Einstein's theory of relativity is a （ ） in the science field. ( 章节：4 难度：4)
- A、a stone by the side of the road
- B、a meter in the car
- C、milestone
- D、a significant event in history
正确答案:C
答案解析:有
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Einstein's theory of relativity is a （ ） in the science field. ( 章节：4 难度：4)
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