2018年7月5日GRE阅读机经全新分享

信息来源:网络  发布时间:2018-07-02
摘  要:

GRE阅读考试不仅需要考生本身具备熟练的解题技巧和对长难句的应对能力,提升阅读速度也是重要环节。阅读速度提升还是看新发布的2018年7月5日考前精准预测长阅读机经!

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2018年7月5日GRE阅读机经,2018年7月5日GRE机经

  2018年7月5日GRE长篇阅读机经发布,以下是对7月5日GRE阅读中耗时较多难度较高的长阅读题型的文章和题目预测,看完就能提升阅读读文章的速度节省时间提升解题效率!

  长篇阅读

  In 1995 the Galileo spacecraft captured data about Jupiter's atmosphere--namely, the absence of most of the predicted atmospheric water--that challenged prevailing theories about Jupiter's structure. The unexpectedness of this finding fits a larger pattern in which theories about planetary composition and dynamics have failed to predict the realities discovered through space exploration. Instead of "normal planets" whose composition could be predicted by theory, the planets populating our solar system are unique individuals whose chemical and tectonic identities were created through numerous contingent events. One implication of this is that although the universe undoubtedly holds other planetary systems, the duplication of the sequence that produced our solar system and the development of life on Earth is highly unlikely.

  Recently planetary scientists have suggested that the external preconditions for the development of Earth's biosphere probably included four paramount contingencies. First, a climate conducive to life on Earth depends upon the extraordinarily narrow orbital parameters that define a continuously habitable zone where water can exist in a liquid state. If Earth's orbit were only 5 percent smaller than it is, temperatures during the early stages of Earth's history would have been high enough to vaporize the oceans. If the Earth-Sun distance were as little as 1 percent larger, run away glaciations on Earth about 2 billion years ago would have caused the oceans to freeze and remain frozen to this day.

  Second, Jupiter's enormous mass prevents most Sun-bound comets from penetrating the inner solar system. It has been estimated that without this shield, Earth would have experienced bombardment by comet-sized impactors a thousand times more frequently than has actually been recorded during geological time. Even if Earth's surface were not actually sterilized by this bombardment, it is unlikely that any but the most primitive life-forms could have survived. This suggests that only planetary systems containing both terrestrial planets like Earth and gas giants like Jupiter might be capable of sustaining complex life-forms.

  Third, the gravitational shield of the giant outer planets, while highly efficient, must occasionally fail to protect Earth. Paradoxically, while the temperatures required for liquid water exist only in the inner solar system, the key building blocks of life, including water itself, occur primarily beyond the asteroid belt. Thus the evolution of life has depended on a frequency of cometary impacts sufficient to convey water, as well as carbon and nitrogen, from these distant regions of the solar system to Earth while stopping short of an impact magnitude that would destroy the atmosphere and oceans.

  Finally, Earth's unique and massive satellite, the Moon, plays a crucial role in stabilizing the obliquity of Earth's rotational axis. This obliquity creates the terrestrial seasonality so important to the evolution and diversity of life. Mars, in contrast, has wildly oscillating tilt and chaotic seasonality, while Venus, rotating slowly backward, has virtually no seasonality at all.

  1. The passage is primarily concerned with

  A. Enumerating conditions that may have been necessary for a particular development

  B. Outlining the conditions under which scientists may be able to predict certain events

  C. Explaining how a particular finding affected scientists ' understanding of a phenomenon

  D. Suggesting reasons why a particular outcome was more likely to occur than other possible outcomes

  E. Assessing the relative significance of factors that contributed to a particular occurrence

  答案:C

  解析:根据文章第一段内容,可知推出了一个finding,后面都是具体介绍这个发现的,所以围绕的中心是C。

  2. It can be inferred from the passage that the "planetary scientists" would be most likely to agree with which of the following statements concerning the development of complex life forms on Earth?

  A. It might have occurred earlier in Earth's history if cometary impacts had been less frequent than they were.

  B. It could have occurred if Earth's orbit were 1 percent larger than it is but not if Earth's orbit were 5 percent smaller.

  C. It probably follows a pattern common on other terrestrial planets that occupy planetary systems containing gas giants.

  D. Its dependence on the effect that Jupiter's gravitational shield has on Earth was difficult to recognize prior to 1995.

  E. It has been contingent on conditions elsewhere in Earth's solar system as well as on conditions on Earth itself.

  答案:E

  解析:题干问planetary scientists 最有可能同意哪个观点,而且是与the development of complex life forms on Earth有关,定位至第二段开头处开始阅读,运用排除法得出答案。

  3. The author of the passage most likely mentions Mars' "oscillating tilt" primarily in order to

  A. Provide evidence for a proposition about the potential effects of cometary impacts

  B. Emphasize the absence from our solar system of "normal planets"

  C. Contrast the rotational axis of Mars with that of Venus

  D. Characterize the role of other planets in the solar system in earth's development

  E. Emphasize the importance of the Moon to the development of life on Earth

  答案:E

  解析:题干问为何提及Mars会震荡倾斜,定位至最后一段会发现后文提及了Venus与Mars是相反的,因此答案选C。

  除了长阅读机经,还有2018年7月5日GRE机经其他题型预测:作文/短阅读/逻辑/填空/等价/数学,请继续关注百利天下GRE考试频道。 

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