阅读理解，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。

　　Does stress cause gray hair? Many people believe that tension and stress can cause your hair to lose its color．In fact, it is an old wives tale that being upset all the time can result in premature graying．Here is a closer look at this situation and why some believe that this old wives tale could be true．

　　As one ages, the hairs on the head also age．In fact, just about everything on the human body begins to show signs of wear and tear after a while．The joints wear and become stiff and skin wears and becomes wrinkled．Hairs on the head grow and eventually die．They are replaced, but in the process something else happens．

　　When new hairs are replaced, the color or pigment(色素)is also added to them．However, as one ages, this pigment becomes less and less available．At first, hairs will have a limited amount of pigment and they will appear to be grayish in color．In time, they will lose all of their pigment and will be white．Many things are known to cause graying．and genetics is a very powerful factor．If one of your parents turns gray at an early age, there is a good chance that you will too．Some people begin the graying process in high school, while others may be over the age of forty．

　　Constant worry and tension can have many harmful effects on the human body．It is a known fact that stressful times can cause one to suffer hair loss．It would make sense that if it can cause these problems, perhaps it also may contribute to graying．However, there, is no sound evidence to support this．

　　On the other hand, many medical professionals believe that there may be a link：between graying and a constant state of anxiety or, tension．Does stress cause gray hair? There is no scientific evidence to support the theory, but it is best to avoid stressful situations．

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阅读理解，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。

　　Yesterday I went to our local grocery store．I often go to their deli counter．and I understand that it can get a little confused for the workers．So normally none of them ever take the time to smile or seem overly friendly．But yesterday it was completely different．I was pleasantly surprised to be greeted with a very welcoming smile by the young man behind the counter．He never sighed heavily or slumped back and forth like he didn't want to be there．He was all by himself and quite a long line．But not once did he act concerned about it．He just did his job efficiently anti acted very kind the entire time．

　　I was so impressed that I approached the manager．I explained to her that I often visit the deli counter and I have never been greeted with such kindness．She agreed with me that he was a wonderful person and she thanked me for sharing my feelings with her．

　　As I was walking away, I could hear her approaching the young man with, “I just got a wonderful compliment(praise)about you．”I couldn't hear everything she was saying, but I knew that she did thank him．I couldn't help but smile!

　　Later I had to pass by the deli counter to get onions．There was no one there, except the diligent young man．He didn't say anything, he just smiled at me．I realized that I hadn't done a huge deed that day, but that small deed made a small difference to someone．I love seeing people smile．I just received my smile cards and I wish I had one with me that day．Maybe I will drop one off at the deli a different day! It's amazing how good I felt after that．

　　So, friends, the next time you are in a grocery store, retail store, restaurant, or anywhere that someone is working hard, letting them know in some way can mean so much．I hope you get a smile out ofit like I did!

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阅读理解，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。

　　How often do you sit still and do absolutely nothing．The usual answer these days is“never”．or“hardly ever”．As the pace of life continues to increase, we are fast losing the art of relaxation．Once you are in the habit of rushing through life, being on the go from morning till night, it is hard to slow down．But relaxation is essential for a healthy mind and body．

　　Stress is fl natural part of everyday life．There is no way to avoid it, since it takes many and varied forms-driving in traffic, problems with personal relationships are all different forms of stress．Stress, in fact, is not the“baddy”it is often reputed to be．A certain amount of stress is vital to provide motivation and give purpose to life．It is only when the stress gets out of control that it can lead to poor performance and ill health．

　　The amount of stress a person can withstand depends very much on the individual．Some people are not afraid of stress, and such characters are obviously prime material for managerial responsibilities．Others lose heart at the first sight of unusual difficulties．When exposed to stress, in whatever form, we react both chemically and physically．In fact we make a choice between “fight” or “fright” and in more primitive days the choice made the difference between life and death．The crisis we meet today are unlikely to be so extreme, but however little the stress, it involves the same response．All the energy is shifted to cope with the stress．It is when such a reaction lasts long, through continued exposure to stress, that health becomes endangered．Such serious conditions as high blood pressure and heart disease have established links with stress．

　　Stress in some people produces stomach disorders, while others experience tension headaches．Since we cannot remove stress from our 1ires, We need to find ways to cope with it．

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阅读理解，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。

　　A baby born in India has been declared the world's seven billionth person by child rights group Plan International．Baby Nargis was born at 07：25 local time(01：55GMT)in Mall village in India's Uttar Pradesh state．Plan International says Nargis has been chosen symbolically as it is not possible to know where exactly the seven billionth baby is born．In addition to baby Nargis in India, Bangladesh, the Philippines and Cambodia have all identified seven billionth babies．The United Nations estimated that on Monday 31 October．the world's population would reach seven billion．

　　Populations are growing faster than economies in many poor countries in Africa and some in Asia．At the same time, low birth rates in Japan and many European nations have raised concerns about labor shortages．

　　Population experts at the United Nations estimated that the world reached six billion in October 1999．They predict nine billion by 2050 and ten billion by the end of the century．China's population of one and a third billion is currently the world's largest．India is second at 1.2 billion．But India is expected to pass China and reach one and a half billion people around 2025．

