Ques:Read the following article and select the best answer. Article: While very young unmanned aircraft industry looks at ways to improve small unmanned aircraft systems (UAS) for specific tasks such facility security, infrastructure inspection, or precision agriculture, a New Mexico-based aerospace founder is thinking bigger and longer-term ones. Titan Aerospace, a one-year-old aircraft designer, last week unveiled its Solara 50 and Solara 60 unmanned aircraft. These are two large solar-powered>> high-altitude vehicles the company plans to send up into space for weeks,months>> and eventually years at a time without ever having to land. Titan doesn't refer to these concept aircraft as "drones " or "unmanned aircraft system," but instead calls them "atmospheric satellites" for their ability to remain in the sky for extended periods of time just as orbital satellites do. The company hopes to provide a platform of less than $2 million that governments, private industry, and research institutions can put high into the atmosphere for extended periods of time for a little part of the cost of a space satellite. The idea is that an atmospheric satellite can conduct most of the same operations as an orbital one: atmospheric observation and weather monitoring, communications relay, oceanographic research, and earth imaging. Other operations are impractical for space satellites, such as border security, maritime traffic monitoring and anti-piracy operations, disaster response, or agricultural observation. And with continuous flight time of up to five years, Solara's aircraft would have endurance on par with (......) many small satellites, making them a more attractive choice for a range of these applications. "If you have to go up to the orbital satellite and rent that service>> that's a lot of money," says Dustin Sanders, Titan's chief electrical engineer. "And launching a satellite, that can cost billions of dollars. We're trying to do a single-million-dollar-per-aircraft platform. And the operation cost is almost nothing--you're paying a little money and make sure the aircraft... Question: We know from the passage that the atmospheric satellite can continue to stay in the sky for _ - five years - six years - seven years - eight years

Ans:five years
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Ques:Read the following article and select the best answer. Article: Most musicians agree that the best violins were first made in prefix = st1 /Italy. They were made inCremona,Italy, about 200 years ago. These violins sound better than any others. They even sound better than violins made today. Violin makers and scientists try to make instruments like the old Italian violins. But they aren't the same. Musicians still prefer the old ones. No one really knows why these old Italian violins are so special, but many people think they have an answer. Some people think it is the age of the violins. They say that today's violins will also sound wonderful someday. But there is a problem here. Not all old violins sound wonderful. Only those from Cremonaare special. So age cannot be the answer. There must be something different aboutCremonaor those Italian violin makers. Other people think the secret to those violins is the wood. The wood of the violin is very important. It must be from certain kinds of trees. It must not be too young or too old. Perhaps the violin makers of Cremons knew something special about wood for violins. But the kind of wood may not be so important. It may be more important to cut the wood in a special way. Wood for a violin must be cut very carefully. It has to be the right size and shape. The smallest difference will change the sound of the violin. Musicians sometimes think that this was the secret of the Italians. Maybe they understood more than we do about how to cut the wood. Size and shape may not be the answer either. Scientists measured these old violins very carefully. They can make new ones that are exactly the same size and shape. But the new violins still do not sound as good as the old one. Some scientists think the secret may be the varnish, which covers the wood of the violin and makes it look shiny. It also helps the sound of the instrument. No one knows what the Italian violin makers used in their varnish. So no one can make the same varnish today. There may never be other violins like the violins of Cremona. Their secret may be lost forever.... Question: Violins made today _ . - look the same as the old ones - sound the same as the old ones - are better than the old ones - have the same varnish as the old ones

Ans:look the same as the old ones
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Ques:Read the following article and select the best answer. Article: The nervous-looking young man had waited for a few moments outside the jeweler's shop before he got enough courage to enter.He was warmly greeted by a young assistant. James felt a rush blood to his face as he explained he would bring in his future wife to choose a birthday present.The assistant listened carefully and told him he'd better buy a necklace. He wasn't used to buying jewelry and was a little worried about overspending. After some discussion as to reasonable price and type , the assistant showed him dozens of necklaces and helped him to choose. At last James chose one and left the shop promising to return at five o'clock. When, half an hour later, James did return to the shop with his future wife, Laura, the assistant acted as if she had never seen him before. When she was asked to show them some necklaces, she first brought out some inexpensive ones for them to choose and then gave them the one she had prepared. A choice was soon made and they went away, satisfied. James would certainly come back to buy what he wanted when he got married. Question: A good title for this passage is _ . - A Clever Assistant - Buying a Birthday Present - How to Choose a Necklace - A Brave Young Man

Ans:
A Clever Assistant
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