2. 外语
  3. In astronomy the term "red shift" denotes the extent to which light from a distant galaxy has been shifted towards the red, or l

In astronomy the term "red shift" denotes the extent to which light from a distant galaxy has been shifted towards the red, or l

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问题 In astronomy the term "red shift" denotes the extent to which light from a distant galaxy has been shifted towards the red, or long-wave, end of the light spectrum by the rapid motion of the galaxy away form the Earth.
选项 A、to which light from a distant galaxy has been shifted
B、to which light from a distant galaxy has shifted
C、that light from a distant galaxy has been shifted
D、of light from a distant galaxy shifting
E、of the shift of light from a distant galaxy
答案A
解析 C改成由that引导的定语从句，则extent在定语从句中要么作主语，要么作宾语。但把extent代入句中，发现都不对，因而C错。D、E中the extent之后用介词短语，改变了句意(类似于在名词一章中：用of还是that从句对抽象名词的修饰)。在A、B中，尽管结构有差异，但A表示动作shift是被动的，而B表明主动之意。因为本题题干属于专业知识，一般来说无专业知识光凭我们的主观想象是无法判断其应是“主动”还是“被动”。但在未划线部分，我们发现了一关键词“by”，这给我们这些外行一个提示，该句应用被动语态。
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