单选题Even plants can run a fever, especially when they are under attack by insects or disease. But (1) humans, plants can have their temperature (2) from 3,000 feet away—straight up. A decade ago, (3) the infrared scanning technology developed for military purpose and other satellites, physicist Stephen Paley (4) a quick way to take the temperature of crops to determine (5) ones are under stress. The goal was to let farmer (6) target pesticide spraying (7) rain poison on a whole field, which (8) include plants that don't have the pest problem. Even better, Paley's Remote Scanning Services Company could detect crop problem before they became (9) to the eye. Mounted on a plane flown at 3,000 feet (10) , an infrared scanner measured the heat emitted by crops. The data were (11) into a color-coded map showing (12) plants were running "fevers". Farmers could then spot spray, using 50 to 70 percent less pesticide than they (13) would. The bad news is that Paley's company closed down in 1984, after only three years. Farmers (14) the new technology and long-term backers were hard (15) . But with the renewed concern about pesticides on produce, and refinements in infrared scanning, Paley hopes to (16) into operation. Agriculture experts have no doubt about the technology works. "This technique can be used (17) 75 percent of agricultural land in the United States," says George Oerther of Texas A＆M. Ray Jackson, who recently retired from the Department of Agriculture, thinks (18) infrared crop scanning could be adopted by the end of the decade. But (19) Paley finds the financial backing (20) he failed to obtain 10 years ago.

单选题AustinFlint杂音和二尖瓣狭窄舒张期杂音的主要辨别点在于

单选题Galloway, a mostly middle-class community northwest of Atlantic City, is part of a wave of districts across the nation trying to remake homework amid concerns that high-stakes testing and competition for college have fueled a nightly grind that is stressing out children and depriving them of play and rest, yet doing little to raise achievement, particularly in elementary grades. Such efforts have drawn criticism from some teachers and some parents who counter that students must study more, not less, if they are to succeed. Even so, the anti-homework movement has been reignited in recent months by the documentary Race to Nowhere, about burned-out students caught in a pressure-cooker educational system. "There is simply no proof that most homework as we know it improves school performance," said Vicki Abeles, the filmmaker and a mother of three from California. "And by expecting kids to work a 'second shift' in what should be their downtime, the presence of schoolwork at home is negatively affecting the health of our young people and the quality of family time. " So teachers at Mango Elementary School in Fontana, Calif., are replacing homework with "goal work" that is specific to individual student's needs and that can be completed in class or at home at his or her own pace. The Brooklyn School of Inquiry, a gifted and talented program, has made homework optional. "I think people confuse homework with rigor," said Donna Taylor, the Brooklyn School's principal, who views homework for children under 11 as primarily benefiting parents by helping them feel connected to the classroom. Research has long suggested that homework in small doses can reinforce basic skills and help young children develop study habits, but that there are diminishing returns. Still, efforts to roll back homework have been opposed by those who counter that there is not enough time in the school day to cover required topics and that homework reinforces classroom learning. In Coronado, Calif. , the school board rejected a proposal by the superintendent to eliminate homework on weekends and holidays after some parents said that was when they had time to help their children and others worried it would result in more homework on weeknights. Homework wars have divided communities for over a century. In the 1950s, the Sputnik launching ushered in heavier workloads for American students in the race to keep up with the Soviet Union. The 1983 report "A Nation at Risk" and, more recently, the testing pressures of the No Child Left Behind law, also resulted in more homework for children at younger ages. A few public and private schools have renounced homework in recent years, but most have sought a middle ground. In Galloway, the policy would stipulate that homework cover only topics already addressed in class. Dr. Giaquinto, Galloway's superintendent, said the goal of the proposed policy was to make homework "meaningful and manageable," noting that teachers would have to coordinate assignments so that a student's total homework would not exceed the time limit.

