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。

    Green is an important color in nature. It is the color of grass and the leaves on trees. It is also the color of most growing plants.

    Sometimes, the word “green” means young, fresh and growing. For example, a greenhorn is someone who has no experience. In the 15th century, a greenhorn was a young cow or an ox whose horns(角)had not yet developed. A century later, a greenhorn was a soldier who had no experience in war. By the 18th century, a greenhorn had the meaning it has today—a person who is new in a job.

    Someone who is good at growing plants is said to have a green thumb(大拇指). The expression comes from the early 20th century. A person with a green thumb can make plants grow quickly and well.

    Green is also the color used to describe the powerful feeling , jealousy(嫉妒). The green-eyed monster （怪物）is not a dangerous animal from outer space. It is an expression used about 400 years ago by the British writer William Shakespeare in his play “Othello”. It describes the unpleasant feeling when someone has something he wants. For example, a young man may suffer from the green-eyed monster if you get a pay rise and he does not.

    In most places in the world, a green light means to move ahead. In everyday speech, a green light means agree to continue with a project.

    Below are some best special interesting holidays─all are new for 2017 and have high quality guides or tutors and strong programmes.

    Holland in bloom river cruise (巡游) with Alan Titchmarsh

    Alan Titchmarsh is the star attraction on this river cruise. Alan joins you for a visit to the magnificent Keukenhof Gardens─home to 800 varieties of tulips (郁金香).The Telegraph's gardening expert will talk about the best new varieties and the garden's history.

    April 19, £1,495 including flights from the UK and some meals. Telegraph Tours (0161 236 2444; telegraph.co.uk/titchmarshtour).

    Morocco Sketchbook

    Led by artist Maxine Relton, this tour takes in Marrakesh helping you develop your drawing skills. Rapid line and figure drawing and colour mixing are all covered and the eight-day holiday is based in Kasbah du Toubkal.

    May 8, £2,495 including some meals. Steppes Travel (01285 601 495; steppestravel.co.uk).

Ballroom and Latin American dancing in Tenerife

    This travel provides daily dance tuition with David Bowie who'll be on hand to teach dancing techniques. It is aimed both at the beginners and more experienced dancers looking to improve their skills. There'll also be time to explore the island on foot or play a round of golf.

    April 26, £769 full-board. Saga (0800 096 0084; travel.saga.co.uk).

    Fishing in Northern Argentina

    This nine-day fly fishing and conservation tour takes in the Iberá Marshlands, the world's second largest wetlands. Here expert fisherman, Charles Jardine, is the guide as you fish. Based in Estancia Rincon del Socorro, the holiday also includes opportunities for horse riding and bird-watching.

    October 15, £5,095 full-board. Cazenove + Loyd (02038135082; cazloyd.com).

    The bus was full of the sounds of laughing and yelling fifth graders. They were on their way to the zoo for a class trip. Mario was excited to see the zoo, but there was one problem. It was ten o'clock in the morning, but his stomach was already grumbling(咕咕叫). He reached down and grabbed his lunch bag. Opening it, he saw that it contained a peanut butter and jelly sandwich, an orange, and two cookies. Mario sighed. He always had peanut butter and jell.

    “Trade you lunches,” he said to the boy seated next to him on the bus．

    “Okay,” said Mark as he handed his brown bag to Mario．

    Mario opened it and was hit with the smell of tuna(金枪鱼). Mario wrinkled his nose and quickly closed the bag. He leaned forward and tapped the shoulder of the girl in front of him.” Swap lunches, Toni?” he asked．

    “Hmm, okay,” said Toni．

    Mario smiled. This was fun. But when he looked into the bag, he frowned. What a disappointment! A ham sandwich, but no cookies! He had to have cookies．

    Mario turned in his seat. “Want to trade lunches?” he asked Juana．

    “Definitely!” said Juana. She grabbed his lunch and tossed hers onto his lap．

    He opened the lunch bag. Pizza! He reached into the bag to grab it. Oh, no! The pizza was hard. He could hit a home run with pizza that hard.

    Mario twisted in his seat. One last try, he told himself. “Hey, Mona! Trade lunches?”

    Three rows behind him, Mona seemed hesitant: Finally, she nodded. She passed her lunch forward, and he passed his back．

    Mario took a deep breath and opened the bag. It was a peanut butter and jelly sandwich, an orange, and two cookies. The sandwich was a little squashed(挤压), and one of the cookies was broken.

    Mario ate it anyway. And it was delicious.

    It is not easy to become a doctor in the United States. The first step is getting into a medical college. More than one hundred and twenty American schools offer study programs for people wanting to be doctors.

    People can get advice about medical schools from many resources. One of these is the Princeton Review. The publication provides information about colleges, study programs and jobs.

