A Survey of Listening——Obstacles in College English Teaching

Listening is an essential component of communication in human life. It's also a basic skill in English learning. But for most college students, among listening, speaking, reading and writing skills, listening is the most difficult one. This paper was designed to survey the English listening obstacles in college and focuses on the categories of the listening obstacles in English teaching in college. From the paper, the readers can have a general idea about English listening obstacles and get some useful advices from the participants.     

Specialist and generalist species in habitat use: implications for conservation assessment in snakes

Habitat specialization is recorded as one of the central factors that make species vulnerable to extinction. Among snakes, there is considerable variation in this trait, as some species are specialists and others are generalists in habitat use. We have quantified habitat specialization in the snakes of the southern Iberian Peninsula, and compared it with their abundance and IUCN categories. All data were combined for a principal components analysis that discriminated two main groups: three generalist species that live in all types of habitat, and five specialist species that ranged from rather scarce to extremely rare and are found only in unaltered habitats. The three generalist snakes are not threatened and their IUCN category is Least Concern. Three out of the five specialist species are categorized as Near Threatened, Vulnerable, and Endangered at regional or national levels. The other two species are currently considered Not Threatened and we discuss whether they are incorrectly classified. The conservation status of snakes is difficult to evaluate because of their secretive habits and low population densities. We suggest that quantifying habitat specialization may be a useful tool for assessing the conservation status of secretive organisms such as snakes.     

《科图法》中医药类目下的中医现代研究子类(62.03)探索

结合实际工作,就《科图法》第3版医卫类中的中医、中药类目下的中医现代研究子类进行品评、疏理、发掘,以期更好地利用类目资源服务于标引工作。     

范畴的中心

本文讨论了范畴中心的一些性质，主要结果是：等价范畴的中心是一一对应的     

解析社会隐性歧视残疾人问题

社会歧视残疾人现象普遍存在，与建立和谐社会的要求极不吻合。社会歧视残疾人的表现在教育、就业、婚姻和社会保障等方面，歧视的原因主要有历史和现实等因素。本文基于歧视理论，依据民政部的统计数据，通过对江西省遂川县的实地调查数据，来揭示当前的残疾人隐性歧视问题。在社会主义和谐社会建设的时期，消除歧视，共享改革成果，是时代的要求和社会进步的标志。     

汉语表现风格概论

语言表现风格是综合运用各种风格手段所形成的气氛和格调，是对一切言语交际的产物──话语的气氛和格调从多角度多侧面的抽象概括。表现风格有多组相互对立的类型，是处于最高层位的共性风格，它既可以用来概括语体风格、民族风格、对比风格、地域风格、流派风格和个人风格，而又存在于这各种风格的话语之中，任何话语都附着这样或那样的表现风格。表现风格的成因既有制导因素，也有物质因素。各种表现风格的生成都是有规律的。     

娄烦县植被类型及其利用保护对策研究

简要介绍了娄烦县的自然生态环境、分布区类型、生活型组成及主要群落类型，提出了植被生态保护利用对策。     

中间物质和弱topos的定义

在已知范畴Ｆｕｚ，范畴ＦＲ（Ｙ），ＦｕｚＦｕｚ有“中间物质和弱ＳＣ”的基础上，利用偏序集和态射之间的偏序关系在一个抽象的范畴中给出中间物质的定义，将具有中间物质的Ｃａｒｔｅｓｉａｎ Ｃｌｏｓｅｄ范畴称为一个弱ｔｏｐｏｓ，并证明了范畴Ｆｕｚ，范畴ＦＲ（Ｙ）和范畴ＦｕｚＦｕｚ都是弱ｔｏｐｏｓ，在而在Ｃａｒｔｅｓｉａｎ Ｃｌｏｓｅｄ范畴与ｔｏｐｏｓ之间又引入了一种结构。     

对合Quantale的表示定理

引入了关系对合Quantale的定义，得到了对合Quantale的表示定理，并且在范畴意义下，讨论了对合Quantale范畴与其满子范畴等价．     

群自同构全提升本盖结构

根据Ｆｒｙ的群与Ｇｒｕｅｎｂｅｒｇ的扩张范畴（Ｔｒ