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。

    There are many useful suggestions that can help one to improve English. Here are some of them to increase one's English language vocabulary.

    Learning English vocabulary is about much more than just learning the right words. It is based on understanding important words and expressions.

    Learning a word will not help very much if you quickly forget it. Researches show that it takes from 10 to 20 repetitions(重复) to really make a word part of your vocabulary. Since most words are learned from how they are used in context (上下文), the more words one is shown, the better vocabulary one will have. Keep a piece of paper close to you. When you read, pay close attention to the word you do not know, write the word down and try to understand its meaning from the context. Then look up the word in a dictionary. 

    Remember that if you do not use English words that you have just learned in conversation or writing, you will forget them very quickly. So the best way to learn new words effectively is just by trying to use them in conversation and writing. Remember also that practice is the key to fluent spoken English.

    Building vocabulary is a life-long task. Remember: ＂In the beginning was the word.＂ Your future could depend on how rich your vocabulary is. It will also determine the quality of your communication.

    MOOC, a massive(大规模的) open online course, aims at providing interactive discussion and open access via the web. In addition to traditional course materials such as videos, readings, and problem sets, MOOCs provide interactive user forums (论坛) that help build a community for the students, professors, and teaching assistants.

    MOOCs first made waves in the fall of 2011, when Professor Sebastian Thrun from Stanford University opened his graduate-level artificial intelligence course up to any student anywhere, and 160,000 students in more than 190 countries signed up. This new kind of online classes is shaking up the higher education world in many ways. Since the courses can be taken by hundreds of thousands of students at the same time, the number of universities might decrease greatly. Professor Thrun has even imagined a future in which there will only need to be 10 universities in the world. Perhaps the most impressive thing about MOOCs, many of which are being taught by professors at prestigious (声誉高的) universities, is that they're free. This is certainly good news for cash-strapped students.

    There is a lot of excitement and fear about MOOCs. While some say free online courses are a great way to increase the enrollment (注册) of students who are lack of resources, some critics (批评者) have said that MOOCs encourage an unrealistic one-size-fits-all model of higher education and that there is no replacement for true dialogues between professors and their students. After all, a brain is not a computer. We are not blank hard drives waiting to be filled with data. People learn from people they love and remember the things that arouse emotion. Some critics worry that online students will miss out on the social aspects of college.

    Two of the hardest things to accomplish in this world are to acquire wealth by honest effort and, having gained it, to learn how to use it properly. Recently I walked into the locker room of a rather well­known golf club after finishing a round. It was in the late afternoon and most of the members had left for their homes. But a half­dozen or so men past middle age were still seated at tables talking aimlessly and drinking more than was good for them. These same men can be found there day after day, and, strangely enough, each one of these men had been a man of affairs and wealth, successful in business and respected in the community. If material prosperity were the chief necessity for happiness, then each one should have been happy. Yet, it seemed to me, something very important was missing, else­there would not have been the constant effort to escape the realities of life through scotch and soda. They knew, each one of them, that their productivity had ceased (停止). When a fruit tree ceases to bear its fruit, it is dying. And it is even so with man.

    What is the answer to a long and happy existence in this world of ours? I think I found it long ago in a passage from the book of Genesis which caught my eye while I was looking through my Bible. The words were few, but they became memorably impressed on my mind. "In the sweat of the face shall you eat the bread."

    To me, that has been a challenge from my earliest recollections (memories). In fact, the battle of life, of existence, is a challenge to everyone. The immortal words of St. Paul, too, have been and always will be a great inspiration to me. At the end of the road I want to be able to feel that I have fought a good fight, I have finished the course, I have kept the faith.

    In 1972, a social worker named Sanjit Bunker Roy founded Barefoot College in Tilonia, Rajasthan. Today the college trains women from villages for six months to build and maintain solar panels and other instruments. Barefoot College also offers education to the younger generation both during the day and at its solar bridge schools that meet by lamplight at night.

    The philosophy of Barefoot College is largely inspired by the principles of Gandhi, starting with equality beyond caste (种姓), gender or religion. As a matter of fact, women are prioritized (优先考虑) as an underserved population that is essential to bringing villages together. Another central principle of the college is self-reliance, teaching students to support and think for themselves.

    After the college's female students have completed their half-year of training, they return to their villages where they wait for solar panel parts to arrive from the college. Once they have all the pieces they need, they construct the panels and begin collecting solar energy. For each village, the college also provides solar lamps. Villagers can, in addition, order parts for other solar-powered devices, such as water heaters and cooking stoves. Once assembled, they and the lamps are powered by the solar panels.

    The effect on the villages is huge. Before the solar panels and lamps arrived  villagers had only candles to light their homes. This prevented adults from doing serious work at night, and it made studying difficult for children as well. As for physicians, they had difficulty treating patients and performing operations at night because they had to rely on flashlights.

    Now there is power for not only the electrical appliances that the college provides but also devices like televisions, radios and computers. For the first time, the villagers can even connect to the world through the Internet.

    Norman Merriam Webster BES—1850 Dictionary

    This handy translator provides you with 5,000,000 total translation to and from Spanish and English! This dictionary is specially designed for all levels of language ability from beginners to advanced learners.

    Brand V7 Dictionary / Translator

    This special model features the largest and most complete Russian-English dictionary. Advanced English speech, accent correction function and specialized terms database will help you better communicate. Business organizers will allow you to stay in touch with the world through all kinds of advanced features.

    Seiko WP1500 Rogets III Thesaurus Dictionary

    It is the nearest word finder. It is also great for cross word puzzles. It will show you the time, day and date of local time zone and the same for over 100 cities throughout the world by simply entering the first letter of the name of the city.

    The Lingo Traveler 18

    It is an international translator containing over 96,000 words and 8,000 useful phrases. Equipped with a powerful databank, the Lingo Traveler 18 allows you to store all of your appointments, telephone numbers, and addresses.

    If you love eating and drinking for free and are looking to make some pocket money, there's a job in China with your name on it. A new type of online service allows people to hire others either to eat or drink their favorite treats or satisfy their appetite without the calories that usually come with it.

    Chinese media recently reported on an increasingly popular service on online platform Taobao that's as startling as it is appealing. People can now go online and hire others to consume certain foods and drinks, and ask them to provide video evidence of them eating or drinking the said treats.

    Fees usually range from two to nine yuan ($0.30 - $1.35) plus the cost of the food. It's not exactly a get-rich-quick job, but there are quite a lot of people willing to do it for the free treats alone.

    "Bubble tea drinking" is a particularly popular service, as the chewy tapioca(木薯粉) balls and popping drink is all the rage in Asia these days, but there are also ads from people willing to eat fried chicken or hot pot for anyone willing to pay for them.

    Advertised as being "fat-free" and "free of queues", those who pay for the service will receive the full experience, which includes a 360-degree video of the drink, photos, and a detailed description. Prices of the service are based on the drink's sweetness level, its price, and popularity. Some clients even require a short written review to be sure that the person they hired actually does what they are supposed to.

    Sellers explained that most customers buy their "Bubble tea drinking" service maybe because they're trying to shake off desires while they're on a diet. Drinking bubble tea by proxy may help customers avoid high blood pressure, high blood sugar, and other health problems that the sugar-laden drink may cause.

    So why would anyone pay a total stranger to enjoy a treat rather than consume it themselves? Well, apparently, the online service is so cheap that some people simply do it out of boredom, while others get satisfaction from watching others indulge in their favorite treats.

    This indulging-by-proxy service(代享受服务)has received a lot of attention on social media in China, with some people describing it as the job of their dreams.