Read the following article and select the best answer. Article: First lady Michelle Obama turns 50 on Friday, Jan. 17, 2014. Michelle Obama has spent the first half-century of her life breaking barriers and checking off a series of firsts. Now, as she reaches her milestone birthday Friday, the nation will be watching to see in what other areas she will leave her mark. Five years after moving into the White House, and without a re-election campaign to worry about, she has more room to relax in her role and, political watchers say, possibly become more vocal on political issues in the three years left in office. So far, critics have complained about Michelle's silence on issues where they expected to hear her voice: Last year, at the start of her husband's second term, she disappointed advocates for tighter gun-control measures after she failed to push harder on the issue in response to the massacre at Sandy Hook Elementary School in Newtown, Conn. She also disappointed some feminists who wanted her to defend their causes instead of falling back on her self-described role as the nation's "mom-in-chief." Nor did she handle racial issues during her second term, as some had expected. "The most important thing to remember is, whether you are black, white or Hispanic, you're the first lady and the president of all the people in the United States. That's a huge melting pot, so to reinforce that she's African American over anything else would not be wise," said Anita McBride, who directs programming and national conferences on the legacies of America's first ladies and their historical influence at American University. Valerie Jarrett, a top White House adviser and a close friend of the Obamas, said the first lady doesn't want to " _ " "She really wants to have a maximum impact and to do that in fewer areas," Jarrett told the Associated Press. "That, she said, "is better than trying to take on every single possible cause." But Robert Watson, a Lynn University professor, said he expects Obama to "go a little harder at issues" over the next several years. "Second-term first... Question: Critics were disappointed with Michelle because _ . - she didn't put gun-control measures into effect - she failed some feminists to stand out to be a career woman - she didn't solve some racial problems - she failed to voice her opinion on some issues
she failed to voice her opinion on some issues

Read the following article and select the best answer. Article: Since the 1970s, scientists have been searching for ways to link the brain with computers.Brain-computer interface(BCI) technology could help people with disabilities send commands to machines. Recently, two researchers, Jose Millan and Michele Tavella from the Federal Polytechnic School in Lausanne, Switzerland, demonstrated a small robotic wheelchair directed by a person's thoughts. In the laboratory, Tavella operated the wheelchair just by thinking about moving his left or right hand.He could even talk as he watched the vehicle and guided it with his thoughts. "Our brain has billions of nerve cells.These send signals through the spinal cord to the muscles to give us the ability to move.But spinal cord injuries or other conditions can prevent these weak electrical signals from reaching the muscles," Tavella says."Our system allows disabled people to communicate with external world and also to control devices." The researchers designed a special cap for the user.This head cover picks up the signals from the scalp and sends them to a computer.The computer interprets the signals and commands the motorized wheelchair. The wheelchair also has two cameras that identify objects in its path.They help the computer react to commands from the brain. Prof.Millan, the team leader, says scientists keep improving the computer software that interprets brain signals and turns them into simple commands."The practical possibilities that BCI technology offers to disabled people can be grouped in two categories: communication, and controlling devices.One example is this wheelchair." He says his team has set two goals.One is testing with real patients, so as to prove that this is a technology they can benefit from.And the other is to guarantee that they can use the technology over long periods of time. Question: The team will test with real patients to _ - make profits from them - prove the technology useful to them - make them live longer - learn about their physical condition
prove the technology useful to them

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Read the following article and select the best answer. Article: Last spring, members of Alaska's Troop 34, based in Fairbanks, trudged out into the snowy wilderness to take part in their state's Take a Kid Trapping program. In many parts of the state, beavers are pests and need to be controlled. The 10-to-12-year-old girls found out where beavers lived, set traps, and skinned the two animals they caught. The girls hope to catch ten more beavers so that the entire troop can make mittens and hats with the fur. They also want to cook beaver meat. Troop leaders and members say the Scouts are doing a good deed by helping control the state's beaver population. But animal-rights activists say trapping is cruel. They want the Girl Scouts to stop in their tracks. Beavers aren't only causing a problem in Alaska. Residents in Sampson County, N.C., have turned to a local committee to help them battle the growing beaver population there. County landowners are frustrated after the county spent more than $ 50,000 in eight years trying to reduce the beaver population through a government program. The joint state and federal program included paying money to trappers for every beaver carcass they trapped. Many local residents say that the program didn't work because there were too few trappers. That's why the county set up its own committee to investigate other ways to control the area's beaver population. The county will rely on its own beaver-trapping program. It has hired a trapper to set traps in various areas. The county will pay $10 for every beaver carcass. Why do many people say that beavers are a nuisance? For beavers to survive, they need lots of water. Water provides the large rodent with a place to hide from meat - eating animals. Beavers also store food underwater for the winter. When there's not enough water in a particular area, beavers get busy building dams. Beaver dams can cause major flooding and damage to the surrounding countryside as the animals cut down trees to use in their construction projects. Beavers build canals to transport heavy objects. Question: Why does the troop hope to catch ten more beavers? - To fulfill their task. - To sell them for money. - To get enough fur. - To exchange them for mittens and hats.
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To get enough fur.