the Internet fits with the way Free The children works and raises money.

    Because of Austin, his four million followers will learn about Free the Children. While Austin's presence certainly helps We Day, it's good for him, too. Austin gets to show himself as someone who volunteers his time and talent for a worthy cause and show that he cares about making the world a better place.

    Where can you go to listen to important people talk about important subjects? BigThink.com is a new website that allows Internet users to discuss certain topics with world experts. Subjects discussed on BigThink include the environment, music and questions about happiness and personal identity. The website has been called a YouTube for thinkers. Victoria Brown and Peter Hopkins created BiThink.com They said that people needed an international place to communicate with each other and discuss the important issues (话题)of our times. On the BigThink website, when you click on (点击)a subject, you will find a video of a person talking about his or her ideas. For example, you can listen to United States Senator Ted Kennedy talking about education and other things. Besides, you can read the comments(评论) and questions written by other visitors to the website. More than one hundred experts have expressed their ideas on the website. BigThink's creators started the website by first getting famous people to agree to be videoed. They began by interviewing several well-known professors from Harvard University. Then they used the names of these professors to gain the trust of others and get them to take part in the project. The website says BigThink belongs to everyone. Its motto(格言) is: "We are what you think." So, go online and start thinking big.

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。

    The ancient city of Xi'an in China holds many treasures. And last month, archaeologists working there made an important discovery—a buried palace built in the third century B.C. to honor China's first emperor.

    The entire palace measures roughly 2,260 feet long by 820 feet wide. It includes 10 courtyard houses and one main building. Archaeologists found bricks and pieces of pottery at the site of the palace, as well as the remains of walls and roads.

    The palace is part of the massive burial complex of Emperor Qin Shihuangdi. He conquered seven warring kingdoms and united ancient China in 211 B.C.

    Qin Shihuangdi wanted his legacy, or accomplishments, to be remembered forever. So he hired more than 700,000 workers to build his funeral complex in Xi'an. It represents a miniature version of his vast kingdom.

    The complex also includes the world-famous terra-cotta army, a collection of more than 8,000 life-size clay statues. These sculptures represent soldiers, acrobats, and horses from the Qin Dynasty (221 B.C.-206 B.C.). Scientists have not yet found all these terra-cotta warriors, even though they discovered more of the statues last summer.

    Farmers discovered the complex by accident in 1974. Since then, scientists studying the site have learned a great deal about life in ancient China. But much of the emperor's tomb has yet to be dug up, or unearthed. Many of the artifacts (objects from the past) are so old that scientists cannot preserve them.

    "Archaeologists fully acknowledge that nobody in the world has the technology (to safely dig up Xi'an's treasures) yet," explains Kristin Romey, an expert on Chinese archaeology.

    But as technology improves, archaeologists will keep digging to uncover the rest of the wonders that still lie buried in Xi'an.

    "It's one of the most important archaeological discoveries that's waiting to be made," says Romey, "and we know where it is."

    If you cannot afford to travel in any class above economy, flying generally sucks, either a little or a lot, depending on your tolerance level. But it especially sucks if you are too wide for the airline's design.

    Just getting to your seat can be a challenge, as your hips (臀部，髋) bounce from seat to seat on each side of the aisle (过道). If someone is standing up to put things in the overhead locker, there is a decision to be made about whether it's worth trying to squeeze past. Everything is just slightly too small: the seats, the overhead lockers, even the bathrooms—and those, it seems, are getting even smaller.

    The Washington Post recently reported that, on some newer planes flown by American, Delta and United airlines, the bathrooms in economy class are just 61cm wide: about 25cm narrower than the average portable toilet, and roughly the width of the average dishwasher. Your face might be the only thing you can poke in there comfortably—which makes it a poor design, considering what a passenger is likely to need the bathroom for.

    According to the manufacturer, these "Advanced Spacewell" bathrooms make space for six additional passengers, which is great for the airlines' financial bottom line. But what about the other bottom line? Concerning, well, bottoms that can't fit into their planes' bathrooms?

    As bodies get bigger and aeroplane spaces get smaller, the wide among us have come up with solutions. Armrests that turn us into sausages (香肠) can be pulled up, or slowly encased (围住，包起) into the soft flesh of our sides until we go numb (麻木). We can ask the flight attendant to get us a seat-belt extender, if security has confiscated the one we brought with us, as can sometimes happen. But squeezing into a tiny toilet and closing the door behind us? Not workable.

    Unlike the impossible task of squeezing down the aisle to your seat, or the side-to-side dance necessary to get big hips past the armrests, fitting into a space just 61cm wide is not just a challenge—it is almost impossible. It is not like missing out on an option for the in-flight meal—a bathroom is as essential as a safety-compliant seat belt, or the air that is pumped in to the cabin (飞机舱). If airlines are not willing to make space for us, bigger passengers may have no option but to reconsider booking a flight at all.

    Jane Austen is loved mainly as a charming guide to fashionable life in the Regency period (英国摄政时期). She is admired for describing a world of elegant houses, dances, servants and fashionable young men driving barouches (四轮四座大马车). But her own vision of her task was completely different. She was an ambitious and strict moralist. She was highly conscious of human failings and she had a deep desire to make people nicer: less selfish, more reasonable and more sensitive to the needs of others.

    In Pride and Prejudice, Mr. Darcy and Elizabeth Bonnet start off heartily disliking each other and then, gradually realize they are in love. They make one of the great romantic couples. He is handsome, rich and well connected; she is pretty, smart and lively. But why actually are they right for one another?

    Jane Austen is very clear. It's for a reason we tend not to think of very much today: It is because each can educate and improve the other. When Mr. Darcy arrives in the neighborhood, he feels "superior" to everyone else, because he has more money and higher status. At a key moment, Elizabeth condemns his arrogance (自大) and pride to his face. It sounds offensive in the extreme, but later he admits that this was just what he needed.

    Mostly, we tend to think of love as liking someone for who they already are, and of total acceptance. But the person who is right for us, Austen is saying, is not simply someone who makes us feel relaxed or comfortable; they got to be able to help us overcome our failings and become more mature, more honest and kinder—and we need to do something similar for them.