input: OPTIONS:
- to prove Americans have less food to choose from
- to show us the shopping habits of most Americans
- to indicate Americans tend to buy food from abroad
- to remind people to reconsider their food purchase Now, answer this question: Read the following article and answer the question. Article: Making greener choices and encouraging healthy lifestyles can promote your health and benefit the environment. Here are some guidelines to follow: Choose foods thoughtfully Americans have never had such a variety or abundance of food to choose from. Besides so many choices, we now hear about our "food print", the amount of land needed to supply one person's nutritional needs for a year. Do we buy cherry tomatoes from Mexico or tomatoes grown locally in a hothouse? Do we get the Granny Smiths from the farmers' market or the supermarket? Is organic produce healthier for us and the planet? These are very complex issues that require analysis of many criteria, including the energy used in producing and transporting the food, as well as the type of soil and methods of raising the food. Despite the complexities, there are some general guidelines you can follow. For instance, eat less meat or eat low on the food chain. Your doctor may have recommended you to restrict your consumption of red meat because of its too much fat content. Beyond that, there are environmental reasons, too. Raising food animals contributes substantially to climate change because a meat-based diet requires more land, energy and water than a plant-based one. _ Drinking plenty of fluids is significant during hot weather or when exercising. But is bottled water the way to go? You may not think so when seeing the true costs. Based on a survey, manufacturing the 30-plus billion plastic water bottles can produce more than 2.5 million tons of carbon dioxide and use three times the amount of water in the bottle. Adding in transportation, the energy used comes to over 50 million barrels of oil equivalent . Consequently, skip the bottled water and drink tap water, both at home and at restaurants. Additionally, bottled water is not necessarily cleaner than tap. Question: In Paragraph 2 the author puts forward three questions mainly _ . Answer:
A:
output: to remind people to reconsider their food purchase

input: OPTIONS:
- Greater London
- The Improtance of London
- The Boroughs of London
- London Now, answer this question: Read the following article and answer the question. Article: London, the capital of England, is political, economic and commercial centre. It stands on the Thames, extending for nearly thirty miles from north to south and for nearly thirty miles from east to west. London is divided into many administrative units. Greater London, the largest unit, cover 1,605 square miles. The heart of this unit is the City of London. It is surrounded by a ring of 12 boroughs called Inner London or Central London, covering 303 square miles, and itself, is again surrounded by a greater ring of 20 boroughs called Outer London with an area of 1,279 square miles. Thus, Greater London is made up of the City and 32 boroughs. Question: Which is the best title of the article? Answer:
A:
output: London

input: OPTIONS:
- MOOCs have a platform for learners to share their learning experience
- MOOCs provide teachers' instructions if you have some difficulty
- MOOCs can be adjusted according to people's learning pace
- MOOCs are free of charge for anyone Now, answer this question: Read the following article and answer the question. Article: MOOCs (Massive Open Online Courses) are free, but without tutoring, and are open to anyone, anywhere in the world. The courses are flexible -- normally three to five hours of study a week -- done at any time, short (5 to 10 weeks) and video-rich. They are also heavily dependent on crowd sourcing: you can discuss a course with fellow students through online forums, discussion boards and peer review. Students don't have to finish the courses, pass assessments or do assignments, but, if they do, they get a certification of participation. The Open University launched FutureLearn, the UK's answer to US platforms such as Coursera, EdX and Udacity, which have been offering MOOCs from top US universities for the past two years. The response has been incredible, with more than three million people registering worldwide. Meanwhile, in 2012, Edinburgh University became the first non-US institution to join Coursera's partnership, comprising 13 universities. "We already run 50 online master's degrees, so this was a logical expansion," says Professor Jeff Haywood, Edinburgh's vice-principal. "It's an investment in teaching methods research. How am I going to teach introductory philosophy to 100,000 people? That's what I call educational R&D." He adds "If you look ahead 10 years, you'd expect all students graduating to have taken some online courses, so you've got to research that. Our MOOCs are no more in competition with our degrees than a lifelong learning course because they don't carry credits." Cooperation is key, Haywood stresses. It is far better to offer 20-30 courses in your own areas of expertise and let other institutions do likewise. Professor Mike Sharples, FutureLearn's academic lead, goes further: "We've tied the elements available before into a package of courses offered by leading universities worldwide on a new software platform, with a new way of promoting it and also a new social-learning teaching method. You won't just receive an exam, but be able to discuss and mark each other's assignments." Bath... Question: MOOCs have these features EXCEPT that _ . Answer:
A:
output:
MOOCs provide teachers' instructions if you have some difficulty