单选题女，45岁，查外周血Hb90g／L，RBC2．85×10 12 ／L。外周血涂片靶形红细胞占26％，本例诊断为

单选题 VITEK微生物自动鉴定及药敏分析系统是（ ） A、采用光电比色法，测定微生物分解底物导致pH值改变而产生的不同颜色，来判断反应的结果 B、采用传统呈色反应法，同时采用敏感度极高的快速荧光测定技术来检测细菌胞外酶 C、采用荧光增强技术与传统酶、底物生化呈色反应相结合 D、底物中加入酶基质，不同的细菌作用于不同的底物，激发出不同强度的荧光 E、利用微生物对不同碳源代谢率的差异

单选题与Babinski征意义相同的病理征是

单选题 关于脑脊液检验的正常参考值，下列哪项是错误的？ A、蛋白定量成人 0．15～0．45g／L B、蛋白电泳α1-球蛋白为 3％～8％ C、IgG0．01～0．04g／L D、氯化物定量 119～12gmmol／L E、乳酸脱氢酶总活性0～5mIU／L

单选题 出院记录内容不包括： A、入院日期 B、住院经过 C、出院诊断 D、病历摘要 E、出院日期

单选题胃镜检查时，患者体位

单选题下列情况下出现胸式呼吸减弱的是

单选题不属于胃镜检查的适应证是

单选题 管样呼吸音可见于下列疾病，但除外 A、肺癌 B、大叶肺炎 C、肺脓肿 D、肺结核 E、胸腔积液时积液区上方

单选题 下列哪种不属于正常细胞性贫血 A、再生障碍性贫血 B、急性失血性贫血 C、溶血性贫血 D、海洋性贫血 E、白血病所致贫血

单选题双侧上眼睑下垂见于

单选题 血清钾减低哪项外均是正确的? A、血钾摄入不足 B、代谢性碱中毒 C、大量出汗 D、急性酸中毒 E、大量应用胰岛素

单选题 关于红细胞大小可见下列异常，但不包括 A、小RBC B、大RBC C、椭圆形细胞 D、巨RBC E、RBC大小不均

单选题进行纤维支气管镜检查时，进镜应

单选题水肿这一症状的概念不包括

单选题Charles Darwin wed his cousin Emma and spawned 10 children, including four brilliant scientists. Albert Einstein’s second wife Elsa was his first cousin. Queen Victoria said “I do” to hers. So have millions worldwide. In parts of Saudi Arabia, 39% of all marriages are between first cousins. In the U. S., though, the practice bears a stigma of inbreeding just this side of incest. The taboo is not only social hut legislative; 24 states ban the marriage of first cousins: five others allow it only if the couple is unable to bear children. A major reason for this ban is the belief that kids of first cousins are tragically susceptible to serious congenital illnesses. That view may have to change. A comprehensive study published recently in the Journal of Genetic Counseling indicates such children run an only slightly higher risk of significant genetic disorders like congenital heart defects — about two percentage points above the average 3% to 4%. Says the study’s lead author, Robin Bennett, president-elect of the National Society of Genetic Counselors, which funded the study: “Aside from a thorough medical family history, there is no need to offer any genetic testing on the basis of consanguinity alone”. Publication of the study will do more than tweak public awareness; it will enlighten doctors who have urged cousin couples not to have children. “Just this week,” says Bennett, “I saw a 23-year-old woman who had had a tubal ligation because her parents were cousins and her doctor told her she shouldn’t have children.” The American proscription against cousin marriages grew in the 19th century as wilderness settlers tried to distinguish themselves from the “savage” Indians, says Martin, author of the book Forbidden Relatives: The American Myth of Cousin Marriage. “The truth is that Europeans were marrying their cousins and Native Americans were not.” And doesn’t God have stern words on the subject? Christie Smith, 37, a Nevada writer, says she felt guilty when she fell in love with her first cousin’s son Mark. “I was trying so hard to convince myself not to have these feelings,” she recalls, “that I went to the Bible looking for confirmation that it was wrong. And what I found was the exact opposite: support for cousin marriages.” The patriarch Jacob married two of his first cousins, Rachel and Leah. Smith married Mark in 1999. The medical ban is lifted; the social stain may take longer to disappear.

单选题 错误的二维超声常用检查窗是( )。 A、顶窗 B、颞窗 C、枕窗 D、眼窗 E、额窗