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GRE阅读题目解析：断层扫描技术

2017-01-16 16:42:00来源：网络

　　P4

　　1

　　In medical tomography x-rays map the human body's density variations (and hence internal organs); the information from the x-rays, transmitted through the body along many different paths, is recombined to form three-dimensional images of the body's interior.

　　在医疗断层扫描中，X射线绘制出人体密度变化(也就画出了内部器官);X射线经由众多不同路径穿过人体，其携带的信息被整合，以此形成身体内部的三维影像。

　　2

　　It is primarily this multiplicative increase in data obtained from the multipath transmission of signals that accounts for oceanographers' attraction to tomography.

　　主要是这种从多信号路径传输更多数据(的方式)使海洋学家注意到断层扫描技术。

　　3

　　Researchers reasoned that low-frequency sound waves, because they are so well described mathematically and because even small perturbations in emitted sound waves can be detected, could be transmitted through the ocean over many different paths and that the properties of the ocean's interior could be deduced on the basis of how the ocean altered the signals.

　　研究者认为，低频声波可以通过许多不同路径穿透海洋，而基于对海洋如何改变了这些信号的研究，就可以推断出海洋内部的特点，因为低频射线如此适合用数学描述，且即使发出的声波受到微小的扰动也可以被侦测。

　　4

　　Their initial trials were highly successful, and ocean acoustic tomography was born. (128 words)

　　他们的早期试验非常成功，海洋声学测绘也应运而生。

　　8.Which of the following, if presented as the first sentence of a succeeding paragraph, would most logically continue the discussion presented in the passage?

　　(A) Timekeeping in medical tomography must be precise because the changes in travel time caused by density fluctuations are slight.

　　(B) To understand how ocean acoustic tomography works, it is necessary to know how sound travels in the ocean.

　　(C) Ships are another possibility. but they would need to stop every 50 kilometers to lower measuring instruments.

　　(D) These variations amount to only about 2 to 3 percent of the average speed of sound in water, which is about 1,500 meters per second.

　　(E) The device used in medical tomography emits a specially coded signal, easily distinguishable from background noise

　　选 B

　　文段没头没尾，好像说了医院照 CT 的事，后来又跑到海洋内部特点去了。

　　两者的联系是什么。再读一遍句 2 就抓住了。

　　原来都是发出射线，通过不同路径穿过要研究的对象，收集结果并分析，然后得到研究对象内部特点，医院用的的 X 射线射人，海洋学家用的是低频声波射海。

　　所以选 B 。

　　以上就是新东方在线GER频道为你带来的GRE阅读题目解析:断层扫描技术，更多精彩敬请关注新东方在线GRE频道。

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