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专家解题:2012年职称英语考试理工类A级概括大意与完成句子真题及答案解析2

来源:博大考神职称考试网 发布时间:2014-08-29
  考题类型:概括大意与完成句子
  
Learn about Noble Gases(惰性气体)1    Have you ever ridden on aballoon? Many tourist spots offer balloon rides in order for people to see thebeauty of a place from above. A balloon contains a noble gas called helium(氦). Formerly, balloons containedhydrogen but hydrogen is very flammable and dangerous when uncontrolled.Therefore, people shifted to helium, which is safer. Helium is safe because ithas the properties of the noble gases.2    People once believed thatnoble gases couldn’t chemically react at all. For this reason, they were called inertgases(惰性气体). Theywere also listed under Group 0 inthe old periodic table because scientists believed that the gases have zerovalence(价) electronsin their outer shell. This was later proven to be untrue when some noble gascompounds were discovered.3   The gases are elements,which share similar properties. These properties include being monoatomic,colorless, odorless, being able to conduct electricity, and having low chemicalreactivity. Noble gases include Helium, Neon, Argon, Krypton, Xenon and Radon.These are all found in Group 18, in the rightmost column of the periodic table.If you look at the periodic table, you will notice that these elements are theonly ones, which do not have a charge. Helium has the lowest molecular(分子的) weight while Radon is theheaviest.4   Remember that chemicalreactions occur because atoms have valence electrons, which are electrons intheir outer shell. When the outer shell is “unfilled” or the required number ofelectrons is not yet complete, the atom is more reactive. Noble gases have afull outer shell, meaning that they have complete electrons in their outershell. This complete number varies. For instance, the outer shell of Helium has2 valence electrons while the outer shell of Xenon has 8 electrons. Nowadays,there remains to be a few noble gases because of the low chemical reactivity ofthese said gases.5    Because of theirproperties, noble gases have many important applications. They are widely usedin medicine and industries. For instance, Liquid Helium is used forsuperconducting magnets(磁体). These magnets are very important in physics and medicine. When adoctor suspects that a person’s brain has been damaged, he might request forMagnetic Resonance Imaging (MRI). MRI allows the doctor to “see” the brain,without operating on the patient.-27. Noble gases are not very chemically______.A. unnecessary   B. complete  C. lightest   D. important    E. flammable   F. reactive  专家解题: 第一步:首先看有没有可以帮助我们解题的语法结构。本题目要选择的是一个能被副词chemically修饰的词,也就是动词或形容词。所有选项都符合条件。所以使用查读法进行解题。确定题干中的信息词为:chemically。第二步:利用信息词,我们直接回归原文的第二段第一句:Peopleonce believed that noble gases couldn’t chemically react at all.第三步:对比题干和原文。原文中chemically修饰的是动词react,而选项中出现了该单词的形容词形式reactive,所以,本题的答案应该是选项F。该题主要的解题思路就是通过信息词回归以后,找到原文和题干内容的同义改写。28. Among the elements of noble gases Helium is the____.A. unnecessary   B. complete  C. lightest   D. important    E. flammable   F. reactive  专家解题: 第一步:首先看有没有可以帮助我们解题的语法结构。本题目要选择的是一个能被定冠词the修饰的名词或最高级。选项中满足这个要求的只有选项C的lightest。The+形容词最高级表达形式。所以,本题的答案是选项C。该题主要的解题思路就是通过冠词the的用法来进行排查和确定答案的。29. The required number of electrons in noble gases’ outer shell is_____.A. unnecessary   B. complete  C. lightest   D. important    E. flammable   F. reactive  专家解题: 第一步:首先判断出没有可以帮助我们解题的语法结构。所以使用查读法进行解题。确定题干中的信息词为:The required number of electron,outer shell。第二步:利用信息词,我们直接回归原文的第四段前半部分:Rememberthat chemical reactions occur because atoms have “valence” electrons, which are electrons in their outer shell. When the outershell is “unfilled” or the required number ofelectrons is not yet complete, the atom is more reactive.第三步:对比题干和原文。选项B的complete出现在原文中,所以,本题的答案应该是选项B。30. MRI may make operating on the patient ______.A. unnecessary   B. complete  C. lightest   D. important    E. flammable   F. reactive  专家解题:
第一步:首先判断出有没有可以帮助我们解题的语法结构。题干中涉及到单词make的用法,即:使某人/某事怎么样,这里是:使得病人身上的手术____。不能根据这个判断出答案,所以快速确定题干的信息词为:MRI,operating on the patient。第二步:利用信息词,我们直接回归原文的最后一段后半部分:When adoctor suspects that a person’s brain has been damaged, he might request for Magnetic ResonanceImaging (MRI). MRI allows the doctor to “see” the brain,without operating on the patient.第三步:对比题干和原文。原文中说的是without operatingon the patient,也就是不用在病人身上做手术,选项中,A选项的unnecessary是没用的意思,也就是:使得病人身上的手术没用,符合原文的意思,所以,本题的答案应该是选项A。  为帮助考生用最轻松的方式通过职称英语考试,考职称网官方推荐:博大考神职称英语家庭式培训班,它是在家里上的面授班,通过打造轻松愉快的学习过程,帮助考生掌握职称英语的考试技巧,提供贴心的班主任全程督导服务帮助考生坚持学完所有课程,只要学习达标,即可通过考试,不过退款!(职称英语零基础通关QQ交流群:347526614)2015年如何轻松通过职称英语考试?】  <<<<<职称英语vip保过,不过退款!<>  <<<<<职称英语零基础也不怕?这里保过!<>  <<<<<什么是职称英语?有什么通过秘诀吗?<>  <<<<<职称英语教父幺建华揭秘过关技巧<>   <<<<<在家也可以上职称英语面授班!<>    <<<<<不用背单词也能通过职称英语!<>
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