Read the following article and select the best answer. Article: Harvard student Julie Zauzmer turned 20 on January 22, and her birthday couldn't have been better: She got to working the overnight shift at the Harvard Square Homeless Shelter. That might seem an extraordinary act of selflessness for someone turning 20. But there's increasing evidence that commitment to community service is becoming much more ordinary to today's young adults. "Young adults are doing more volunteer service than in any point in history,'' said Scott Seider, an assistant professor of education at Boston University who studies the civic development of young adults. At Harvard, the Winthrop Street Homeless Shelter is one of 86 social service programs associated with the Phillips Brooks House Association, which is a student-run nonprofit organization. Students can work with deaf children, bring pets to nursing homes, and prepare Chinese students to become US citizens, and so on. Volunteerism develops well outside of colleges, too. Applications to AmeriCorps have risen to a very high level, jumping from 91,399 in 2008 to 258,829 in 2010. City Year, which puts young people in high-poverty schools as tutors and mentors for at-risk students, has had a 140 percent increase in applications since its 2007-2008 service year. Citizen Schools, which uses volunteers to work with students in middle schools, has had a 28 percent jump in applicants between 2008 and 2009. "Most of my friends know it's their duty to give back before they settle down,'' said Samantha Wolf, a 23-year-old Boston University graduate serving with City Year in a Mattapan school. City Year corps member Antonio Gutierrez, 22, graduated last year from Union College in Schenectady, N.Y., and is applying for admission to law schools, but this year he is tutoring and mentoring students at the Blackstone Elementary School in the South End. "I grew up in similar circumstances,'' said Gutierrez, who said he was a weak student until enrichment programs changed his academic trajectory . Raised by a single mother in low-income housing across the... Question: We learn from what Scott Seider says in Paragraph 3 that young people today _ . - study harder than before - do more volunteering than ever before - don't care much about others - like to find jobs in their communities
do more volunteering than ever before

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Read the following article and select the best answer. Article: The immune system is the body's defender. It identifies, tracks down, and destroys troublemakers before they can hurt the body. Those troublemakers may be, for example, bacteria from a cut or splinter, a measles germ, a cold bug, or even a cancer cell. These invaders try to take over our tissues and feed off our bodies' nutrients. If they succeed, we become sick or, sometimes, even die. It's the job of our immune systems to destroy these invaders before they destroy us. Say you picked up a flu virus last week. Perhaps it entered your body through a cut, from a drinking glass, or from the air you breathe. Of course, you didn't feel it, but the virus made its way into your bloodstream. As soon as it entered your body, it began to reproduce. Viruses have only one goal: to take over your cells. Once inside your body, viruses try to enter cells and disrupt their normal work. If left alone, these viruses would hurt so many cells that you would weaken, or worse, get a serious illness. But this flu virus should not be so complacent as it seems to be. As it reproduces in your bloodstream, the virus is met by a certain kind of white blood cell, the lymphocytes. The _ are the foot soldiers that keep you alive. The number of lymphocytes in your body is hard to imagine. Thousands of them could fit in the period at the end of this sentence. Your body holds about a trillion --that's 1,000,000,000,000 of them, or about 3,000 in every drop of blood. _ Some of these lymphocytes pass through a small walnut-sized organ called the thymus. The thymus is the base of the neck. Here, special hormones turn lymphocytes into fighting cells, called T cells. T cells have one terrific talent: They can tell the difference between friend and foe; what should be in our bodies and what shouldn't. They do not affect the body 's healthy cells. Yet they attack everything that is foreign to our bodies, such as germs, transplants, and even our own cells which have become abnormal, as in the case of cancer. Question: The last sentence in para 5 "since you began reading this sentence,over 800,000 of them have been created and destroyed" implies that _ . - because you read this sentence,a large number of lymphocytes have been consumed - .this sentence contributes to the increase of the number of lymphocytes in your body - the number of lymphocytes in your body is extremely large - you would not realize that lymphocytes reproduce themselves rapidly but for this sentence
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the number of lymphocytes in your body is extremely large

Question: Read the following article and select the best answer. Article: You never see him, but they're with you every time you fly. They record where you are going, how fast you're traveling and whether everything on your airplane is functioning normally. Their ability to withstand almost any disaster makes them seem like something out of a comic book. They're known as the black box. When planes fall from the sky, as a Yemeni airliner did on its way to Comoros Islands in the India ocean June 30, 2009, the black box is the best bet for identifying what went wrong. So when a French submarine detected the device's homing signal five days later, the discovery marked a huge step toward determining the cause of a tragedy in which 152 passengers were killed. In 1958, Australian scientist David Warren developed a flight-memory recorder that would track basic information like altitude and direction. That was the first mode for a black box, which became a requirement on all U.S. commercial flights by 1960. Early models often failed to withstand crashes, however, so in 1965 the device was completely redesigned and moved to the rear of the plane - the area least subject to impact - from its original position in the landing wells . The same year, the Federal Aviation Authority required that the boxes, which were never actually black, be painted orange or yellow to aid visibility. Modern airplanes have two black boxes: a voice recorder, which tracks pilots' conversations, and a flight-data recorder, which monitors fuel levels, engine noises and other operating functions that help investigators reconstruct the aircraft's final moments. Placed in an insulated case and surrounded by a quarter-inch-thick panels of stainless steel, the boxes can withstand massive force and temperatures up to 2,000degF. When submerged , they're also able to emit signals from depths of 20,000 ft. Experts believe the boxes from Air France Flight 447, which crashed near Brazil on June 1,2009, are in water nearly that deep, but statistics say they're still likely to turn up. In the approximately 20 deep-sea crashes... Question: . What information could be found from the black box on the Yemeni airliner? - Data for analyzing the cause of the crash. - The total number of passengers on board. - The scene of the crash and extent of the damage. - Homing signals sent by the pilot before the crash.
Answer:
Data for analyzing the cause of the crash.