问题 单项选择题 案例分析题

患者男,79岁。因"左侧肢体乏力伴言语不清1小时"入院,1小时前患者平静坐着休息时,突觉左手乏力,不能握紧手中杯子,步态不稳,向左侧偏斜,伴口齿不清,无头痛、恶心呕吐,无意识不清,无四肢抽搐,无发热。既往有高血压史十余年,最高时达180/120mmHg,平日血压控制不详,否认有糖尿病史,否认冠心病房颤史。体格检查:BP160/90mmHg,神清,言语欠清,对答切题,双眼球活动度好,眼震(-),左侧视野缺损,左侧鼻唇沟略浅,伸舌左偏,颈软,左侧上肢近端肌力Ⅳ级,远端肌力Ⅲ级,左下肢近端肌力Ⅳ级,远端Ⅳ级,右侧肢体肌力Ⅴ级,双侧肢体肌张力等对,左侧偏身感觉减退,左侧巴氏症(+)。辅助检查:头颅CT示:颅内未见明显异常;血常规、生化、凝血功能未见明显异常。

该病的瘫痪为()。

A.上运动神经元瘫痪

B.下运动神经元瘫痪

C.神经肌肉接头瘫痪

D.肌源性瘫痪

E.以上都不是

答案

参考答案:A

单项选择题

Jan Hendrik Schon’s success seemed too good to be true, and it was. In only four years as a physicist at Bell Laboratories, Schon, 32, had co-authored 90 scientific papers—one every 16 days—detailing new discoveries in superconductivity, lasers, nanotechnology and quantum physics. This output astonished his colleagues, and made them suspicious. When one co-worker noticed that the same table of data appeared in two separate papers—which also happened to appear in the two most prestigious scientific journals in the world, Science and Nature—the jig was up. In October 2002, a Bell Labs investigation found that Schon had falsified and fabricated data. His career as a scientist was finished. Scientific scandals, which are as old as science itself, tend to follow similar patterns of presumption and due reward.

In recent years, of course, the pressure on scientists to publish in the top journals has increased, making the journals much more crucial to career success. The questions are whether Nature and Science have become too powerful as arbiters of what science reaches to the public, and whether the journals are up to their task as gatekeepers.

Each scientific specialty has its own set of journals. Physicists have Physical Review Letters, neuroscientists have Neuron, and so forth. Science and Nature, though, are the only two major journals that cover the gamut of scientific disciplines, from meteorology and zoology to quantum physics and chemistry. As a result, journalists look to them each week for the cream of the crop of new science papers. And scientists look to the journals in part to reach journalists. Why do they care Competition for grants has gotten so fierce that scientists have sought popular renown to gain an edge over their rivals. Publication in specialized journals will win the acclaims from academics and satisfy the publish-or-perish imperative, but Science and Nature come with the added bonus of potentially getting your paper written up in The New York Times and other publications.

Scientists tend to pay more attention to the big two than to other journals. When more scientists know about a particular paper, they’re more apt to cite it in their own papers. Being oft-cited will increase a scientist’s "Impact Factor", a measure of how often papers are cited by peers. Funding agencies use the "Impact Factor" as a rough measure of the influence of scientists they’re considering supporting.

According to the passage, what makes Science and Nature powerful().

A. They cover the best researches on a variety of subjects.

B. They publish controversial papers that others won’t.

C. They prefer papers on highly specialized research.

D. They have a special system of peer-review.

单项选择题