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In astronomy the term "red shift" denotes the extent to which light from a dista
In astronomy the term "red shift" denotes the extent to which light from a dista
游客
2024-01-13
4
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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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