标题: og16 vebral cr68求助 [打印本页] 作者: lvlv10 时间: 2015-12-25 12:02 标题: og16 vebral cr68求助 Images from ground-based telescopes are invariably distorted by the Earth’s atmosphere. Orbiting space telescopes, however, operating above Earth’s atmosphere, should provide superbly detailed images. Therefore, ground-based telescopes will soon become obsolete for advanced astronomical research purposes.
Which of the following statements, if true, would cast the most doubt on the conclusion drawn above?
(A) An orbiting space telescope due to be launched this year is far behind schedule and over budget, whereas the largest ground-based telescope was both within budget and on schedule.
(B) Ground-based telescopes located on mountain summits are not subject to the kinds of atmospheric distortion which, at low altitudes, make stars appear to twinkle.
(C) By careful choice of observatory location, it is possible for large-aperture telescopes to avoid most of the kind of wind turbulence that can distort image quality.
(D) When large-aperture telescopes are located at high altitudes near the equator, they permit the best Earth-based observations of the center of the Milky Way Galaxy, a prime target of astronomical research.
(E) Detailed spectral analyses, upon which astronomers rely for determining the chemical composition and evolutionary history of stars, require telescopes with more light-gathering capacity than space telescopes can provide.
答案选E
能选对 但是其余四个选项错在哪儿不是太清晰
另外请问大神C.D选项中的large-aperture telescopes在原文中并没有出现 是否可以根据理解默认ground-based telescopes=large-aperture telescopes？还是因为无关直接排除这俩个答案？
多谢！ 作者: lvlv10 时间: 2015-12-27 21:15
没有大神回复啊作者: 阿霖 时间: 2016-8-9 11:26
同问。。作者: 奥迪girl 时间: 2016-11-3 15:05
原题Fact:space tele画质更清晰，ground tele画质总被大气层干扰。Con:先进的research中会弃用ground tele。 推理漏洞：ground tele可能在research中有其他重要作用；space tele可能有其他缺点导致还需要用ground tele. A.讨论的是时间与预算，与题目推理无关。B. 解释说ground tele在山峰就不会遇到某种大气层干扰（注意，只解决了某种干扰，可能还有其他情况会造成其他类型的大气干扰） C. 也是说，通过某种方式，可以避免强风带来的画质干扰，但是还有其他的干扰 D.说了large-aperture tele在某种情况下形成最佳的earth-based observation，但是有可能还是没有space tele好，不算优势。 E. 对于某种research, space tele有重大缺陷。