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题库解析   >   增强题型   >   CR544-556题
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CR544-556题

【OG20-P566-624题】

Astronomer: Most stars are born in groups of thousands, each star in a group forming from the same parent cloud of gas. Each cloud has a unique, homogeneous chemical composition. Therefore, whenever two stars have the same chemical composition as each other, they must have originated from the same cloud of gas.

Which of the following, if true, would most strengthen the astronomer’s argument?


    <p>(A) In some groups of stars, not every star originated from the same parent cloud of gas.</p><p>(B) Clouds of gas of similar or identical chemical composition may be remote from each other.</p><p>(C) Whenever a star forms, it inherits the chemical composition of its parent cloud of gas.</p><p>(D) Many stars in vastly different parts of the universe are quite similar in their chemical compositions.</p><p>(E) Astronomers can at least sometimes precisely determine whether a star has the same chemical composition as its parent cloud of gas.</p><p><br/></p>
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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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