Article: Dolphins are interesting animals and researchers find them interesting to watch. They don't have hands, but can use tools to solve problems, just like us. Scientists have observed a dolphin trying to get a shy eel to come out of its hole by poking it with a dead fish. Many species of dolphin live in large societies. They have many different relationships and need a good communication system; they use a variety of sounds to communicate with each other. There is currently no evidence that dolphins have a language of their own. But scientists still have a lot to find out about these animals and so there are certain to be a few surprises in the future. At Kewalo Basin Marine Laboratory in Hawaii, the dolphin team have developed a sign langue to communicate with the dolphins, and the results are amazing. Not only do the dolphins understand the meaning of individual words, they also understand the significance of word order in a sentence. For example, when they were asked to 'touch the ball with your tail and then jump over it' they generally responded correctly and straight away, which showed that they understood the langue. Most mammals seem to enjoy play--but dolphins seems to like making their games as challenging as possible. On a beautiful day in 1997, researchers working at a beach, off the southern coast of Brazil, observed a little dog going into the sea and swimming towards the dolphins. To their surprise, the dolphins approached the dog and then started throwing it into the air. The dog seemed to enjoy the 'game' and continued playing with the dolphins for more than an hour. From then on, different dogs were seem trying to interact with the dolphins. Dolphins live in a very different world to ourselves, but they are very good at our 'intelligence tests'. For example, they will jump out of the water when they hear a whistle noise. They do this because they will get a fish as a reward. There is still much to learn about these flexible problem-solvers, but from the evidence so far, it would seem as though... Question: When they play, dolphins seems to like making their games as _ as possible. Yes or no, is the answer "difficult"?
Yes

Article: Some years ago, a Miami woman walking through an office building noticed two men standing together.Several minutes after her leaving, the men murdered a person working in the building.The police determined that the woman was the only witness and could possibly describe them.However, her memory of the men proved disappointingly unclear.Several days later, psychologist Ronald Fisher was brought in to obtain a more complete account from the woman.His interview produced a breakthrough--the woman reported a clear picture of one of the suspects.The important information enabled the police to arrest the suspect and close the case. The police asked Fisher for help because of his rich knowledge in cognitive interview, a kind of memory - rebuilding process.Memory researchers have found that people trying to remember a past event often only recall part of the relevant information.Human memory is selective and it is often _ by stress.But a person's accurate recall of an event or understanding of a question can be improved using specific interviewing techniques.The "cognitive interview" was developed in the late 1990s.It encourages the witness to take an active role in recalling information rather than giving answers only to someone else's questions.The witness first describes what happened in his or her own words, with no interviewer interruptions.The interviewer then goes further with specific techniques, such as having the witness tell the details of what happened from different perspectives . The cognitive interview focuses on guiding witnesses through four general recalling techniques: thinking about physical surroundings and personal feelings that existed at the time of past events; reporting everything that connects to mind about those events, no matter how broken it is retelling events in a variety of time orders, such as from beginning to end, end to beginning, forward or backward; and adopting different perspectives while recalling events. Experiments with police detectives trained in this demanding interview... Question: What is required to recall in a cognitive interview for a witness? Yes or no, is the answer "The surroundings and feelings at the time of the event."?
No

Q: Article: The prestigious Peking University and Tsinghua University held graduation ceremonies on the same day this year. The presidents of the two universities delivered excellent speeches at the ceremonies as they used words, phrases or ways of expression that are very popular on the Internet currently. At the same time, graduation speeches by other university presidents were also under the spotlight for the same reason. Their speeches were warmly welcomed by students as they contained many fashionable words today, such as "floating clouds" ( meaning "too small and of little importance to mention") and "gelivable" (meaning " very helpful") . In the speeches , these university presidents recalled campus life together with students and finally moved all the audiences. They were very different from the usual run of lectures. Many university presidents have changed their regular manner of addressing graduation ceremonies from an advising and preaching mode to a more fashionable and funny approach. They try to use those words popular among young people in their speeches. In the past, university presidents' speeches were criticized for being too standard and lacking sentiment. Now , they quote fashionable words in their addresses, reflecting they are starting to adopt more everyday attitudes to students. The use of these new expressions has _ a heated discussion. It focuses on the question of whether university presidents should speak in an informal way at graduation ceremonies. Supporters agree with the new approach. They consider it good to build close ties with students by using the youth's own words. Opponents argue the new ways have no practical value or significance for education but are merely to please those leaving university. Question: What would be the best title for this passage? Yes or no, is the answer "Should University Heads Use Terms of Youth"?
A: Yes

Article: Wild elephants live in herds of 10 to about 50. The leader is usually a female. A herd can go through a forest quietly. It travels in a single line. It goes about 6 miles an hour. When frightened, it may run at about 25 miles an hour. When they reach water, elephants swim across. They are great swimmers. Elephants eat grass, leaves, small branches, and bark. They particularly like the tender leaves on the top of trees. How do they get these leaves? They use their heads to knock trees down. They can easily knock down a 30-foot tree. Elephants also eat berries, mangoes, coconuts, corn, and sugar cane. They love salt. A wild male adult eats 500 to 600 pounds of food a day. Many people want to find the graveyards of elephants. There is a strong belief that such graveyards exist. Here is why. Bones and tusks of dead elephants have almost never been found. Searches have been made in forests. Grassy plains have been searched too. But neither bones nor tusks are found. Elephants don't live forever. Where are their bones? They don't just bury themselves. Here is one belief. When an elephant gets sick or old, it instinctively knows death is near. It leaves the herd. It goes off to a secret graveyard. The place is known only to elephants, and perhaps other animals, but not to humans. Obviously, such a graveyard would be filled with tusks. These were once very valuable. The objective of explorers was to find this "gold" mine. This graveyard belief may be a truth or a myth. But it is romantic. It would be nice if it were true. Question: From the passage we can learn that _ . Yes or no, is the answer "whether there are graveyards of elephants is still not known"?
No