　　India will also have one of the world's youngest populations．Economists say this is a chance for a so-called．demographic dividend．India could gain from the skills of young people in a growing economy at a time when other countries have aging populations．But economists say current rates of growth, although high, may not create enough jobs．Also, the public education system is failing to meet demand and schooling is often of poor quality．Another concern is health care．Nearly half of India's children under the age of five are malnourished(营养不良)．

　　Michal Rutkowski, the director of human development in South Asia at the World Bank, says reaching seven billion people in the world is a good time for a call to action．He says, “I think the bottom line of the story is that the public policy needs to become really, really serious about sex equality and about access to services－to fight against malnutrition, and to provide for access to health services, water and schooling．”

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阅读理解，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。

　　Like any good mother, when Karen found out that another baby was on the way, she did what she could to help her 3-year-old son, Michael, prepare for a new baby．They find out that the new baby is going to be a girl, and day after day, night after night, Michael sings to his sister in Mommy's stomach．

　　Finally, Michael's little sister is born．But she is in serious condition．With alarm in the night, the ambulance rushes the infant to the neonatal(初生的)intensive care unit at St．Mary's Hospital, Knoxville, Tennessee．The days go by．The little girl gets worse．The pediatric(儿科的)specialist tells the parents, “There is very little hope．Be prepared for the worst．”

　　Karen and her husband contact a local cemetery about a burial plot．They have fixed up a special room in their home for the new baby, but now they plan a funeral．Michael, keeps begging his parents to let him see his sister, “I want to sing to her, ”he says．

　　Karen makes up her mind．She will take Michael whether they like it or not．If he doesn't see his sister now, he may never see her alive．

　　She dresses him in an oversized suit and marches him into ICU．He looks like a walking laundry basket, but the head nurse recognizes him as a child and shouts, “Get that kid out of here now! No children are allowed．Never disturb patients here．”The mother rises up strongly and said, “He is not leaving until he sings to his sister! ”

　　Karen leads Michael to his sister's bedside．He gazes at the tiny infant losing the battle to live．And he begins to sing．In the pure hearted voice of a 3-year-old, Michael sings：“You are my sunshine, my only sunshine, you make me happy when skies are gray…”Instantly the baby girl responds．The pulse rate becomes calm and steady．

　　The next day, the very next day, the little girl is well enough to go home! Woman's Day magazine called it“the miracle of a brother's song．”The medical staff just called it a miracle．Karen called it a miracle of God's love!

　　Never give up on the people you love．

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阅读理解，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 America, Virginia Beach has all the elements of a classic seaside resort：brilliant beaches, a lively boardwalk, plenty of restaurants and nightspots, and amusement rides sure to appeal to kids．Many believe Virginia Beach is at its best in the off-season, when the town is less crowded but the weather is still mild．

　　Meanwhile, some safety tips should be followed, enjoying the happiness and excitement the beach offers．

　　The number l safety tip concerns ocean safety：pay attention to Flag conditions posted on the lifeguard stands．Lifeguards post a red flag to warn when the ocean water is dangerous．Take them seriously! Tourists from land-locked regions are particularly easily attracted by the magic of the waves．However, a calm ocean can become risky without warning．Make sure you swim near a lifeguard．Swimming without lifeguard protection is almost five times as great as drowning at a beach with lifeguards．

　　Never swim alone．Many drownings involve single swimmers．When you swim with someone else, if one of you has a problem, the other may be able to get help, including signaling for assistance from others．

　　Don't fight the current．The facts show that some 80％ of rescues by lifeguards at ocean beaches are caused by currents．These currents are formed by surf and gravity, because once surf pushes water up the slope of a beach, gravity pulls it back．This can create concentrated rivers of water moving offshore．If you are caught in a rip current, don't fight it by trying to swim directly to shore．Instead, swim parallel to shore until you feel the current relax, then swim to shore．Most rip currents are narrow and a short swim parallel to shore will help bring you to safety．

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阅读理解，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。

　　Batteries are included, but the charger's not．The Nokia E-Cu concept phone doesn't need to plug in, it charges from any heat source．Designer Patrick Hyland says it can even work off the warmth of your pocket．The first time “it would take approximately seven hours to reach full charge, then after that it's continuously charging by keeping the phone in areas between 86 degrees and 104 degrees Fahrenheit．” That's one hot pocket．?

