GMAT阅读模拟试题考前练习10

>>GMAT模拟题练习：GMAT阅读模拟试题考前练习10

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阅读题目内容

Before the age of space exploration, astronomers assumed that the Moon's core was smaller than the Earth’s, in both relative and absolute terms – the radius of the Earth's core is 55 percent of the overall radius of the Earth and the core's mass is 32 percent of the Earth's overall mass – but they had no way to verify this. Two sets of data gathered by Lunar Prospector have now given astronomers the ability to determine that the Moon's core accounts for 20 percent of the Moon's radius and for a mere 2 percent of its overall mass.

First, scientists measured minute, relatively rapid variations in the wavelength of radio signals from Lunar Prospector as the craft moved towards or away from the Earth. Using these variations, scientists accurately determined even slight changes in the craft's velocity while the craft orbited the Moon, changes resulting from inconsistency in the gravitational pull of the Moon on the craft. The data were used to create a "gravity map" of both near and far sides of the Moon, highlighting new details of the distribution of the Moon's internal mass. Scientists thus determined that the Moon has a small, metallic core, which, if composed mostly of iron, has a radius of approximately 350 kilometers. The second method involved examining the faint magnetic field generated within the Moon itself by the Moon's monthly passage through the tail of the Earth's magnetosphere. This approach confirmed the results obtained through examination of the gravity map.

The size and composition of the Moon's core have serious implications for our understanding of the Moon's origins. If the Moon and Earth developed as distinct entities, the sizes of their cores should be more comparable. In actuality, it seems that the Moon was once part of the Earth and broke away at an early stage in the Earth's evolution, perhaps due to a major asteroid impact that could have loosened a chunk of iron, allowing it to form the core around which the Moon eventually coalesced. Alternatively, according to fission theory, the early Earth may have spun so rapidly that it ejected a quantity of material by so-called centrifugal force, material that later coalesced by mutual gravitational attraction into the Moon.

The author most probably uses the word “so-called” (line 53) to imply that

A.the force may not have been adequate to cause the claimed ejection

B.fission theory may have less explanatory power than impact theory

C.the later coalescence of the Moon’s material may not have occurred as a result of centrifugal force

D.the speed of the early Earth’s rotation may have led to the creation of the Moon

E.the phenomenon in question might more properly be re-named

正确答案：E

GMAT阅读题目解析

最后一段提出，moon可能之前是earth的一个部分，然后给出了两个解释(1due to后面的小行星撞击 2alternatively后面的地球分离出去的假说) A此力度不足以把月球分离出去，和原文信息违背 B选项出现的less explainatory比较级在原文没有体现，原文用的是alternatively，二选一 C选项内容与原文相反 原文说正是因为离心力所以后来聚集成月球，选项错在may not D早起地球旋转可能导致月球形成内容和原文一致，但是没有回答问题，题目问的是作者想要imply什么，而D的内容是原文已经平铺直叙的了，E选项体现出作者弦外之音，对这个名字不是很满意。“所谓的” in question的意思是：讨论中的

上面的模拟题目大家都做完了吗，做阅读是一个可以全方面训练自己的方式，大家要珍惜每次的复习机会哦！想要找更多的GMAT模拟题就来坦途网GMAT考试频道吧，小编在这里为你加油啦！