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问题 单项选择题 A1/A2型题

某病人神经系统检查发现右下肢无力，肌力3级，右膝反射和跟腱反射亢进，右侧Babinski征（+），右下肢音叉觉和位置觉明显减退，左侧下肢肌力正常，左侧脐水平以下痛觉和温度觉丧失，病变部位在（）。

A.左侧延髓

B.右侧脊髓颈膨大

C.右侧脊髓腰膨大

D.右侧胸髓

E.右侧高颈段脊髓

答案

参考答案：D

单项选择题

根据下文回答问题：

在我国960万平方公里土地上，山地占2/3，大致可分为三级台阶。第一级台阶是世界第一大高原——青藏高原。第二级台阶从黑龙江最北端开 始，一直到云贵高原南部，平均海拔近2000米，包括内蒙古高原、黄土高原、秦岭、大巴山和云贵高原。自第二级台阶以东至东南沿海为华东平原，即第三级台 阶。上一级台阶都是下一级台阶的支撑或庇护伞。青藏高原是我国整个生态的屏障，它把寒冷空气挡在这座大墙之外，使它的东面和南面即第二级台阶形成了优良的 生态条件，温暖湿润，物种丰富。而第三级台阶属平原生态系统，现代城市生活基本上都集中在这里，第二级台阶丰富的物种资源为下一级台阶的平原生态系统提供 了生存的物资。三级台阶囊括了地球大多数生态类型，将地球自赤道至极地之间的多数陆地动植物承载其中，为人类的生存繁衍提供了物种资源。 三级台阶中最关键的是青藏高原， ★ 但目前的情况却不容乐观，由于全球气候变暖，连年干旱，青藏高原上的许多湖泊湿地渐渐干涸。青海湖是中国第一大咸水湖，现在每年退水13厘米，干涸的过程 中，矿物质析出，若干年之后，过高的矿化度会杀死湖内所有生物。近些年来过度放牧也导致了草场退化，进一步破坏了涵养水源的生态条件。一旦青藏高原上的高 寒草甸消失殆尽，整个高寒草甸将会被荒漠和沙漠所取代。青藏高原是地质灾害多发地，它就像一堆5-8公里厚的碎石镶在旋转的地球表面，顶端的线速度比平地 快很多，所以它的板块碰撞和地质灾害表现得更加突出。地震、塌方、雪崩、泥石流等比平原剧烈得多，常有半面山坡倾倒而下，山坡上的树木成片成片地随之被连 根拔起。由于气候变迁和人类无序开发，青藏高原植被覆盖率大大降低，风沙危害逐年增大。全球变暖，雪线退缩，使许多5000多米的雪山岩石裸露。冰融水量 减少，许多湿地与河流干涸，缺水的居民只能搬家。 云南省号称“植物王国”，但看到的绿色与之并不相符。云南省只有西南部的森林长势良好，而中东部大部分植被很稀疏，干热河谷和干荒地区生态 更加脆弱，水土流失相当严重，在喀斯特地形区的土层很薄，很容易被侵蚀。著名的云南石林，看上去虽然壮观，但从生态的角度去看，不过是一片石漠，在云贵许 多地点，正在形成大量新石漠区。红色土壤流失后，裸露出灰色的石灰岩，就像动物被剔去了皮肉，剩下肉架一样，比沙漠更难治理。在云南德宏地区的热带雨林， 人们砍掉它改种农作物，这样做是捡了芝麻，丢了西瓜。热带雨林是地球最重要而且无法替代的生态系统，农作物能够带来的经济效益与之相比不可同日而语。这里 的湿地、湖泊也在退缩或消失，以前碧波荡漾的纳帕海现在已消失不见。经询问才知道，是无序开发把地下水系破坏了，就像在我们的盆底钻一个孔，高原湖盆的水 全部漏掉了。

下列对原文意思的理解，准确的一项是（）

A．中国整个生态格局可以分为三级台阶，三级台阶之间相互依存

B．人为的无序开发，使青藏高原的雪线退缩，植被覆盖率大大降低

C．对生态系统的破坏，使得青藏高原板块碰撞和地质灾害表现得更加突出。

D．我国各地形成大量新石漠区及西南地区热带雨林遭到破坏，导致我国生态危机十分严重
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Bush’s MBA


Twenty-six of 42 presidents, including Bill Clinton, were lawyers. Seven were generals. George W. Bush becomes the first with an MBA.
Those who have had Bush for a boss since the mid-1980s—in the (1) of oil, baseball and Texas state government—describe his management (2) as straight from the pages of the organizational-behavior (3) he studied while getting his masters of business administration (4) at Harvard University in 1975.
He manages by what is known (5) "walking around," having learned that sitting behind a desk and passing out memos does (6) to energize anyone.
He has a reputation for fueling "creative tension" (7) his subordinates, encouraging them to take and defend opposing (8) . That sacrifices harmony, but puts ideas to the test and lets Bush (9) above the fray, where he can offer guidance instead of barking (10) . Imagine the creative tension that may erupt (11) the likes of Secretary of State-designate Colin Powell and Defense Secretary— (12) Donald Rumsfeld.
Above all, former employees say that he is a master at delegating (13) installing measures of accountability—ways of knowing (14) subordinates are getting the job done without looking (15) any shoulders. That frees Bush for strategic thinking—perhaps (16) two words hammered into MBA students most—which means thinking (17) to seize opportunities and to derail threats to the best of plans.
"George was my (18) ," says Tom Schieffer, who served as president of the Texas Rangers under Bush (19) 1991 and 1995. "But he never made me feel that way. He went out of his way to treat me as a (20) , not a subordinate."
That’s one trait that might be of concern, says Michael Useem, director of the Wharton Center for Leadership and Change at the University of Pennsylvania. It’s important for subordinates to feel part of the team, but not just because the boss craves popularity. Just as in the military, it must be understood who is in charge when the final order is given.
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