Read the following article and select the best answer. Article: What would you do if you were lost in the dark forest at night? The first sensible lesson is that you shouldn't bother trying to find your way in the dark at all, but just stay put until dawn. Because then you won't trip over things? No, mainly because you'll have an idea of direction. The sun rises in the east. But you will be amazed at how many people forget they know that. Apparently, the area underneath a holly bush provides a good makeshift shelter -- they are thick, and evergreen. The next thing to do -- or rather not to do -- is panic, for the obvious reason that unless there is someone there to hear you scream, it will get you nowhere. Just try to think of nice, happy things. There is always a point in films when a person who is lost in the desert or the snow, dehydrated and exhausted, comes across a set of their own footprints and realizes they have just walked in a huge, round circle. It is wrong to owe it to the unequal strengths or different lengths of your legs. Experiments prove that, without the sun or the moon (or landmarks) as a fixed guide, lots of small errors add up over time so the brain can't correctly identify the "straight ahead" direction. To just get out of somewhere, pick a spot on the horizon and just head for it. There are several ways to find directions in the dark, and by far the best is to establish north using the stars. Most people can identify the Plough, which is part of Ursa Major. It looks a lot like a saucepan. The Plough rotates through the sky, but let's imagine the saucepan lying horizontally , with its handle on the left. You need to trace a line from the star at the right-hand base of the pan, through the star at the right-hand rim , and follow it upwards; the north star is roughly five times the distance between those two "pointer" stars. Then drop a vertical line from the North Star to the horizon and that's north. "Tonight is very cloudy and I can't see the Plough." Maybe luckily, it is quite windy. Keep in mind that almost all of our weather comes from a... Question: Why will people often walk in a circle if they are lost in the desert or the snow? - Because without anything to refer to for directions, the brain will be confused by errors. - Because one of the legs is longer and stronger than the other. - Because the desert or the snow usually covers a large area for people to get across. - Because people usually feel dehydrated and exhausted in the desert or the snow.
Because without anything to refer to for directions, the brain will be confused by errors.

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Read the following article and select the best answer. Article: Well-known lines by Tang Dynasty poet Du Mu describe a sad scene in early April: "The ceaseless drizzle drips all the dismal day. So broken-hearted fares the traveler on the way.(,)". In China, Qingming Day, or Tomb-Sweeping Day, falls every April. People visit their ancestors' graves to clean away the dirt. Schools sometimes organize a trip to a local martyr's park where students show their respect for those who lost their lives in revolutionary wars. In most Western countries there is no equivalent of tomb-sweeping day, but people still value the opportunity to remember loved ones. On the anniversary of a death, s visit the cemetery. Often they will leave flowers. In the US, the last Monday of May is Memorial Day. It is a holiday to show respect for those who died defending the country. The most common way to recognize the day is to wear a small piece of yellow ribbon on the chest. People also fly their own American flags. Sometimes they put a small flag on their car, tied to the antenna .Flags are also flown in yards. In the morning, all flags should be flown at half-mast in honor of fallen soldiers. In Britain, people wear red paper replica poppies in November in remembrance of those who died or were injured in all fighting, but most particularly in World War I. Why the poppy? It goes back to a poem written by John McCrae in 1915. He saw the fragile flowers growing on the graves of soldiers. McCrae wrote: "In Flanders fields the poppies blow between the crosses, row on row." The poppies make people think of fields of blood. The flowers also live only briefly, like the soldiers who fell in the war. Question: What has nothing to do with Memorial Day in the US? - People don't go to work. - In the morning, all flags should be flown at half-mast in honor of fallen soldiers. - People fly their own American flags; sometimes they put a small flag on the car, tied to the antenna. - People wear a small piece of yellow ribbon on the chest.
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People don't go to work.

Read the following article and select the best answer. Article: Taking a picture of your tongue with a mobile phone could soon instantly tell you how healthy you are. Researchers believe the images can reveal important information about a patient's health and even give them early warning of serious illness. A team at the University of Missouri is developing a system that can analyze pictures using a 5,000-year-old Chinese principle, which is based on the flow and balance of positive and negative energies in the body, and uses the tongue as a key to learning about a person's physical health, or "zheng" according to Chinese medicine. "Within a year, our goal is to create an application for smart phones that will allow anyone to take a photo of their tongue and learn the status of their zheng," said Dong Xu, chair of MU's Computer Science Department in the College of Engineering and the co-author of the latest study. The software analyzes images based on the tongue's color and coating to distinguish between tongues showing signs of "hot" or "cold" zheng. Shades of red and yellow are associated with hot zheng, whereas a white coating on the tongue is a sign of cold zheng. "Hot and cold zheng doesn't refer directly to body temperature," said Xu, "Rather, it refers to a series of symptoms associated with the state of the body as a whole." For the study, 263 gastritis patients and 48 healthy volunteers had their tongues analyzed. The gastritis patients were classified by whether they showed infection by a certain bacteria as well as the intensity of their gastritis symptoms. In addition, most of the gastritis patients had been previously classified with either hot or cold zheng. This allowed the researchers to test the accuracy of the software's analysis. "Our software is able to classify people based on their zheng status. And as we continue to work on the software we hope to improve its ability," said another co-author Ye Duan, "Eventually everyone will be able to use this tool at home using webcams or smart phone applications, which will allow them to monitor their zheng and... Question: The study led by Dong Xu proves _ . - the effect of the software - the software's great prospect - the advancement of smart phones - the greatness of Chinese medicine
the effect of the software