托福阅读修辞目的题是阅读考试中比较常见的一种题型，tpo则是托福阅读备考最权威的材料，所以托福小编综合二者，为大家集中整理了tpo阅读中考察的修辞目的题及其对应的解析，供大家参考使用。本文带来的是TPO22-3的修辞目的题，一起来看看吧。
TPO22-3 The Allende Meteorite
Paragraph 6
All these diverse constituents are aggregated together to form chondritic meteorites, like Allende, that have chemical compositions much like that of the Sun. To compare the compositions of a meteorite and the Sun, it is necessary that we use ratios of elements rather than simply the abundances of atoms. After all, the Sun has many more atoms of any element, say iron, than does a meteorite specimen, but the ratios of iron to silicon in the two kinds of matter might be comparable. The compositional similarity is striking. The major difference is that Allende is depleted in the most volatile elements, like hydrogen, carbon, oxygen, nitrogen, and the noble gases, relative to the Sun. These are the elements that tend to form gases even at very low temperatures. We might think of chondrites as samples of distilled Sun, a sort of solar sludge from which only gases have been removed. Since practically all the solar system's mass resides in the Sun, this similarity in chemistry means that chondrites have average solar system composition, except for the most volatile elements; they are truly lumps of nebular matter, probably similar in composition to the matter from which planets were assembled.
10. In paragraph 6, why does the author mention that "the Sun has many more atoms of any element, say iron, than does a meteorite specimen"?
A. To show how difficult it is to compare the composition of a meteorite with that of the Sun
B. To explain why a comparison of the compositions of a meteorite and of the Sun has to be done in terms of ratios of elements
C. To identify the most common element in both the Sun and meteorite specimens
D. To emphasize how much larger the Sun is than any meteorite specimen
解析：修辞目的题，先看例子所在句，但这句话整个是一个例子，所以看前一句。前句说为比较陨星和太阳的组分，应该应用的是元素的比值而不是单纯应用元素的丰度，所以正确答案是B，C和D完全不靠谱，A的difficult原文没说，不选
[6]所有这些各种各样的组分被凝聚到一起形成了球粒陨石，就像与太阳具有很多相似化学组分的阿伦德陨星。为了比较陨星和太阳的组分，我们需要比较元素的比率，而不是简单地比较原子的丰度 。毕竟，太阳含有的任何一种元素的原子数都要比一块陨星样品含有的多，但是两者间的铁和硅的比率可能是具有可比性的。结果发现它们在组成上具有惊人的相似性。主要的差别是相比太阳，阿伦德陨星失去了大部分的挥发性元素，例如氢、碳、氧、氮以及惰性气体。这些元素即使是在很低的气温下都是气体状态。我们或许会认为球粒陨石是“蒸馏后的太阳”的样本，一种除去气体后的太阳沉淀物。由于太阳系的质量几乎都集中于太阳，这种相似的化学组成意味着除了大部分的挥发性元素外，球粒陨石具有正常的太阳系组成;它们是真正星云物质的团块，很可能与形成行星的物质具有相似的组成。
以上就是托福阅读TPO22-3中的修辞目的题及其解析，大家可以在备考的时候参考复习，希望能够帮助大家的考前准备。最后前程百利祝大家都能取得理想的托福考试成绩。
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