第五部分：補(bǔ)全短文 (第46～50題，每題2分，共10分)

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A Memory Drug？

It’s difficult to imaging many things that people would welcome more than a memory-enhancing drug.___46___Furthermore,such a drug could help people remember past experiences more clearly and help us acquire new information more easily for school and at work. As scientists learn more about memory, we are closing in on this tantalizing goal.

Some of the most exciting evidence comes from research that has built on earlier findings linking LTP and memory to identify a gene that improves memory in mice. ___47___Mice bred to have extra copies of this gene showed more activity in their NMDA receptors ,more LTP, and improved performance on several different memory tasks—learning a spatial layout ,recognizing familiar objects, and reca11ing a fear-inducing shock.

If these basic insights about genes, LTP, and the synaptic basis of memory can be translated to people—and that remains to be seen—they could pave the way for memory-enhancing treatments._48___ As exciting as this may sound, it also raises troubling issues. Consider the potential educational implications of memory-enhancing drugs. If memory enhancers wereavailable, children who used them 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 to children who don't have access to the latest memory enhancers? Are they left behind in school— as a result handicapped later in life?

__49__Imagine that you are applying for a job that requires a good 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 and services. Would you take a memory-enhancing 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 could forget but can't. The 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 intrusive 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 victims who can't forget the trauma? Memory drugs might provide some relief to such individuals. But could they also interfere with an individual's ability to assimilate and come to terms with a difficult experience?__50__

A. Like steroids for bulking up the muscles, these drugs would bulk up memory.

B. A memory enhancer could help eliminate forgetting associated with aging and disease.

C. What are the potential implications of memory-enhancing drugs for the workplace?

D. We may find ourselves struggling with these kinds of questions in the not-too-distant future.

E. There is a pill that you could take every day to allow you to remember everything.

F. The gene makes a protein that assists the NMDA receptor, which plays an important role in long-term memory by helping to initiate LTP.

參考答案：46 B 依據(jù)上一句的“很難想象還有比能提高人們記憶力的藥物更會(huì)受人們歡迎的東西了”；下面應(yīng)該對(duì)這一現(xiàn)象做出解釋?zhuān)催@種藥物有什么療效；而后一句的Furthermore這一指示詞起到了遞進(jìn)的作用，進(jìn)一步說(shuō)明這種藥物的益處。 More than：非常，極其，十分

47 F 前一句的關(guān)鍵詞是LTP、gene和mice，它講的是有些令人興奮的證據(jù)是從研究中得出的；該研究基于早期連接LTP和記憶的發(fā)現(xiàn)，該結(jié)果確定了提高老鼠記憶的基因；而后一句進(jìn)一步闡述這一發(fā)現(xiàn)，開(kāi)頭的mice可以是一個(gè)連接詞。

48 A 前一句講：如果這種結(jié)果用于人類(lèi)的話，人們就有可能把提高人的記憶力用于臨床。這一句講：就像類(lèi)固醇用于提高人的肌肉能力，這種藥物也可以提高人的記憶力。

49 C 一般情況下，每一段的第一句都是本段的主題句。而該句是一個(gè)問(wèn)句：這種提高記憶力的藥物用于職場(chǎng)有什么潛在的影響呢？緊接著本段其余幾句都提出關(guān)于這種藥物是否會(huì)對(duì)職場(chǎng)的提升有什么影響的問(wèn)題。

50 D 本句是全文的最后一句，一般是總結(jié)性的。鑒于前面都列舉了這種提高記憶力的藥所面臨的一系列問(wèn)題，所以，我們?cè)诓痪玫膶?lái)要面臨這些問(wèn)題。

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（責(zé)任編輯：vstara）

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