　　He's put a thermogenerator(热偶电池)inside the phone that transforms heat into electric potential energy．To better conduct the heat to that little power plant in your pocket, the E-Cu(E for energy, Cu for copper)is coated by copper backing with heat sinks like those normally used to keep electronics from overheating．

　　Nokia doesn't have current plans to build the phone, so for now it remains a concept．But Hyland says he's open to anyone who wants to cooperate．

　　For Americans this technology would certainly be convenient．It would also save a bit on energy bills and waste．“Annually, unwanted phone chargers produce 51, 000 tons of waste in addition to the greenhouse gases created by the production of the electricity needed to charge them, ” Hyland says．So a charger-free phone is also a green phone．Though adapting our plug?in habits would help a group of people, most cell phone related energy use comes from leaving your charger plugged in all day unnecessarily．

　　The real potential for charger-free cell phone technology is what it could enable places where plugging in isn't an option, like rural areas in the developing world．

　　Cell phones are spreading faster than power lines and bringing with them countless opportunities, aid and health advances．A phone like the E-Cu, if it ever comes to be, would enable all manner of expanded aid and development by phone projects．Let's hope Patrick finds a partner．

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阅读理解，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 television news feature about Ben Heckmann, an eighth grader from Farmington, Minn．, was breathless in its praise．“At 14, he has accomplished something many adults can't achieve, ” the reporter said．“Ben is a twice-published author．” But Ben's two “Velvet Black” books, describing a fictional rock band, were not picked from a pile of manuscripts(手稿)by an eagle eyed publisher．They were self-published, at a cost of ＄400 by Ben's parents．

　　Over the past five years, print-on-demand technology and a growing number of self?publishing companies whose books can be sold online have inspired writers of all ages to avoid the traditional gatekeeping system for determining who could call himself a “published author．”

　　The mothers and fathers who foot the bill say they are simply trying to encourage their children, in the same way that other parents buy equipment for a promising baseball player．But others see self-publishing as a lost opportunity to teach children about hardship and perseverance．Mr Robbins, a critic, thinks it is wonderful to start writing at a young age, but worries self-publishing sends the wrong message．“There are no prodigies(神童)in literature, ” he said．“Literature requires experience, in a way that mathematics and music do not．” Alan Rinzler, a publishing industry veteran, suggested parents hire a professional editor like him to work with their child to tear a manuscript apart and help make it better．

　　Ben's father, Ken, said Ben's ambitions “weren't to knock Harry Potter off the list, ” but “to get that good feeling inside that you’ve done something．”

　　Ajla Dizdarevic, 12, who has self?published two books of poetry, has been on television and in local newspapers．Being a published author, she said, “was always a dream of mine．” Her new dream： three books by age 15．

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阅读理解，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。

　　Virginia is set to begin enforcing the toughest drunken-driving punishment, one that will require thousands of first-time offenders-whether they were highly drunk or slightly over the limit-to install(安装)in their cars blood-alcohol testing devices that can lock the ignition．The devices work like this-A driver must blow into a blood alcohol device linked to the car's ignition．If the result is higher than the legal limit, the car will not start．The device also requires random “rolling retests” once the driver is on the road．

　　Virginia's current law requires only repeat drunken-driving offenders or those with a blood alcohol level of 0.15 or higher to have an ignition interlock device in their car．

　　The new law, which takes effect in July, will roughly increase the number of people required to use ignition interlock devices four times, and offenders will have to pay about ＄480 for a typical six-month installation．

　　The measure has caused a debate between groups battling drunken driving and those representing offenders．Such groups as Mothers Against Drunk Driving and the Washington Regional Alcohol Program say that Virginia's 274 alcohol-related road deaths and more than 5, 500 injuries in 2010 remained unacceptably high despite years of cracking down on drunken driving．Ignition interlock devices, they say, reduce repeat offenses．But some public defenders and lawyers argue that the devices are too severe a punishment for offenders at the legal blood alcohol limit of 0.08, and that the court system will be burdened by more cases going to trial and lower-income drivers will be affected by the fees．

　　Del．Sal R．Iaquinto, who sponsored the bill, had a simple reply for concerns about the costs of the interlock devices： “How much does a life cost? ” “Blowing into a tube for six months, you will remember that, ” Iaquinto said．“And you?re not likely to offend again．”

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阅读理解，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。

　　When Russell Lyons volunteered for the first time, he read “Goodnight Moon” to a class of San Diego preschoolers．And it wasn't reading－he'd memorized the book and was reciting it out loud．He was 4．Still, he said it felt good up there, in front of the other kids, lending a hand．He wanted more of that feeling．

　　Thirteen years later, he's getting a lot of it．He's on a five-month road trip across America-not sightseeing, but volunteering．

　　The University City resident has spent time at an animal reserve in Utah, a women's shelter in St．Louis, a soup kitchen in New York, a retirement home in Tucson．This week he's in Los Angeles, at a program that supports disabled youth．

　　“I just like helping people and feeling that something I do is making a difference, ” he said．He resists the idea that his “Do Good Adventure” is all that unusual．It bothers him that the media often describe young people as lazy, self-centered and materialistic．So he sees his trip as a chance to make a statement, too．“About 55 percent of teens do volunteer work, higher than the rate for adults, ” he said, according to a 2002 study．“Not everybody knows that．”

　　Of course, some teens do volunteer work because it looks impressive on their college applications．Lyons said he mentioned his trip on his submissions．But charity work is a habit with him．Even before the cross?country trip, he was volunteering about 200 hours a year at various places．He's made sandwiches for homeless families in Washington D．C．He's taught math to fifth-graders in Cuernavaca, Mexico．

　　He gets some of that drive from his mother, Leslye Lyons, who has been involved in nonprofits for much of her life．She was there when her son “read” to the preschoolers-a memory of hers “that will never go away．”

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