    The Princeton Review says the competition to enter medical schools is strong. American medical schools have only about sixteen thousand of openings. But more than thirty-two thousand students may try it. Many of those are women.

    Most applicants contact more than one medical school. Some contact many. An important part of the application usually is the Medical College Admission Test which is called MCAT. The Association of American Medical Colleges provides the test by computer. It is offered in the United States and other countries.

    The people who want to enter medical schools are rated（评定）on reasoning, physical and biological sciences and an example of writing. Applicants for medical schools need to do well on the MCAT. They also need a good record in their college studies.

    Some students work for a year or two in a medical or research job before they attempt to enter a medical school.

    On Wednesday, January 13th, I performed on stage for the first time. As someone who takes part in so many activities, it's extremely difficult to find the time to be a part of any production. For me, it was a once-in-a-lifetime opportunity to try acting through the Senior Play Project.

    Auditions (试镜)came first. They weren't particularly difficult, more to see who may be a better fit tor certain roles. We were told our roles in the various plays, and started to work immediately.

    I was unsure of how I was as an actor, and I had to learn a lot fast: actions, my place in the story, my reactions, and countless other small details... As I began to improve as an actor, I was able to understand my characters better.

    My first character is a man named Roger who is a senior advisor to a presidential candidate in a play called "The Spot." He's a short-tempered guy who says what he wants and takes what he wants to assist his candidate in today's tough political races. He's on the set of The Spot, an advertisement for the candidate, to make sure everything runs smoothly and that any problems are dealt with quickly and efficiently.

    While I had really interesting characters, and the plays were funny and such a great experience to act in, I really love the Senior Play Project for the people. I worked with 12 other seniors who not only loved what they were doing, but offered help and advice throughout my entire learning process.

    Between the lights, sounds, costume and makeup, and plenty more, theatre is a team sport just like basketball or baseball. There are no small parts; there is no one who isn't needed. I've learned to appreciate live theatre, and the effort that every person in the show, both onstage and offstage, puts into it.

    American families are accustomed to settling in faraway places, which has been a national phenomenon. Decades of data, including a more recent Gallup study, characterizes the US as one of the most geographically mobile countries in the world. "About one in four US adults(24 percent) has reported moving within the country in the past five years." the reported noted. With the exception of Finns(23 percent) and Norwegians(22 percent), Americans move considerably more than their European peers.

    Though some may move for love or family, the major reason why Americans choose to move around is, unsurprisingly, related to work. Citing data from the Current Population Survey, a post on the blog of the New York Fed noted that between 1998 and 2013, "slightly more than half of interstate(州际的) migrants said they moved for employment­related reasons—a category that includes moves undertaken for new jobs, job transfers, and easier commutes(通勤)."

    The seeking of opportunity, particularly for an immigrant nation, is a national mythology(神话) as well as an emotional attachment to work. A new working paper analyzed by Ben Steverman at Bloomberg suggests that workers in the US now" put in almost 25 percent more hours than Europeans" in a given year. This figure has steadily risen since the 1970s, when the hours logged by workers in Western Europe and the US were roughly the same.

    There are, of course, some internal factors. The US is much vaster than most European countries, plus it boasts(拥有) a common language. It is considered to be a sign of an efficient labor market that US workers can be persuaded to move to regions where there is a steady growth in jobs, such as the Sun Belt in recent years. And while American workers often have fewer labor protections than their European counterparts, as a report by the World Bank noted in 2012, American "labor laws give employers the power to fire, hire, or relocate(重新安置) workers according to their needs", a flexibility that is thought to aid economic growth. The World Band report added that the occupation of the average US employee in 2006 was 4 years, compared to 10 years in the European Union.

    Nevertheless, while Americans remain excessively mobile, FaithKarahan and Darious Li at the New York Fed are the latest to note that US workers are moving around less than before. During the 1980s, 3 percent of working­age Americans relocated to a different state each year; that figure had been cut in half by 2010." While part of the decline can be attributed to the Great Recession," the authors suggest," thisphenomenon took place over the course of several decades and is not necessarily related to the economic conditions."

    So what accounts for this phenomenon? A round­up of theories by Brad Plumer at The Washington Post included the aging of the US workforce, the further rise of two­income households, the burdens of real estate, evolving workplace culture, as well as the flat line of wages, which makes moving away for a job, on average, a less rewarding financial proposition.

    Karahan and Li put much stock in the effects of an aging workforce, to which they attribute at least half of the decline in interstate migration. "In short, a young individual today is moving less than a young person did in the 1980s because of the higher presence of older workers," they write, suggesting that employers have shifted their employment tactics(策略) to adapt to the changing demographics(人口统计数据) of the workforce. Needless to say, movies about this era in American life, in which fewer people set out to start lives in wide­ranging places, will probably be much less exciting.