北京新航道给广大的托福考试的学子们提供实用的资讯指导和考试培训，帮助考生来解决相关的各种问题。托福阅读一直是比重比较大的一个类型题，分值和其他题型对等，但是量却比较大，遇到的生词难点也比较多。一篇文章理解不好，可能会一连错题，所以说做好阅读很重要。那么，怎么样才能阅读速度和答题率呢，北京新航道的老师们指出，平时要多练习，再辅助于各种阅读的技巧，相信大家能拿到阅读的。下面使我们整理的一些阅读相关的材料，考生可以看看，增加知识面锻炼阅读能力。

　　麻醉，是各种手术中不可缺少的环节。麻醉被广泛应用了年，但目前为止，为什么药物能在人体内工作并让人在一段时间内失去知觉仍是神经科学中的未解之谜。

　　If you've ever had major surgery, you probably remember lying down and waking up--but nothing in between. Learn about anesthetics on this Moment of Science.

　　If you’ve ever had major surgery, you probably remember lying down and waking up–but nothing in between. Thanks to the anesthesiologist, during the actual surgery you were out of it: immobilized and insensitive to pain. But until recently scientists had little understanding of how anesthetics actually work on the cellular level.

　　That’s changed thanks to recent experiments performed by researchers at the University of Zurich, in Switzerland. They knew that anesthetics caused pain receptors in the brain to turn off by acting like most drugs do: anesthetizing drugs attach to particular sites on nerve cells and turn them off. The question was, where on nerve cells do these drugs attach?

　　Nerve cell membranes(细胞膜) have receptors for different kinds of chemicals produced by the brain. Gamma-amino butyric acid(γ-氨基丁酸), or GABA(伽马氨基丁酸), for example, is a chemical that shuts down nerve cells. The hypothesis was that general anesthesia works by binding to GABA receptors on a nerve cell, thereby activating the receptor and instructing the cell to shut down. So it made sense for the Zurich researchers to focus on GABA receptors.

　　To do this they worked with mice that had been genetically engineered to have nerve cells with GABA receptors that wouldn’t respond to anesthetics. And sure enough, when such mice were given anesthetic drugs they weren’t nearly as immune to pain as regular mice that had also been given pain-blocking drugs. Clearly, GABA receptor sites on nerve cells are part of what allows anesthetics to do their job.

　　上面就是我们新航道为大家整理的一篇托福阅读的材料。读得多懂得多，面对考试也就能够坦然应之了。积少成多是硬道理，望各位考生努力，加油!

　　了解托福考试和培训的信息