[创造更适合我们班级孩子的“学讲”英语课]李涛涛 ]，自从徐州市推进 学讲计划 以来，一直在努力探索 学讲 之路，在这个过程中，经历了很多困难和挫折，但也意外收获了许多。学讲 课堂重视的是学生自己真实的学习的发生，所以学...+阅读
[物理学]
题目序号
题型归类
第1题
中心主旨题型
第2题
审题定位题型
第3题
细节推导题型
第4题
细节推导题型
第5题
引申推导题型
The intensive work of materials scientists and solid-state physicists has given rise to a class of solids known as amorphous metallic alloys or glassy metals. There is a growing interest among theoretical and applied researchers alike in the structural properties of these materials.
When a molten metal or metallic alloy is cooled to a solid, a crystalline structure is formed that depends on the particular alloy position. In contrast, molten nonmetallic glass-forming materials when cooled do not assume a crystalline structure, but instead retain a structure somewhat like that of the liquid — an amorphous structure. At room temperature the natural long-term tendency for both types of materials is to assume the crystalline structure. The difference between the two is in the kiics or rate of formation of the crystalline structure which is controlled by factors such as the nature of the chemical bonding and the ease with which atoms move relative to each other. Thus, in metals, the kiics fors rapid formation of a crystallines structure whereas in nonmetallic glasses the rate of formation is so slow that almost any cooling rate is sufficient to result in an amorphous structure. For glassy metals to be formed, the molten metal must be cooled extremely rapidly so that crystallization is suppressed.
The structure of glassy metals is thought to be similar to that of liquid metals. One of the first attempts to model the structure of a liquid was that by the late J. D. Bernal of the University of London, who packed hard spheres into a rubber vessel in such a way as to obtain the maximum possible density. The resulting dense, random-packed structure was the basis for many attempts to model the structure of glassy metals.
Calculations of the density of alloys based on Bernal-type models of the alloys metal ponent agree fairly well with the experimentally determined values from measurements on alloys consisting of a noble metal together with a metalloid such as alloys of palladium and silicon or alloys consisting of iron phosphors, and carbon, although small discrepancies remained. One difference between real alloys and the hard spheres area in Bernal models is that the ponents of an alloy he different size, so that models based on two sizes of spheres are more appropriate for a binary alloy for example. The smaller metalloid atoms of the alloys might fit into holes in the dense random-packed structure of the larger metal atoms.
One of the most promising properties of glassy metals is their high strength bined with high malleability. In usual materials, one finds an inverse relation between the two properties, whereas for many practical applications simultaneous presence of both properties is desirable. One residual obstacle to practical applications that is likely to be overe is the fact that glassy metals will crystallize at relatively low temperatures when heated slightly.
1.The author is primarily concerned with discussing
[A] crystalline solids and their behior at different temperatures.
[B] molten materials and the kiics of the formation of their crystalline structure.
[C] glassy metals and their structural characteristics.
[D] metallic alloys and problems in determining their density.
2.The author’s attitude toward the prospects for the economic utilization of glassy metals is one of
[A] disinterest.
[B] impatience.
[C] optimism.
[D] apprehension.
3.According to the text, which of the following determines the crystalline structure of a metallic alloy?
[A] At what rate the molten alloy is cooled.
[B] How rapid the rate of formation of the crystalline phase is.
[C] How the different-sized atoms fit into a dense random-packed structure.
[D] What the alloy consists of and in what ratios.
4.Which of the following best describes the relationship between the structure of liquid metals and the structure of glassy metals, as it is presented in the text?
[A] The latter is an illustrative example of the former.
[B] The latter is a large-scale version of the former.
[C] The former is a structural elaboration of the latter.
[D] The former is a fair approximation of the latter.
5.It can be inferred from the text that, theoretically, molten nonmetallic glasses assume a crystalline structure rather than an amorphous structure only if they are cooled
[A] very evenly, regardless of the rate.
[B] rapidly, followed by gentle heating.
[C] very slowly.
[D] to room temperature.
