56.Accordingtothesurvey,peopleleftaloneonadesertislandwouldmostwanttheir_.A.MP3playerB.dogC.spouse/partnerD.celebrity57.WhichofthefollowingistrueaboutGeorgeClooney?A.Hehasbeentrainedinwildernesssurvival.B.Hemaynotbeabletohelpyousurvive.C.HedoesnotthinkRoseaneisbeautiful.D.HeisthechoiceofmostSouthAfricanwomen.58. Thesurveyresultsareanalyzedintermsoftherespondents_.A. sex,ageandnationalityB.race,nationalityandsexC.marriage,ageandraceD.age,sexandmarriageBDeputy Agriculture Secretary Kathleen Merrigan sees an epidemic (流行病) sweeping across Americas farmland. It has little to do with the usual challenges, such as flood, rising fuel prices and crop-eating insects. The countrys farmers are getting older, and there are fewer people standing in line to take their place. National agricultural census (普查) figures show that the fastest-growing group of farmers is the part over 65. Merrigan is afraid the average age will be even higher when the 2012 statistics are completed.Merrigan, a former college professor, is making stops at universities across the country in hopes of encouraging more students to think about careers in agriculture. Aside from trying to stop the graying of Americas farmers, her work is made tougher by a recent blog posting that put agriculture at No. 1 on a list of “useless” college degrees. Top federal agriculture officials are talking about the posting, and it has the attention of agricultural organizations across the country.“There couldnt be anything thats more incorrect,” Merrigan said. “We know that there arent enough qualified graduates to fill the jobs that are out there in American agriculture.”In addition, a growing world population that some experts predict will require 70% more food production by 2050, she said.“I truly believe were at a golden age of agriculture. Global demand is at an all-time record high, and global supplies are at all-time record lows,” said Matt Rush, director of the Texas Farm Bureau. “Production costs are going to be valuable enough that younger people are going to have the opportunity to be involved in agriculture.”The Department of Agriculture has programs aimed at developing more farmers and at increasing interest in locally grown food. The National Young Farmers Coalition has also been pushing for state and federal policy changes to make it easier for new farmers.Ryan Best, president of Future Farmers of America, has been living out of a suitcase, traveling the country and visiting with high school students about careers in agriculture. The 21-year-old Best hopes his messagethat this is a new time in agriculturewill motivate the next generation to turn around the statistics. “Never before have we had the innovations (创新) in technology which haveled to agriculture in this country being the most efficient it has ever been,” he said. “Theres really a place for everybody to fit in.”59. What is the new challenge to American agriculture?A. Fewer and older farmers. B. Higher fuel prices.C. More natural disasters. D. Lower agricultural output.60. Why is Merrigan visiting universities across the country?A. To draw federal agriculture officials attention.B. To select qualified agriculture graduates.C. To clarify a recent blog posting.D. To talk more students into farming careers.61. According to Matt Rush, American agriculture will provide opportunities for younger people because_A. the government will cover production costsB. global food supplies will be even lowerC. investment in agriculture will be profitableD. America will increase its food export62. What do the underlined words “to turn around the statistics” in the last paragraph mean?A. To re-analyze the result of the national census.B. To increase agricultural production.C. To bring down the average age of farmers.D. To invest more in agriculture. CMedical drugs sometimes cause more damage than they cure. One solution to this problem is to put the drugs inside a capsule, protecting them from the bodyand the body from themuntil they can be released at just the right spot. There are lots of ways to trigger (引发) this release, including changing temperature, acidity, and so on. But triggers can come with their own risksburns, for example. Now, researchers in California have designed what could be a harmless trigger to date: shining near-infrared light (NIR, 近红外线) on the drug in the capsule.The idea of using light to liberate the drug in the capsule isnt new. Researchers around the globe have developed polymers (聚合物) and other materials that begin to break down when they absorb either ultraviolet (UV, 紫外线) or visible light. But tissues also readily absorb UV and visible light, which means the drug release, can be triggered only near the ski