Oprah Winfrey, the queen of American daytime talk TV, is considered one of the most powerful women in the world.Now, after 25 years' hosting The Oprah Winfrey Show, the star has announced she is calling it quits. According to the Los Angeles Times, the move "signals the beginning of the decline for the daytime talk show." More women are working full-time jobs, and people are turning to cable   and pre-recorded shows for their entertainment. It may be that Oprah isn't quitting so much as moving on.She has created the Oprah Winfrey Network (OWN), and will most likely move her show to the network.If audiences around the world need Oprah, they well know where to look. Oprah Winfrey was born to a single teenage mother in a small town in rural Mississippi, US.As a child, she lived with poverty and abuse.But she got a job at a local radio station, where her honesty, emotional style won her many fans.She quickly rose through the ranks of radio and television before launching her own production company and starting her own show. Oprah's talk show was not the first of its kind, but it quickly became the best and most popular.It made talk shows popular, and others jumped in to start similar shows.But while other talk shows turned ugly, featuring guests who argued and attacked each other with chairs, _  "Part of her power lies in the fact that her life story resonates   with her audience, as a kind of version of the American dream," writes Kevin Connolly, a reporter with the BBC. She became a star because of the way she opened up about her problems to her audience.She shared her own struggles with relationships and weight.She focused on self-help.Connolly believes "something in her honesty and her sometimes painfully emotional directness struck home with a certain type of American". According to the text, Oprah   _  . A) always volunteers to help those who need help B) has practiced presentational skills since she was young C) believes that one should rely on himself to solve problems D) calls on women to work full-time jobs
C

Exercise may help to safeguard the mind against depression  through previously unknown effects on working muscles, according to a new study involving mice. Mental health experts have long been aware that even mild, repeated stress can contribute to the development of depression and other mood disorders in animals and people. Scientists have also known that exercise seems to cushion against depression. But precisely how exercise, a physical activity can reduce someone's risk for depression, a mood state, has been mysterious. So for the new study, researchers at the Karolinska Institute in Stockholm studied the brains and behavior of mice in a complicated and novel fashion. We can't ask mice if they are feeling cheerful or in low spirits. Instead, researchers have pictured certain behaviors that indicate depression in mice. If animals lose weight, stop seeking out a sugar solution when it's available -- because, probably, they no longer experience normal pleasures -- or give up trying to escape from the cold-water zone just freeze in place, they are categorized as depressed. And in the new experiment, after five weeks of frequent but low-level stress, such as being lightly shocked, mice displayed exactly those behaviors. They became depressed. The scientists could then have tested whether exercise blunts   the risk of developing depression after stress by having mice run first. But, frankly, from earlier research, they wanted to know how, so they bred pre-exercised mice. A wealth of earlier research by these scientists and others had shown that aerobic exercise, in both mice and people, increases the production within muscles of an enzyme   called PGC-1alpha. The Karolinska scientists suspected  that this enzyme somehow creates conditions within the body that protect the brain against depression. Then, the scientists exposed the animals, which without exercising, were in high levels of PGC-1alpha to five weeks of mild stress. The mice responded with slight symptoms of worry. But they did not develop depression.... The researchers at the Karolinska Institute in Stockholm conducted the new study hoping to know   _  . A) if exercise cushions against depression B) what can lead to depression in animals and people C) if stress can contribute to the development of depression D) how exercise contributes to reducing someone's risk for depression
D

India has many festivals, with some celebrations that last for weeks. However, none of them come even close to Holi, India's most colorful and fun festival. Celebrated on the day following the full moon, this year's festival happens to be on March 19th. As with most Indian festivals, this one also has many different folk stories. Most of them center around the success of good over evil. The most popular one is about a king, who hates his son Prahlada for loving the creator of the Universe--Lord Vishnu. When every attempt to stop him fails, his sister, Holika believed to be immune  to fire, joins in the effort by inviting the young boy to sit with her inside a huge fire. Helped by the power of Lord Vishnu, Prahlada escapes safely, while the evil Holika is burned to death. To remember this event, huge outdoor fires are lit in the night before Holi in order to clean the air of evil spirits and to celebrate the death of the evil. So what's so great about this day? While there are some fun parades  and folk songs and dance performances, the most fun of all is walking to the streets and splashing  people with water guns and dry colors and even covering them with entire buckets of colored water. On this day, everybody is _ , no matter how old or how young. At about midday, the splashing comes to an end and people living close to oceans or rivers usually take a bath in the water to clean themselves before going home to a delicious home-made big dinner and a well-deserved short sleep, following this full day of fun and activities. After the fun activities, people living close to oceans or rivers often take a bath because   _  . A) they have got dirty with dry colors and colored water B) going home with colored water means bad luck C) they believe clean water will bring good luck D) taking a bath shows their true love for Lord Vishnu

A