Question: Scientists have been puzzled by the phenomenon that migrating birds fly not just in groups all the time, but in "V" formations and they have tried to figure out what benefit birds get from this particular formation. Now, a research group from University of London may have found the answer -- migrating birds fly in a "V" to save energy, according to a study published in the journal Nature. When a bird flaps  its wings, it stirs the air around it and causes it to move indifferent directions. Scientist found in the study that the air creates an upward-moving wave at the tips of the wings, which means that if a bird flies around the wingtips of another bird, it can get a boost  from the rising air and therefore use less energy to stay in the air. Apart form the "free ride" strategy, scientists were also surprised to observe that migrating birds timed their wing beats and adjusted their positions in a very precise way to maximize the lifting effect while avoiding areas where the air move downward. "They're able to sense what's going on from the bird in front, where this 'good air' is coming from and now how to position themselves perfectly in it," lead researcher Steven Portugal told BBC. In fact, the "V" formation has long thought to help birds fly more efficiently . A previous study showed that birds' heart rates went down when they were flying together in a "V" formation. Jet fighters were also found to be able reduce their energy use by up to 18% by staying near the wingtips of other jet fighters. Both of these findings led scientists to suspect that the "V" formation had an efficiency purpose, but until now they still lack proof. "For scientists, the new study provides an insight into an interesting natural phenomenon. But it could mean even more for aircraft companies -- helping them understand how they can _ that with their plane formations to save fuel, said Portugal." According to the recent study, when birds migrate  _  . A) they don't change their lead birds during the whole journey B) they fly in "V" formations to protect themselves against enemies C) they form the shape of a "V" to make best use of the lifting effect D) the air they stir around makes it hard for the birds behind to fly fast
Answer: C

Question: Have you ever wanted to travel back through time and see what life was like at the beginning of man? Well, museums can make history come alive. And one museum in particular can take you on an exciting journey from the beginning of human culture to the present day. It is the British Museum. Being one of the largest museums in the world, it is home to over 7 million objects from all the world's continents. While most of us may not have the chance to visit London, we can catch a glance of the treasures it holds in Beijing. From December 10 to Februry 10, more than 100 cultural relics will be on show in the Palace Museum. Named "Britain and the World", a range of pencil sketches, watercolor paintings, sculptures and many other objects have traveled to China. There are several Chinese objects on show. But "the British Museum got them before 1830 mainly by trade," said Ma Jige, deputy director of the Exhibition Department of the Palace Museum. In fact, there are more than 23,000 Chinese relics in the British Museum, including national treasures like gems, artwork and ancient bronze ware objects. The museum is famous for its exquisite Chinese paintings. Picture of Lady Officials by Gu Kaizhi, a top painter of the Eastern Jin Dynasty (AD 317-420), is there. The British Museum also holds 13,700 Buddhist records from the Dunhuang Grottoes in Gansu Province. We can learn from the article that   _  . A) the British Museum is the largest museum in the world B) the Palace Museum houses over 7 million objects from all over the world C) part of the British Museum's collection is available in the Palace Museum D) the two museums will be combined into one
Answer: C

Question: HONG KONG -- Hong Kong Disneyland is too crowded, a senior Chinese tourism official said today, hinting that another Disney Park is necessary to accommodate demand from China's huge population. The comments by Shao Qiwei, director of China's State Administration of Tourism, came a day after Shanghai's mayor Han Zheng said the city was preparing to build China's second Disney theme park. "China has a very large population. We now have 1.3 billion people. The market is very large. As far as I know, Hong Kong Disneyland is now very crowded," said Shao, whose comments were broadcast on Hong Kong's Cable TV. The Hong Kong theme park, which opened in September, was widely criticized in January when it turned away hundreds of Lunar New Year holiday makers from mainland China because the park was full. Chaos  erupted when angry crowds tried to force their way into the park. The embarrassing incident prompted a public apology from Hong Kong Disneyland Managing Director Bill Ernest and a dressing down from Hong Kong's leader Donald Tsang. Authorities are carefully studying the issue of overcrowding in preparation for the possible building of the Disney park in Shanghai, Shao said. The official Xinhua News Agency reported Tuesday that no agreement has been reached on the park in Shanghai, quoting senior vice president of Walt Disney Parks and Resorts, Leslie Goodman. Hong Kong Disneyland is a joint venture between The Walt Disney Co. and the local government, which shouldered the bulk of the park's construction fees. Hundreds of visitors from Mainland China got angry because   _  . A) the services in the park were not as good as expected B) they were not allowed to go into the park C) the park was too crowded D) chaos happened at the entrance to the park
Answer:
B