[答案与考点解析]
1.【答案】C
【考点解析】本题是一道中心主旨题。本文的中心主旨句是首段的第二句，该句中的“these materials”指的就是首段第一句中的“amorphous metallic alloys or glassy metals”。可见本题的正确答案应该是C。考生一定要知道：破解中心主旨题的关键在于抓住全文的中心主旨句。
2.【答案】C
【考点解析】本题是一道审题定位题。根据题干中的“prospects”(前景)可将本题的答案信息迅速确定在尾段，因为尾段首句中的“promising”（有前途的）暗示本段讲某种事物的前景或未来。本题的确切答案信息来源在尾段的最后一句，该句中的“that is likely to be overe”暗示本题的正确答案是C。考生在解题时一定要具备迅速地审题定位能力，还要具备理解原文深层含义的能力。
3.【答案】D
【考点解析】这是一道细节推导题。根据题干中的“crystalline structure”可将本题的答案迅速确定在第二段的首句，该句中的“depends on”和题干中的“determines”相互呼应。通过仔细理解第二段的首句可推导出本题的正确选项是D。请考生注意原文中“position”和选项中“consists of”的转换。考生在解题时一定要具备细节推导能力，不能只停留于文字的表面含义。
4.【答案】D
【考点解析】这是一道细节推导题。根据题干中的“the structure of liquid metals and the structure of glassy metals”可将本题的答案信息来源迅速确定在第三段的首句。该句中的“similar”一词暗示选项D是正确答案。考生在解题时应重视对立对比关系。
5.【答案】C
【考点解析】本题是一道总结归纳信息并进行引申推导题型。从本题题干中的“molten nonmetallic glasses”可断定本题的答案信息在本文第二段，因为该句中包含有题干中的核心词语“molten nonmetallic glasses”。我们需要归纳和总结本段的每一句话，尤其是第
三、四句的内容，另外本段尾句的含义为推导（infer）出本题的正确选项C起到至关重要的作用。考生在破解此类题型时一定要注意首先归纳和总结原文中相应出题点的全面信息，更要注意逻辑推导的能力。
[参考译文]
材料科学家和固体物理学家的深入研究已促进了一种固体物质的出现，这类固体被称为非晶体金属合金，也就是玻璃金属。理论和应用研究者对这些材料的结构特性的兴趣正与日俱增。
当一种熔化的金属和金属合金冷却成固体时，依赖于特定的合金成份将形成各种晶体结构。相比之下，熔化的非金属、玻璃类材料在冷却后将不会形成晶体结构，而是保留一点类似于液体的非晶体结构，在室温条件下，两类材料的自然的长期倾向都形成了晶体结构。它们之间的不同在于动态性，即形成晶体结构的速度。这种动态性受下述两种因素控制：化学结合的性质和分子之间相互运动的自由程度。由此，对金属而言，动态历程有利于晶体结构的快速形成；而对非金属来说，这种形成速度非常慢，以至于任何自然冷却速度都足以形成一种非晶体结构。要想形成玻璃金属，熔化的金属必须以极快的速度冷却，以抑制晶体的形成。
人们认为玻璃金属的结构与液态金属的结构类似。创建这种液体结构模型的第一次尝试是已故的伦敦大学的J. D.鲍纳尔进行的，他将坚硬的球体尽可能多地填塞进一个橡胶容器中，以便得到一种可能的密度。这个密度结果以及随机填塞结构以后便成为试图建立玻璃金属结构模型的基础。
基于鲍纳尔模型，由合成金属的成份组成对合金密度的计算结果与实验测得的结果相当地吻合，当然一些细微的差异仍然存在。实验结果是通过测量由一种重金属和类金属组成的合金得到的，如钯和硅的合金，或铁磷和碳组成的合金。实际的合金和鲍纳尔模型所用的球体之间的差别在于合金的成份有不同的体积大小，因此，基于两种大小的球体的模型更适合于两类物质的合金。合金中非金属的小原子可能填进由大原子随机填塞形成的紧密结构中。
玻璃金属最有前景的一个特征是高强度与高延伸性的结合。在常见的晶体材料中，这两种特性一般是成反比的，但人们渴望它们同时存在。在实际用途中可能还有一个问题急待解决，即当玻璃金属在相对的低温下慢慢加热时，它会逐渐变为晶体结构。
以下为关联文档：
高三英语教研组工作计划5篇高三英语教研组工作计划5篇(一)一、指导思想以学校总体教学工作为依据，以提高教研质量和教学质量为目标，增强教师的学习意识、服务意识、教科研意识、质量意识、合作意识、...
2016年关于国庆节英语演讲稿带翻译2016年关于国庆节英语演讲稿带翻译篇1Dear teacher, dear students:Everybody is good! The title of my speech today is: the national flag fluttering.Inadvertently...
攀登英语学习实验学期进展汇报开学近两个月来，我校攀登英语的教学工作按照市、区及本校的教学工作计划进行。从本周开始，进行Unit 6的教学，现将这段时间来的工作汇报如下：一、实验基本信息列项主要内容具...
家长会英语老师发言稿五篇【家长会英语老师发言稿】范文一尊敬的各位家长：晚上好!今天，我很荣幸地在这里，作为你们孩子的英语老师，和你们共同探讨一下怎样帮助孩子学好英语，由于水平有限，不当之处，敬请批...
读《英语广场》有感作者：王姣姣 ] 偶然的一次机会看到了《英语广场》这本杂志，翻来看看里面的内容还是很不错的，于是到网上查阅的一些有关这本杂志的信息，它是一本创刊十几年的杂志英汉对照、难度...
儿童学习英语是越早越好吗语言是孩子思维的窗口，代表了孩子心理发育的水平，家长都非常关注孩子语言能力的发展，加上如今对外交往的日益增加，大家更加关注孩子英语的学习，例如，双语幼儿园、剑桥英语学校、阶...
尽量多的运用英语来提问学生，为学生创造一种良好的学这个星期主要是期中调研，这也是很好地检验自己教学的一种方法，我也在这次的调研中发现了的一些问题。首先，听力部分还有待加强。从这次的***中，可以看出学生在第二题，根据问句选...
我爱英语,我爱Courage我爱英语,我爱Courage! 济南市经五路幼儿园与外教课堂互动 今天早上，大一班的孩子们显得比往常活跃兴奋了许多，原来，他们的老朋友Courage要来到班里了!孩子们都焦急的等待着，热...
在生活中积累英语新的一个学期过了近一个月，小朋友渐渐适应了幼儿园有规律的学习生活。和第一个学期相比，他们更爱玩了，学习的欲望和能力也越来越强了。要说小朋友的学习和以前有什么不同，最大的...
