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I submit that impact of solid bodies is the most fundamental of all interstellar processes that have taken place on the terrestrial planets: without impact, Earth, Mars, Venus, and Mercury would not exist.

Simply put, the collision of smaller objects is the process by which the terrestrial planets were born. On the surface, that the geological record of the earliest history of impacts on the terrestrial planets has been lost, is troubling. As the process is self-erasing, to a certain extent, the earliest record would have been lost even if processes of melting and internal evolution of the planets had not occurred. But much of the record of the last stages of accretion of the planets is preserved, especially on the moon, Mercury, and Mars. In fact, the last stage of accretion is still going on, albeit at a very slow rate. This is fortunate, because we can study many aspects of the processes of planetary birth by investigation of the nature of small bodies that still exist, the dynamics of their orbital evolution, and the effects that they produce when they ultimately collide with a planet. If impact and accretion were not still occurring, it would be hard to come to grips with a number of difficult problems of planetary origin and early evolution.

第1 题

The primary purpose of the passage is to

present evidence that argues against a common misconception in the formation of planets undermine a claim regarding the role accretion plays in planetary evolution argue for the importance of using existing planetary conditions to understand prior cosmic occurrences underscore the importance of an astronomical process and describe ways in which we can understand this process discuss how, unless immediate action is taken, astronomers will squander an opportunity to better understand planetary formation

正确答案： D 耗时：

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为什么C不对呢？

1楼 | 2022-08-12 10:50:18 回复

小白馒头330 回复小白馒头330 argue for the importance -》我个人理解就是从来没说过这个不重要啊，所以作者完全没argue，他就是在陈述他的观点

2022-10-19 00:28:26 回复
weigan610 回复 weigan610 说过：I submit that impact of solid bodies is the most fundamental of all interstellar processes that have taken place on the terrestrial planets: without impact, Earth, Mars, Venus, and Mercury would not exist. 如果importance是错的话那么D也是错的哦。只能说文章重心讲的是collision，然而你看看C选项里有任何关于collision的提及吗？C和D都是文章所讨论的内容，只不过primory purpose的话只能选D。ways in which we can understand this process包括：1. geological record of the earliest history of impacts，但是他没了。2. last stage of accretion 3. 最近发生的新impact。

2023-01-13 01:50:01 回复

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