Magoosh阅读问题

程冉UID: 3523005

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.

The author suggests that at least some of “a number of difficult problems...” can be understood by

A.extrapolating from observable phenomenon

B.anticipating the result of the collision of small bodies

C.studying the rate of accretion on planets

D.observing the internal process of planets

E.discounting the dynamics of how orbits change over time

答案是A我选的是B。我知道这个题如果要选的话最好的答案是包含impact和accretion两个内容的。但是就是觉得这个题目中A太牵强，因为做其他题目的时候都是觉得A这种答案太概括了，这里为什么会对？谢谢！

The primary purpose of the passage is to

A.present evidence that argues against a common misconception in the formation of planets

B.undermine a claim regarding the role accretion plays in planetary evolution

C.argue for the importance of using existing planetary conditions to understand prior cosmic occurrences

D.underscore the importance of an astronomical process and describe ways in which we can understand this process

E.discuss how, unless immediate action is taken, astronomers will squander an opportunity to better understand planetary formation

这题答案是D 我选了C我觉得这个前面所提及的用小行星轨道动态和撞击结果来研究古代行星形成的原因，为什么C不能作为答案？最怕这种大意题了~~求教

gjxwinUID: 3457128

建议你问magoosh的tutors。

程冉UID: 3523005

gjxwin 发表于 2014-5-8 22:30
建议你问magoosh的tutors。

弱弱的问一下，怎么问tutors

程冉UID: 3523005

gjxwin 发表于 2014-5-8 22:30
建议你问magoosh的tutors。

弱弱的问一下，怎么问tutors

msunxmUID: 3500649

对于第一题，作者的意思是我们根据一些现在正在发生的现象来观测了解一些我们现在不能探知的，可能丢失的知识。这里面不包含预测的成分，仅仅是由能够看到的现象去分析问题，所以是A。
对于第二题，首先一个C并没有特别不对的地方，但就是不全面。作者在最后一段说了，有了这种渠道我们可以去探知过去planet的形成啊之类的，言外之意，没有这个，我们就没有什么好办法了，这就是突出这种过程的importance，当然这个C也说了，而D的后半句决定了他是答案，作者给了一些别的方法，有些是我们不能做到的，比如查record，它不可行，但也是another way。如果选C，那么答案就不甚全面了。

gjxwinUID: 3457128

程冉 发表于 2014-5-9 12:21
弱弱的问一下，怎么问tutors

email，他们的解答会很详细的

莲心~UID: 3588178

Magoosh的官方解释：

第一题：
Text Explanation
Answer: (A)

The sentence, “This is fortunate…” describes how scientists can observe current events taking place in or regarding planets to learn more about “difficult problems of planetary origin.

(A) supports this idea best. ‘Extrapolating’ means taking information from one instance and applying it to an unknown instance (in this case, the early evolution of planets).

(B) is incorrect because anticipating, or trying to figure out, when small bodies in outer space will crash into each other, does not help shed light on the early formation of planets. Even if collisions were a part of the early formation of planet, (B) is focusing on future collisions.

(C) is a tempting answer. But scientists are relying on a host of planetary occurrences (“the dynamics of their orbital evolution, and the effect...”). While accretion is mentioned as an important process currently taking place, it doesn’t explicitly say the rate of accretion is key to understanding “a number of difficult problems.”

(D) is wrong. The "internal process of planets" is what makes it difficult for scientists to know about the early formation of planets.

(E) is wrong because the passage says that understand the orbit of planets can actually help scientists learn about the early formation of planets. Therefore, scientists would not "discount" information on the dynamics of orbits.

第二题：
Text Explanation
Answer: (D)

The purpose of the passage is to discuss the importance, for those wanting to learn more about the evolution of our planets, of the “impact of small bodies.” The passage specifically advocates using current processes to understand the historic processes.

(A) is wrong because there is no “common misconception” mentioned.

(B) is incorrect because accretion plays an important role

(C) is tempting because the passage does mention this. But the primary purpose is not only to discuss the importance of extrapolation but to assert the importance of the “impact of solid bodies” on the formation of our solar system.

(E) There is no talk in the passage about scientists potentially missing out on an opportunity.