Read the following article and select the best answer. Article: 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.... Question: Researchers asked a group of adult volunteers to complete three weeks of frequent endurance training in order to _ . - know if exercise can help to safeguard the mind against depression - know if they can endure 40 to 50 minutes of moderate cycling or jogging - ensure they can lose weight after moderate cycling or jogging - confirm the findings above are also relevant to people
confirm the findings above are also relevant to people

Read the following article and select the best answer. Article: Pierre is a 25-year-old penguin at the California Academy of Sciences.Due to his old age,he was going bald,which made him feel too cold to swim in the pool.Therefore,biologists at the academy had a wetsuit created for this penguin to help him get back in the swimming pool. Unlike marine mammals,which have a layer of blubber to keep them warm,penguins depend on their waterproof feathers.Without them,Pierre was unwilling to jump into the swimming pool and ended up trembling on the side of the pool while his 19 peers played in the water. "He was cold:he would shake,"said Pam Schaller,a senior biologist.Schaller first tried a heat lamp to keep Pierre warm.Then she got another idea:if wetsuits keep humans warm in the cold Pacific,why not make one for Pierre? Schaller designed the suit,which covered Pierre's body and had small openings for his flippers. "I would walk behind him and look at where there were any gaps.and cut and refit until it looked like it was extremely suitable."she said. One concern was that the other penguins would reject Pierre in his new suit,but in fact,they accepted his new look.He swam freely and got along with others well,although he was the only penguin with a black stomach. Schaller couldn't say for sure whether the wetsuit allowed Pierre to recover his fine feathers,but" certainly we were able to keep him comfortable during a period of time that would have been very difficult for him to stay comfortable". Pierre will take off his suit after his new feathers grow back. Question: Schaller followed Pierre in order to see _ . - whether other penguins would reject him - if anywhere of wetsuit needed to be cut and refit - if the wetsuit kept warm - whether the wetsuit would keep the feathers from recovering
if anywhere of wetsuit needed to be cut and refit

Read the following article and select the best answer. Article: A 13-year-old Shenzhen girl has written a novel about life in junior high school, and the book is expected to hit the city's bookshelves in June, the Shenzhen Economic Dailyreported on Thursday. "A Fresh Summer Day," a 180,000-character novel which Zhao Yue completed writing in three months, is in fact Zhao's second published book. Her first book, "A Better Present," is a collection of the articles she wrote when she was still a primary school student. Zhao is a Junior One student of a middle school in Longgang District. She started writing the novel after her first book was published. "I was very much motivated to write a new book when I saw many of my schoolmates reading my first book," said Zhao. She added that she wrote most of the novel at night, sometimes until the early hours of the morning. "I attended school as usual during the three months of writing. I felt all right every day even though I slept for only four hours a day," said the girl. "A Fresh Summer Day" is about puppy love between two junior high school students, which is becoming very common among young children, the paper said. AShenzhen Economic Daily reporter who read the draft of Zhao's story said the plot develops smoothly and naturally, while the descriptions of the characters' feelings are true. Zhao said the story was based on interviews she carried with some of her fellow students, "I myself don't have such a story to tell yet." Zhao has loved writing since early childhood. Question: It can be learned from the passage that _ . - Zhao Yue doesn't like puppy love - Zhao Yue's parents knew nothing about her second novel - the reporter helped Zhao Yue publish the novel - the reporter thinks well of the second novel
the reporter thinks well of the second novel