Read the following article and select the best answer. Article: It was August 10, 2011. Diana Nyad was dozens of miles into her dream to complete a 103-mile swim from Cuba to Key West. Because of the currents in the Florida Straits, Nyad would have to last 60 hours-if everything went perfectly. For two years, this dream of swimming from Cuba to Florida had been part of her every waking hour. She was about to turn 60. "I wanted to be filled with commitment to the best of myself so that 1 wasn't looking back later saying, 'What have I done with my life?''' says Nyad. Those extreme physical struggles are not new to her. In 1974, 25-year-old Nyad became the first person to swim across Lake Ontario against the current. A year later, Nyad's 28-mile swim around the island of Manhattan made the front page of the New York Times. "Physically, I'm stronger. I weigh a lot more," Nyad said after a training swim in Key West in June. "There are also mental advantages to being older," says Steven Munatones, an expert in swimming. Feeling a sharp pain in her right shoulder, she changed the angle of stroke , telling herself to go gently until her hand caught the water. In the 17thhour, she swam over to the boat, and the crew located a pain reliever. Nyad took it. She lay on her back, rolled onto her belly and continued swimming, and then she'd turn on her back again, gasping, unable to fill her lungs. "I'm trying to make it. I'm barely going forward. I feel so sick. This has been my dream forever, but I can hardly make it another hour," Nyad told David Marchant, the boat's navigator . Between the 23rd and 27th hours, Nyad had gone just five miles. "OK, Diana, I'm going to touch you, and it's going to be over," Stoll said. Nyad agreed. And with that, 29 hours and 43 minutes after she'd leaped into the water, the swim came to an end. "She just wouldn't quit. It was more amazing to see her not make it the way she fought than if everything had gone exactly right and she'd made it the whole way," says Mark Sollinger, who piloted Nyad's lead boat. At a press .conference in Key West... Question: We can learn from the passage that Nyad _ . - refused any help as she struggled in the water to make it - has given up the dream of swimming across the Florida Straits - appeared on the front page of the New York Times at the age of25 - began the swim from Cuba to Florida when she was about 60 years old
began the swim from Cuba to Florida when she was about 60 years old

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Read the following article and select the best answer. Article: A new study suggests that early exposure to germs strengthens the immune system. That means letting children get a little dirty might be good for their health later in life. The study involved laboratory mice. It found that adult mice raised in a germ-free environment were more likely to develop allergies, asthma and other autoimmune disorders. There are more than eighty disorders where cells that normally defend the body instead attack tissues and organs. Richard Blumberg,who led the study,is a professor at Harvard Medical School in Boston,Massachusetts. He says,in 1989,medical researchers who sought to explain these diseases, first discovered that the increasing use of antibacterial soaps and other products, especially early in life, could weaken immune systems. Now, Dr. Blumberg and his team have what is the first biological evidence to link early exposure to germs to stronger adult immune systems. They say this exposure could prevent the development of some autoimmune diseases. In the adult germ-free mice, they found that inflammation in the lungs and colon was caused by so-called killer T cells. These normally fight infection. But they became overactive and targeted healthy tissue--an autoimmune condition seen in asthma and a disease called ulcerative colitis . Dr. Blumberg says the mice raised in a normal environment did not have the same reaction. He says their immune systems had been "educated" by early exposure to germs. Rates of autoimmune disorders are rising worldwide, but mostly in wealthier, industrialized countries. According to Dr. Blumberg, it might be high time that people were warned to be more careful with the early use of antibiotics and the prescription from their doctors. Rob Dunn is a professor of ecology and evolutionary biology at North Carolina State University in Raleigh. He says the new study does not mean people should stop washing. "Wash your hands , but don't do it with antibacterial soap. Let your kids play in a reasonable amount of dirt and get outside and get... Question: Who first found immune systems might get harmed by overly using antibacterial products? - A professor of ecology and evolutionary biology. - A professor at Harvard Medical School in Boston. - Medical researchers who tried to explain autoimmune disorders. - Medical researchers who tried to treat autoimmune disorders.
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Medical researchers who tried to explain autoimmune disorders.

Read the following article and select the best answer. Article: Nuclear power's danger to health, safety, and even life itself can be summed up in one word: radiation. Nuclear radiation has a certain mystery about it, partly because it cannot be detected by human senses. It can't be seen or heard, or touched or tasted, even though it may be all around us. There are other things like that. For example, radio waves are all around us but we can't detect them, sense them, without a radio receiver. Similarly, we can't sense radioactivity without a radiation detector. But unlike common radio waves, nuclear radiation is not harmless to human beings and other living things. At very high levels, radiation can kill an animal or human being immediately by killing masses of cells in vital organs. But even the lowest levels can do serious damage. There is no levels of radiation that is completely safe. If the radiation does not hit anything important, the damage may not be serious. This is the case when only a few cells are hit, and if they are killed immediately. Your body will replace the dead cells with healthy ones. But if the few cells are only damaged, and if they reproduce themselves, you may be in trouble. They can grow into cancer. Sometimes this does not show up for many years. This is another reason for some of the mystery about nuclear radiation. Serious damage can be done without the victim being aware at the time that damage has occurred. A person can be irradiated and feel fine, then die for cancer five, ten, or twenty years later as a result. Or a child can be born weak as a result of radiation absorbed by its grandparents. Radiation can hurt us. We must know the truth. Question: If a human being is hit by nuclear radiation, he may _ . - die of cancer after many years - die immediately - have a child who may be born weak - all of the above
all of the above