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答案：
C
天文学家：
大部分星以几千为一组产生，一组里每颗星从同样的父气云产生。每团云有独特的，一致的化学成分。因此，无论何时两颗星有相同化学成分，它们起源于同一气云。
增强题，关注结论，这里就是therefore后的最后一句话
A 某些星组，不是每颗星都起源于同样气云；违背题干事实，排
B 同样成分的气云可能相距遥远；讨论距离，无关，排
C 无论何时星形成，它继承了父气云的化学物质；即星的化学物质与气云化学物质相同，如果两颗星有相同化学成分，那他们的父气云的化学成分也一样，可能来自同一气云，搭桥增强，正确
D 宇宙不同部分的很多星化学物质非常相似；无关，排
E 天文学家至少有时能精确确定是否星和父气云有相同成分；sometimes无意义概率，排 
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