职称英语考试辅导综合类A级阅读(一)

1、2019职称英语考试辅导综合类a级阅读（一）2017年职称英语考试辅导综合类a级阅读（一）a memory drug?its difficult to imagine many things that people would welcome more than a memory-enhancing drug. 1 furthermore, such a drug could help people remember past experiences more clearly and help us acquire new information more easily for school

2、and at work. as scientists learn more about memory, we are closing in on this tantalizing goal.1some of the most exciting evidence comes from research that has built on earlier findings linking ltp2 and memory to identify a gene that improves memory in mice. 2 mice bred to have extra copies of this

3、gene showed more activity in their nmda receptors, more ltp, and improved performanceon several different memory tasks learning a spatial layouts, recognizing familiar objects, and recalling a fearinducing shock.if these basic insights about genes, ltp, and the synaptic basis of memory can be transl

4、ated to people - and that remains to be seen 一 they could pave the way for memory-enhancing treatments. 3 as exciting as this may sound, it also raises troubling issues. consider the potential educational implications of memory-enhancing drugs. if memory enhancers were available, children who used t

5、hem might be able to acquire and retain extraordinary amounts of information, allowing them to progress far more rapidly in school than they could otherwise. how well could the brain handle such an onslaught of information? what happens tochildren who don rt have access to the latest memory enhancer

6、s? are they left behind in school and as a resulthandicapped later in life?4 imagine that you are applying for a job that requires agood memory , such as a manager at a technology company or a sales position that requires remembering customers names as well as the attributes of different products an

7、d services. would you take a memoryenhancing drug to increase your chances of landing the position? would people who felt uncomfortable taking such a drug find themselves cut out of lucrative career opportunities?memory drugs might also help take the sting out of disturbing memories that we wish we

8、could forget but can t.4the 2004 hit movie eternal sunshine of the spotless mind told the story of a young man seeking just such freedom from the painful memories of a romantic breakup. as you will see in the section on persistence later in the chapter, emotionally arousing events often create intru

9、sive memories, and researchers have already muted emotional memories with drugs that block the action of key hormones. should emergency workers who must confront horrifying accident scenes that can burden them with persisting memories be provided with such drugs? should such drugs be given to rape v

10、ictims who cantforget the trauma? memory drugs might provide some relief to such individuals. but could they also interfere with an individuals ability to assimilate and come to terms with a difficult experience?5 5词汇：synaptic/snptk/adj.（ 解剖学）突触的steroid / strd / n. 类固醇诱人的tantalizing / tntlaz / adj.o

11、nslaught / nsl：t / n.大量lucrative / lu:krtv/adj.有利可图的hit /hit / n.(演出等）成功注释:1. as scientists learn more about memory, we are closing in on this tantalizing goal.随着科学家们对记忆了解增多，我们正接近这个诱人的目 标。2. ltp&snmd： a（long-term potentiation）给突触前纤维一个短暂的高频剌激后，突触传递效率和强度增加几倍且能持续数小时至几天保 持这种增强的现象。ltp发现海马ltp可能是学习记忆的分子基础。1973 年bliss及其合作者，电刺激麻醉兔的内嗅皮层，使海马表层的穿通纤维 兴奋，可在齿状回记录到场电位。先用高频电刺激几秒钟后，再用单个电 刺激，记录到的部分场电位幅度大大超过原先记录的对照值，并可持续几 小时，几天。这个现象称为长时程增强效应（ltp）。1983年发现 nmda（一甲基一 d一门冬氨酸）受体通道复合体在ltp过程中起重要作 用，进一步深化了对ltp在大脑学习记忆中作用的理解。3. a spatial layout ：空间