user: Can trees talk? Yes, but not in words. Scientists have reasons to believe that trees do communicate with each other. Not long ago, researchers learned some surprising things. First a willow tree attacked in the woods by caterpillars   changed the chemistry of its leaves and made them taste so terrible that they got tired of the leaves and stopped eating them. Then even more astonishing, the tree sent out a special smell---a signal causing its neighbors to change the chemistry of their own leaves and make them less tasty. Communication, of course, doesn't need to be in words. We can talk to each other by smiling, raising our shoulders and moving our hands. We know that birds and animals use a whole vocabulary of songs, sounds, and movements. Bees dance their signals, flying in certain patterns that tell other bees where to find nectar for honey. So why shouldn't trees have ways of sending messages? It can be concluded from the passage that caterpillars do not feed on leaves that   _  . A) are lying on the ground B) have an unpleasant taste C) bees don't like D) have an unfamiliar shape
B

Staying positive through the cold season could be your best defense against getting ill, new study findings suggest. In an experiment that exposed healthy volunteers to a cold or flu virus, researchers found that people with a generally sunny character were less likely to fall ill. The findings, published in the journal Psychosomatic Medicine, build on evidence that a "positive emotional style" can help to protect us from suffering the common cold and other illnesses. Researchers believe the reasons may be both objective -- as in happiness improving immune function -- and subjective -- as in happy people being less troubled by a sore throat or runny nose. "People with a positive emotional style may have different immune responses to the virus," explained lead study author Dr Sheldon Cohen of Carnegie Mellon University in Pittsburgh. "And when they do get a cold, they may interpret their illness as being less severe." Cohen and his colleagues had found in a previous study that happier people seemed less likely to catch a cold, but some questions remained as to whether the emotional style itself had the effect. For the new study, the researchers had 193 healthy adults complete standard measures of personality characteristics, self-felt health and emotional style. Those who had a tendency to be happy, energetic and easy-going were judged as having a positive emotional style, while those who were often unhappy, tense and aggressive had a negative style. The researchers gave them nasal   drops containing either a cold virus or a particular flu virus. Over the next six days, the volunteers reported on any aches, pains or sneezing they had, while the researchers collected objective data. Cohen and his colleagues found that based on objective measures of nasal troubles, happy people were less likely to develop a cold. According to Dr Cohen's research, the reason why some people are unlikely to catch a cold may be that   _  . A) their cheerful mood benefits the immune system B) they have developed a certain way against flu virus C) they are less likely to have a sore throat and runny nose D) they have got a stronger self-confidence in their health
A

"Tomorrow is another day"---- this line has impressed various people at various times. It's now 70 years after _ appeared in the film, but it still seems to hold its power especially during an economic downturn. The phrase comes from a film adaptation of Margaret Mitchell's successful 1936 novelGone With the Wind. It's set in the American South and tells the story of a strong heroine, Scarlett O' Hara, who struggles to find love during the Civil War and, afterwards, of her strength in surviving the war and its hardships. Love story In a moment of despair, Scarlett finally realizes that her love belongs to Rhett Butler. For many audiences, it is the theme of love and struggle that has kept the movie alive. While the burning of Atlanta might seem irrelevant to today's viewers, the timeless theme of love keeps its ability to touch people. With a promise to her lover still in her mind, Scarlett chooses to stay in the midst of war and take care of Melanie. But her heart is broken when Rhett just walks away, leaving the woman that he once loved with cruel words, "Frankly, dear, I don' t give a damn." Great epic The film shows the love-hate relationship of these characters, but also American history, the fall of the Confederacy and the following period of Reconstruction in the South. The background made this film a true classic in the epic genre. When the film opened after World War II, French viewers loved it, and it reminded them of their fight against the Nazis. In 1940 Shanghai, during the War of Resistance Against Japanese Aggression, people stood in line for hours to watch this film, and saw the same suffering they were having as well as the hope and possibility of building a new homeland from the ruins. Each nationality could identify with the story and see it as a victory. In fact,Gone With the Windnever lost its charm and ability to inspire and amaze. Biggest of all time The film had five directors, 15-plus screenwriters, and an unexpected $3.9 million budget. The film brought in $ 200 million, which makes... The text is written mainly to   _  . A) celebrate the anniversary of Margaret Mitchell B) introduce how the film was directed and filmed C) throw light on the charm of the movie " Gone with the Wind" D) inspire people to struggle the economic downturn


assistant: C