Read the following article and select the best answer. Article: A new smart phone system under development can locate you even when you're inside a building, which GPS can't do. While the concept sounds powerful, it's not yet clear how practical it might be. The set-up, called SurroundSense, sends information from cameras and microphones--gear in the latest smart phones--to a server that produces a fingerprint of the location. "You can't tell much from any of the measurements individually, but when combined, the optical , acoustic and motion information creates a unique fingerprint of the space," said Ionut Constandache, a student in computer science. The system distinguishes between two indoor spaces in this manner: It knows that a bar is likely to be dark and noisy and people move little, sit a lot, whereas a department store will be brightly lit, contain vibrant colors, and will see a lot of people moving up and down passages. The more the system is used, the more it learns about specific places. More work is needed before the set-up would be ready for prime time, however. For now, it can't work if a person's cellphone is in a handbag or otherwise unable to employ the camera. Finally it would be best served if paired with phones that were worn on the wrist or hung around the neck. Batteries, too, are a problem. Students on the research team went out across Durham, North Carolina, with their cellphones collecting data in different types of businesses. The students mirrored the actions of the selected customers so that they would not prejudice the measurements. "We went to 51 different stores and found that SurroundSense achieved an average accuracy of about 87 percent," Constandache said. "As the system collects and analyzes more and more information about a particular site, the fingerprint becomes more precise," said Romit Roy Choudhury, professor of computer engineering. "Not only is the _ different at different locations, but also can be different at different time at the same location." Question: Why did students mirror the actions of the selected customers? - To get a reasonable result. - To collect data in different ways. - To receive information about a particular site. - To learn more about specific places.
To get a reasonable result.

(Question)
Read the following article and select the best answer. Article: Up to two-fifths of a food crop is often wasted because it is "ugly", a report on food waste has shown. Produce grown in the UK that does not meet retailer standards on appearance is often given to animals or thrown out even though it is healthy to eat. The report from the UK's global food security program also showed that the average household throws away more than 5kg of food a week, and nearly two-thirds of that waste is avoidable. The waste costs PS 480 a year per household on average, and PS 680 per family. Households throw away a fifth of the food they buy, wasting it for reasons ranging from cooking too much to not using it before it goes bad, the study showed. Consumption is the top area where food is wasted in the UK, the study said. Farmers respond to consumer demands for high-quality food with standards that can lead to the crop being wasted. Some supermarkets have started marketing "odd shapes and sizes" of fruit and vegetables, though. Also, more UK consumers are prepared to accept "ugly" fruit and vegetables, amid concerns over sustainability and food prices, the research said. In developing countries, much of the loss of food occurs during post-harvesting storage, processing and packaging. Tackling waste globally is necessary to feed a growing world population sustainably. One in eight people worldwide doesn't have enough food, the report said. Around a third of food produced globally is lost or wasted. Professor Tim Benton, an expert on food security at the University of Leeds, said: "Over 5 million people in the UK live in poverty, where basic food provision is a daily challenge." Nearly 400,000 people used food banks last year, according to the Trussell Trust. "At the same time, 15 million tons of food is wasted annually, with nearly half thrown away within UK households. Reducing the scale of losses and waste throughout the food system is a crucial step." The report highlights priorities for research to help reduce food waste, including improving harvesting and packaging technologies... Question: Food waste in developing nations is mainly due to _ . - fast growing populations - huge demand for high-quality foods - poor technology in food industries - people's lack of concern about food shortages
(Answer)
poor technology in food industries

Ques: Read the following article and select the best answer. Article: A new study, conducted by British company Mindlab International, has found that listening to music at work increases accuracy and speed,The Telegraphreported. Perhaps, some parents disagree with this idea, saying, "Switch off the music and concentrate!" Well, if that's the case with your parents, you might now be able to convince them that you have science on your side. The company gave 26 participants a series of different tasks for five days in a row, including spell checking, mathematical word problems, data entry, and abstract reasoning. The participants completed these tasks while listening to music or no music at all. The results showed that while music was playing, 88% of participants produced their most accurate test results and 81% completed their fastest work. David Lewis, chairman of Mindlab International, toldThe Telegraph, "Music is a very powerful management tool if you want to increase not only the efficiency of your workforce but also their emotional state... _ are going to become more positive about the work." However, you may have a list of your favorite songs, but not all kinds of music match all homework. For maths or other subjects involving numbers or attention to detail, you should listen to classical music, the study found. In the study, pop music enabled participants to complete their tasks 58% faster than when listening to no music at all. If you are reviewing your English writing, pop music is the best choice, as it is the best kind for spell checking. It cut mistakes by 14%, compared to listening to no music. After finishing your homework, do you often take time to check your answers? Maybe, some dance music is suitable for you. Question: What did the participants have to do in the study? - Persuade their parents to listen to music. - Listen to the same music together. - Try their best to choose the most suitable music. - Finish tasks with music or without music at all.
Ans: Finish tasks with music or without music at all.

Ques:Read the following article and select the best answer. Article: Walls and wall building have played a very important role in Chinese culture. In ancient times, not only towns and villages, but also the houses and the temples within them were surrounded with walls. Also, the houses had no windows overlooking the street. Thus, walking in a city would give the feeling of wandering around a huge maze . The word "city" in Chinese also means "wall". The god of walls and mounts, whose duty was, and still is, to protect and be responsible for the welfare of the residents in these cities, villages, houses and temples. So a great and extremely hard task such as constructing a wall, which was supposed to run the length of the country, might not sound absurd . However, it is indeed a common mistake to think of the Great Wall as a single building structure, and it would also be a mistake to assume that it was built during a single dynasty. Actually, several dynasties somehow contributed to the construction of the Great Wall, the foundations of which had been laid many centuries ago. It was during the fourth and third centuries BC that warring states started building walls to protect their kingdoms, both against one another and against the northern nomads . The Great Wall played an important role in the growth of Chinese economy in history. Many settlements were established along the new border. Armies were instructed to reclaim wasteland and to plant crops there. Also, roads and canals were built. All of the work greatly helped increase the country's trade and cultural exchanges with many remote areas and also with the southern, central and western parts of Asia. Question: Why did ancient Chinese cities seem like a maze? - Because there were usually more walls than houses. - Because the outside walls of houses had no windows. - Because the word "city" means "wall". - Because there were legends about the god of walls.

Ans:
Because the outside walls of houses had no windows.