Read the following article and select the best answer. Article: Three astronauts returned to Earth safely on Wednesday after a successful 15-day mission , marking another step forward towards the country's goal of building a manned space station by 2020. Zhang Youxia, commander-in-chief of China's manned space program, said the Shenzhou X mission was a "complete success". The Shenzhou X landed safely in north China's Inner Mongolia Autonomous Region at about 8:07 a.m. on June 26, 2013. All three astronauts were in good physical condition. Nie Haisheng, commander of the Shenzhou X crew and a second-time space traveler, was the first to get out of the bowl-like module , followed by Wang Yaping, the only female astronaut of the mission, and Zhang Xiaoguang. During a brief welcoming ceremony held at the landing area, the astronauts waved happily to a crowd consisting of officers, the search and recovery team, and health personnel. "It feels really good to be back home," said astronaut Nie Haisheng. "We are dreamers, and we have now realized our dream," said Zhang Xiaoguang. "Our space dream knows no limit, and our hard work will never stop," he said. Compared with its previous mission Shenzhou IX last year, the Shenzhou X is no longer experimental but considered an applicable shuttle system for sending astronauts and supplies to orbiting modules. The mission aims to further test technologies designed for docking and supporting astronauts' stay in space, as well as to use new technologies related to the construction of a space station. In its 15-day journey in space, Shenzhou X docked with the orbiting space lab Tiangong-1 twice, once through automatic operation and the other manual .The Tiangong-1 space lab has been in orbit for more than 600 days. It's designed to work for two years. The module is considered the first step in building a permanent space station in the future. And the astronauts spent 12 days in Tiangong-1, where they conducted space medical experiments, technical tests and gave a science lesson to students on Earth on June 19 about basic physics principles.... Question: We can learn from the passage that _ . - Nie Haisheng is the only male astronaut of the mission - The Tiangong-1 space lab was founded in 2012 - China is the second country to give a space class - the Tiangong-1 was mainly designed to serve Shenzhou X
China is the second country to give a space class

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Read the following article and select the best answer. Article: If you know the following fact, you'll understand why many people suffer from foot problems. The average person walks the equivalent of three times around the Earth in a lifetime. That is enormous wear and tear on the 26 bones, 33 joints and more than 100 muscles that make up the foot. In a recent survey for the American Podiatric Medical Association, 53 percent of respondents reported foot pain so severe that it affected their daily function. On average, people develop pain in their 60s, but it can start as early as the 20s and 30s. And usually women give care to their feet while men don't. "A lot of people think foot pain is part of the aging process and accept it, and walk with pain," said Dr Andrew Shapiro. Though some foot problems are inevitable, their progress can be slowed. The following questions will help you assess whether you should take more preventive action as you age. Do you have flat feet or high arches ? Either puts feet at risk. Shoes that support the arch and heel can help flat feet. People with high arches should look for roomy shoes and softer padding to absorb the shock. Proper exercises also strengthen muscles, supporting the foot. Do your shoes fit? In the survey, more than 34 percent of men said they could not remember the last time their feet were measured. 20 percent of women said that once a week they wore shoes that hurt, and 8 percent wore painful shoes daily. Feet flatten and lengthen with age, so if you still stick to the shoe size you wore at the age of 21, get your feet measured. Do you walk? Putting more mileage on your feet is the best way to exercise the muscles and keep them healthy. Question: Which of the following statements best explains foot pain? - Not all of it can be avoided. - People can't slow its process. - Walking more will stop foot pain. - Preventive actions can't work well.
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Not all of it can be avoided.

Ques:Read the following article and select the best answer. Article: WASHINGTON--A baby born with the virus that causes AIDS appears to have been cured, scientists announced Sunday, describing the case of a child from Mississippi who's now 2.5 and has been off medication for about a year with no signs of infection. There's no evidence that shows that the child will remain healthy, although complex testing uncovered just traces of the virus' genetic material still lingering . If so, it would mark only the world' s second reported cure. Specialists say Sunday's announcement, at a major AIDS meeting in Atlanta, offers promising clues for efforts to remove HIV infection in children, especially in African countries where too many babies are born with the virus. "You could call this about as close to a cure," Dr. Anthony Fauci of the National Institutes of Health, who is familiar with the findings, told The Associated Press. A doctor gave this baby faster and stronger treatment than usual, starting a three-drug mixture within 30 hours of birth. That was before tests confirmed the infant was infected and not just at risk from a mother whose HIV wasn't diagnosed until she was in labor . "I just felt like this baby was at higher-than-normal risk, and deserved our best shot," Dr. Hannah Gay, a pediatric HIV specialist at the University of Mississippi, said in an interview. That fast action apparently knocked out HIV in the baby's blood before it could form hideouts in the body. Those so-called reservoirs of dormant cells usually rapidly reinfect anyone who stops medication, said Dr. Deborah Persaud of Johns Hopkins Children's Center. Next, Persaud's team is planning a study to try to prove that, with more aggressive treatment of other high-risk babies. "Maybe we'll be able to block this reservoir seeding." Persaud said. No one should stop anti-AIDS drugs as a result of this case, Fauci warned. Question: We can infer that HIV is difficult to treat because _ . - HIV is not easy to diagnose at the early time - HIV is so clever that it hides when it feels danger - people with HIV are too shy to receive the treatment - people with HIV are too lazy to stop anti-AIDS drugs

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HIV is so clever that it hides when it feels danger