Article: NASA postpones Discovery landing After orbiting the earth for nearly two weeks, astronauts aboard space shuttle Discovery were told to circle the planet for another day as bad weather inprefix = st1 /Floridaforced NASA to delay Monday's scheduled landing. The astronauts had powered up their space-craft and were awaiting word from Mission Control to fire their breaking rockets and head for home when controllers announced early Monday that low clouds over Cape Canaveral would postpone the landing. When cloud cover still threatened after the second of two landing opportunities, NASA officials rescheduled the landing for Tuesday, when they would consider two alternative landing sites in addition to Florida'sKennedySpaceCenter. Before the weather _ , Discovery had been set to land before dawn. Its return to the earth would have concluded the first shuttle flight sinceColumbiadisintegrated while re-entering the earth's atmosphere 21/2 years ago. Discovery's 13-day flight to the international space station may be the last one for a long while. NASA grounded the shuttle fleet after a slab of insulating foam broke off Discovery's external fuel tank during liftoff---the very thing that doomed(...) Columbia and was supposed to have been corrected. Discovery was the first shuttle to visit the station since 2002. As a result ofColumbia, Discovery's crew inspected their ship for damage on five different days and also tested repair techniques developed since the tragedy. Question: How many shuttle flights returned to the earth before Columbia? Yes or no, is the answer "We have no idea"?
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Article: An old and very rich friend of mine told me he had an unpleasant experience. He went to a famous jewelry shop and asked to be shown some gold necklaces. After examining several minutes, he decided to buy a gold necklace with a precious diamond, and asked if he could pay by cheque . The assistant said that was quite in order, but the moment my friend signed his name, he was invited into the manager's office. The manager was very polite, but he explained that someone with exactly the same name had given them a worthless cheque not long ago. My friend got very angry when he heard this and said that he would buy a diamond necklace somewhere else. When he got up to go, the manager told him that the police would arrive at any moment and he had better stay unless he wanted to get into serious trouble. Sure enough, the police arrived soon afterwards. They were polite, too, but explained that a person who had used the same name as his was responsible for a number of recent robberies. Then the police asked my friend to copy out a note which had been used by the thief in a number of stores. The note read, "I have a gun in my pocket. Ask no question and give me all the money in the drawer." Luckily, my friend's handwriting was quite unlike the thief's. He was not only allowed to go without further delay,but also to take the diamond necklace with him. Question: After the man heard what the manager said, he _ . Yes or no, is the answer "thought that he had nothing to do with the stealing"?
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Ques: Article: A rising population is one of the main reasons that there is global warming. Between 1650 and 1850 the population increased by 0.75 billion people going from 0.25 billion to one billion. From 1930 to the end of the century the population rose from two billion to over six billion. In just a third of the time the population rose by more than five times what it did before. It is expected that this trend in the changing population will continue and could even heighten. The growing population requires increasing amounts of energy. These energy demands and other supplies require production, which almost always involves the emission of greenhouse gases. The more the population increases the more greenhouse gases that are produced and the greater the increase in temperature. The burning of fossil fuels is one of the best-known causes for global warming. The major reason for fossil fuels contributing so much to global warming is the release of carbon that occurs during the burning of fossil fuels. When people burn fossil fuels, they release large amounts of carbon by way of the release of carbon dioxide. The carbon dioxide in the air then leads to global warming. Another source of carbon dioxide comes from _ . In forests there is a large amount of carbon that is stored in the trees and other plants. This carbon is out of the atmosphere because the trees consume the carbon from carbon dioxide. When people cut down trees, they are frequently burned. This burning releases the carbon dioxide into the atmosphere that was stored in organic matter. Even when new trees are planted, it can take up to one hundred years to make up for the carbon that was released. It is commonly thought that because trees absorb more carbon dioxide, the atmosphere experiences positive effects. Sophie Armstrong, the writer of Earth Care put it, "There's no doubt that the earth is becoming warmer because of human activity rather than a random but natural phenomenon. Question: Which of the following titles goes with the text? Yes or no, is the answer "Global warming: The causes"?
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Ques:Article: A blue hole is a flooded sea cave with a hole that opens up at the land's surface. These cave systems form in carbonate rock, often on islands. Some blue holes have very special rock formations and water chemistry. Far below sea level, they contain some of the harshest environments on Earth, with no oxygen and no light. Yet these areas are filled with life forms that have adapted to the extreme conditions. Information gathered from these blue holes is helping scientists to increase their understanding of biology, archaeology and geology. But exploring these blue hole environments brings danger as well as discovery. Blue holes get their name from the color1 some have when seen from the air. The color1 is usually a reflection of the sky on the water. But not all of these cave systems have blue surfaces. Some contain dark or muddy water. Blue holes are the result of erosion in which water breaks down rock. Rain falling thousands of years ago contained chemicals which slowly wore away at the limestone landmass. These holes were later filled with sea water as the sea level changed. The rising and falling of sea levels and the mixture of salt and fresh water further wore away at these cave formations. Blue holes are vertical caves. But they can also have horizontal cave formations that may be hundreds of meters long. These flooded cave systems can be found in the ocean, or they can be found inland. Ocean caves are affected by tides, so they always have water movement. But blue holes on land are very still. They have several layers of water, chemicals, and bacteria. The top layer of fresh water comes from rainfall. This layer acts like a cap on top of the layered mixture, and keeps out oxygen from the atmosphere. The fresh water floats on a denser layer of saltwater. Underneath this is a layer of poisonous hydrogen sulfide, produced by bacteria living in the water. Underneath this layer is anoxic seawater -- water that does not contain any oxygen. Underwater caves are probably one of the least explored ecosystems... Question: It can be inferred front the passage that _ . Yes or no, is the answer "the chemicals in the rain lead to the formation of blue caves"?

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