以下有关肾脏超声检查仪器的选择，错误的是（）。 A.相控阵探头 B.凸阵探头 C.线

阅读下面的文字，完成小题。

2010年，英国曼彻斯特大学物理学家安德烈·海姆和康斯坦丁·诺沃肖洛夫，两位最早发现并揭示石墨烯独特性质的科学家获得当年诺贝尔物理学奖。石墨烯从此进入大众视野，成为材料家族中光芒四射的新星。

石墨烯不是一种天然存在的材料。人们常见的石墨是由可以机械剥离的石墨片组成。由于石墨片层与层之间作用力较弱，当石墨被剥离至单层，仅有一个碳原子的厚度时，这层石墨片就是石墨烯。它是由碳原子紧密排列而成的蜂窝状结构的二维材料，看上去近似一张六边形网格构成的平面。

在材料大家族中，石墨烯只是个晚辈。2004年，海姆和诺沃肖洛夫领导的研究小组，将石墨片黏在两片特殊的胶带之间，撕开胶带，石墨片就被减薄，一分为二。，如此反复操作，薄片越来越薄，最终在显微镜下发现了石墨烯。人们发现，它的厚度只有o．34纳米，一片1毫米厚的石墨片由近300万层石墨烯堆垛而成。

石墨烯的发现及其独特性质刺激了全球研究者的神经，更有人将其称之为“改变21世纪的材料”。

石墨烯具有完美的二维平面结构，它蕴含的丰富而新奇物理现象的奥秘就来源于此。石墨烯拥有完美的对称正六边形结构，非常稳定，而且各个碳原子之间的连接很柔韧，即使受到外力冲击，也可以通过弯曲变形来维持稳定。       

这一独特结构使石墨烯几乎集合了世界上众多材料的最优质品质。据测试，它是迄今为止自然界中最强的二维材料，强度通常为普通钢材料的数十倍。有人曾测算，一块1平方米的石墨烯吊床足以承受一只4公斤重的猫，而该吊床的重量仅为0．77毫克，比猫的腮须还轻，肉眼根本看不到。

最让科学界瞩目的，是它超强的导电性能。中国科学院半导体研究所研究员介绍，石墨烯具有独特的线性电子能带结构，其传导电子是无质量的狄拉克费米子。电子在石墨烯中运动几乎没有阻力，迁移速度极快，是世上已知的电阻率最小的材料，因为这一特点，石墨烯被期待可用来发展更薄、导电速度更快的新一代电子元件或晶体管。

石墨烯还有优异的室温导热性和透光性。它的导热性能优于碳纳米管和金刚石，且几乎完全透明，只吸收2．3%的光。透明、良好的导电特性，使它极适合制造透明触控屏幕、光板、甚至是太阳能电池。

石墨烯“出道”虽短，但它所具有的      、      、      和      等超强性能，使产业界迅速嗅到了其在电子、航天军工、生物、新能源、半导体等领域可能的应用潜力。但研究者对其产业化仍持谨慎态度，有关石墨烯的众多应用研究目前多数还处于实验室阶段，它的神奇性能能否完全在应用上显现，还需科学家进一步分析和测试。

（摘自2013年7月19日《人民日报》）

小题1:下列关于“石墨烯”的表述，不恰当的一项是

A．石墨烯是由碳原子紧密排列而成的蜂窝状结构的二维平面材料。

B．石墨烯的厚度只有0． 34纳米，具有完美的对称正六边形结构。

C．石墨烯作为一种天然存在的材料被发现后，有人称之为“改变21世纪的材料”。

D．石墨烯可以利用石墨片层与层之间作用力较弱的特点通过机械剥离获得。小题2:下列表述符合文意的一项是

A．石墨烯结构稳定，各个碳原子之间连接柔韧，即使受外力冲击也不会遭到破坏。

B．据测算，一块1平方米、仅重0．77毫克石墨烯吊床可以承受4公斤重的物品。

C．石墨烯具有独特的线性电子能带结构，相比狄拉克费米子而言，其电阻率更小。

D．石墨烯的特性使之适合制造透明触控屏幕等，不久的将来将取代金刚石等材料。小题3:根据文意，在文章最后一段中画横线处填入恰当的词语。（4分）

        、      、       和         

下述社会关系中属行政法调整范围的是( )。

A．各社会组织内部的管理关系

B．行政机关缔结买卖合同而形成的关系

C．法律法规授权的组织行使某一行政管理权所发生的社会关系

D．行政机关与相对方当事人之间发生的民事关系

Growing up on a tobacco farm, Emma Avery was used to hard times. When she was seven, her family’s farmhouse burned to the ground. Her father made a temporary (临时的) shelter, where eight people had to sleep in two beds. As soon as Emma and her four brothers and two sisters were big enough, they were out in the fields.

Emma would find her comfort in school, even as a C student, thanks to one teacher. When she moved on to middle school, Emma was alarmingly far behind her classmates. She kept her head down, trying not to be noticed, struggling to catch up, and feeling like an outsider.

Then one day, when Emma was 16, a teacher named Mr. Potts changed everything. Looking his students in the eye, Mr. Potts said, "Being a C student does not mean you do not have a valuable contribution to make. Some of you have to work in the fields in the evening and do not have time to study. But if you do your best, you have a gift to give."

The teacher’s words made Emma believe she could do well, and she worked harder. In the end she won a scholarship to St. Paul’s College, graduated with a degree in elementary education in 1967, and got a job in the public-school system. Then, at George Washington University, she received a master’s in education in 1970, and afterwards in the same year she married Ron Smothers.

Over the next six years, Emma taught in public schools in Miami. In 1976, after saving $10,000, she opened her first restaurant in Los Angeles. Eventually Emma stopped teaching, and her business expanded (扩展) to six restaurants.

In gratitude (感激) for what she has been able to achieve, Emma donates a lot. She has no idea how much money she’s given away. She says, "Those I want to help are the C students who just need help, direction and confidence."

小题1:The first paragraph serves to show that Emma ______.

A．was poor and had no time to study

B．was born on a tobacco farm

C．was sad to lose her house

D．was kind enough to help support the family小题2:From the text we learn that Emma ______.

A．won a scholarship to George Washington University

B．was unsuccessful as a businesswoman

C．was thankful to Mr. Potts

D．disliked teaching, and gave up the job小题3:From the second paragraph we can infer that Emma was ______.

A．unintelligent

B．unconfident

C．hard-working

D．Considerate小题4:The text mainly wants to tell us ______.

A．confidence is the first step to success

B．memory of the past is the teacher of the future

C．something attempted, something done

D．nothing is impossible to a willing heart

某公司收入与支出状况

该公司收入小于支出的共有几个月（）。

A．1个月

B．2个月

C．3个月

D．4个月

因发表《扬子江形势论略》被誉为“皖城名士”的是______

A．赵朴初

B．胡适

C．陈独秀

D．陶行知