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标题: 大全－5－18请教 [打印本页]

作者: jasdesky 时间: 2008-6-25 12:56
标题: 大全－5－18请教

Radio interferometry is a technique for studying details of celestial objects that combines signals intercepted by widely spaced radio telescopes. This technique requires ultraprecise timing, exact knowledge of the locations of the telescopes, and sophisticated computer programs. The successful interferometric linking of an Earth-based radio telescope with a radio telescope on an orbiting satellite was therefore a significant technological accomplishment.

Which of the following can be correctly inferred from the statements above?

(A) Special care was taken in the launching of the satellite so that the calculations of its orbit would be facilitated.

(B) The signals received on the satellite are stronger than those received by a terrestrial telescope.

(C) The resolution of detail achieved by the satellite-Earth interferometer system is inferior to that achieved by exclusively terrestrial systems.

(D) The computer programs required for making use of the signals received by the satellite required a long time for development.（E）

(E) The location of an orbiting satellite relative to locations on Earth can be well enough known for interferometric purposes.

这个题目用有关无关排除法我选了E，但是实在想不明白这个逻辑上是怎么infer的，谁能指点一下啊？

作者: deng2y 时间: 2009-12-31 07:01
我对这题也很疑惑啊～压根没明白题目在讲什么，还请NN解释～

作者: AppleStrudel 时间: 2009-12-31 15:15
原文: Radio Interferometry是一项通过整合相距遥远的天文望远镜截取的信息研究天体细节的技术。这项技术要求超精记时，望远镜的超精定位和超复杂运算。所以这个成功整合了位于地球和卫星轨道上的望远镜的Interferometry技术是一项重大成就。

E. 在进行Interferometric研究中，卫星轨道上的点相对于地球上的某些点的位置是能够很精确测定的。

E选项在第二句里, location一词是直接定位。原文逻辑不复杂，每一句话作用明确。第一句讲一个技术（不懂也不认识没关系）接着解释了一下这个技术。第二句说这技术最需要什么什么条件（evidence）。第三句赞扬此技术成功 (conclusion)。问题问原文能推出什么，答案是原文的改写。

专业词汇有点让人挠头，不过耐心读下来，重中之重的第二句话是不应该有词汇障碍的。

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