Read the following article and answer the question. Article: For thousands of years, people have seen things they didn't understand in the sky. The United States Air Force first used the words "Unidentified Flying Object" to describe them. Today everyone uses the term UFO. When people see a UFO, it is usually no more than a weather balloon or an airplane. But the Center for UFO Studies goes on to receive hundreds of reports each year. In 1947 a businessman and pilot, Kenneth Arnold, was flying near Mount Rainier, Washington when he saw nine shiny, round objects flying through the air. He told a newspaper reporter they looked like "pie plates skipping over water." The reporter used the words "flying saucer " in his story and today that is the popular name for UFOs. The Center for UFO Studies lists three kinds of contacts with flying saucers. "Encounters of the first kind" are reports of unknown objects or lights in the sky. People have "Encounters of the second kind" when a UFO leaves burn marks or other signs on the ground. People report "Close encounters of the third kind" when they see aliens in or near a UFO. Question: Why did the newspaper reporter use the words "flying saucer" to describe the UFO that Kenneth Arnold said he saw? Answer:
OPTIONS:
- Because the UFO that Kenneth Arnold saw was flat.
- Because Kenneth Arnold told the newspaper that what he had seen in the sky was round.
- Because Kenneth Arnold described what he has seen looked like a plate flying in the sky.
- Because what Kenneth Arnold saw was pie plates flying in the air.
Because Kenneth Arnold described what he has seen looked like a plate flying in the sky.

Read the following article and answer the question. Article: While traveling satisfies different needs of various types of people, most serious adventurers hope to make some connections while they're experiencing another culture. Discovering another way of life is fascinating, and leads to a deeper understanding of one's own culture as well. However, it can be difficult to get to know people and customs if one's trip is spent at a hotel. A better choice for gaining insight into the culture of a country is couchsurfing. Couchsurfing is free, and guarantees a close encounter of some sort, as it allows you to stay on a local's couch or in a guest room. Travelers can look up couchsurfing opportunities on Couchsurfing.com, where hosts and surfers can connect, create and view profiles, and exchange information. "Meeting their friends, seeing how they function and seeing how people were actually living are so personal. I really like the opportunity to gain a pure knowledge of someone's life," says Meghan Sinnott, who recently couchsurfed in Denmark, Holland, and Sweden. The formal Couchsurfing Project has been around for a while. It was started in 1999 by Casey Fenton, who was on a cheap trip to Iceland from Boston. Finding himself without a place to stay, he e-mailed more than a thousand students at the University of Iceland and got more than 50 responses offering him a free couch. When he returned to his hometown Boston, he decided to turn the experience into a website-based network, which was created in 2004. While some travelers might be afraid of the idea of sleeping on a previously unseen couch or getting a cup of coffee with a complete stranger halfway across the country, others jump at the chance to walk into the unknown. And that tells us exactly what couchsurfing is all about--learning about the world and a stranger at a time. Question: People choose couchsurfing while traveling mainly to _ . Answer:
OPTIONS:
- see beautiful scenes
- experience different cultures
- save money
- write traveling articles

Answer: experience different cultures

Read the following article and answer the question. Article: A machine that takes sweat-laden clothes and turns the moisture into drinking water is in use in Sweden. The device spins and heats the material to remove the sweat, and then passes the vapor through a special membrane designed to only let water molecules get through. Since its Monday launch, its creators say more than 1,000 people have "drunk others' sweat(h)" in Gothenburg. They add the liquid is cleaner than local tap water. The device was built for the United Nation's child-focused charity UNICEF to promote a campaign highlighting the fact that 780 million people in the world lack access to clean water. The machine was designed and built by engineer Andreas Hammar, known locally for his appearances on TV tech show Mekatronik. He said the critical part of the sweat machine was a new water purification component developed by a company named HVR in collaboration with Sweden's Royal Institute of Technology. "It uses a technique called membrane distillation ," he told the BBC."We use a substance that's a bit like Gortex that only lets steam through but keeps bacteria, salts, clothing fibers and other substances out."They have something similar on the International Space Station to treat astronaut's urine - but our machine was cheaper to build. Volunteers have been sampling the treated sweat since the start of the week in Gothenburg ."The amount of water it produces depends on how sweaty the person is - but one person's T-shirt typically produces 10ml , roughly a mouthful." The equipment has been put on show at the Gothia Cup - the world's largest international youth football tournament. MattiasRonge, chief executive of Stockholm-based advertising agency Deportivo - which organized the stunt - said the machine had helped raise awareness for UNICEF, but in reality had its limitations. "People haven't produced as much sweat as we hoped - right now the weather in Gothenburg is lousy," he said."So we've installed exercise bikes alongside the machine and volunteers are cycling like crazy."Even so, the demand for... Question: What does Mattias Ronge think of the machine? _ Answer:
OPTIONS:
- The machine can solve the severe water shortage in the world.
- People do not like the water the machine processes
- The machine should be used in rather hot areas in summer.
- The machine is not worth popularizing.
The machine is not worth popularizing.