*Question*
I'm taking a test and have to guess the right answer to the question after the article. Article: 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." Question: What is the significance of the new study according to this article? Options: A: It might inspire aircraft companies to think of ways to improve efficiency. B: It has proved that the "V" formation can improve in efficiency in many fields, C: It has led scientists to discover that birds' heart rates go down when they fly in a "V". D: It shows that the best formation of jet fighters in battle should be a "V" formation.
**Answer**
A

*Question*
I'm taking a test and have to guess the right answer to the question after the article. Article: When asked to point out one or two things that are most important to themselves, many put friends ahead of homes, jobs, clothes and cars. A true friendship carries a long history of experience that determines who we are and keeps us connected. It is a treasure we should protect. Unfortunately, the better friends you are, the more probably you'll have disagreements. And the result can be what you don't want--an end to the relationship. The good news is that most troubled friendships can be mended. First, don't let your pride get in your way. Most of us can forgive each other when differences are brought out in the open. Second, apologize when you're wrong -- even if you've been wronged. Over the course of a friendship, even the best people make mistakes. Sometimes, it may be best if the _ takes the lead and apologizes. When you apologize, give your friend a chance to admit that he has been wrong. Third, see things from your friend's point of view. And finally, accept that friendships change as our needs and lifestyle change. Making friends can sometimes seem easy. The hard part is keeping the connections strong during the natural ups and downs that have an effect on all relationships. My suggestion: consider friendship as an honor and a gift, and worth the effort to treasure and nurture . Question: According to the passage, a friendship can be long only if _ . Options: A: we have much in common B: we know our friends' mistakes C: we treat our disagreements wisely D: we have known one another her desires
**Answer**
C

*Question*
I'm taking a test and have to guess the right answer to the question after the article. Article: Tu Youyou has become the first Chinese woman to win a Nobel Prize, for her work in helping to create an anti-malaria medicine. The 84-year-old's route to the honour has been anything but traditional. In China, she is being called the "three nos" winner: no medical degree, no doctorate, and she's never worked overseas. In 1967, malaria, a then deadly disease, spread by mosquitoes was _ Chinese soldiers fighting Americans in the jungles of northern Vietnam. A secret research unit "Mission 523 "was formed to find a cure for the illness. Two years later, Tu Youyou was instructed to become the new head of "Mission 523". "Mission523" read ancient books carefully for a long time to find historical methods of fighting malaria. When she started her search for an anti-malarial drug, more than 240,000 compounds around the world had already been tested, without any success. Finally, the team found a brief reference to one substance, sweet wormwood , which had been used to treat malaria in China around 400 AD. The team took out one active compound in wormwood, and then tested it. But nothing was effective until Tu Youyou returned to the original ancient text. After another careful reading, she changed the drug recipe one final time, heating the compound without allowing it to reach boiling point. After the drug showed promising results in mice and monkeys, Tu Youyou volunteered to be the first human recipient of the new drug. " In any case, Tu Youyou is consistently praised for her drive and passion. One former colleague. Lianda Li, says Ms Tu is "unsociable and quite straightforward", adding that "if she disagrees with something, she will say it." Another colleague, Fuming Liao, who has worked with Tu Youyou for more than 40 years, describes her as a "tough and stubborn woman". Stubborn enough to spend decades piecing together ancient texts, she applies them to modern scientific practices. The result has saved millions of lives. Question: According to Para. I, we can learn that _ . Options: A: Tu is the first woman to win a Nobel Prize B: Tu has a medical degree C: Tu's road to success is not traditional D: Tu discovered a cure for malaria
**Answer**
C