【GMAT考满分阅读RC题库】According to a recent theory, Archean-age gold-qua_真题_答案

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According to a recent theory, Archean-age gold-quartz vein systems were formed more than two billion years ago from magmatic fluids that originated from molten granite-like bodies deep beneath the surface of the Earth. This theory is contrary to the widely held view that the systems were deposited from metamorphic fluids, that is, from fluids that formed during the dehydration of wet sedimentary rocks.

The recently developed theory has considerable practical importance. Most of the gold deposits discovered during the original gold rushes were exposed at the Earth's surface and were found because they had shed trails of alluvial gold that were easily traced by simple prospecting methods. Although these same methods still lead to an occasional discovery, most deposits not yet discovered have gone undetected because they are buried and have no surface expression.

The challenge in exploration is therefore to unravel the subsurface geology of an area and pinpoint the position of buried minerals. Methods widely used today include analysis of aerial images that yield a broad geological overview; geophysical techniques that provide data on the magnetic, electrical, and mineralogical properties of the rocks being investigated; and sensitive chemical tests that are able to detect the subtle chemical halos that often envelop mineralization. However, none of these high-technology methods are of any value if the sites to which they are applied have never mineralized, and to maximize the chances of discovery the explorer must therefore pay particular attention to selecting the ground formations most likely to be mineralized. Such ground selection relies to varying degrees on conceptual models, which take into account theoretical studies of relevant factors.

These models are constructed primarily from empirical observations of known mineral deposits and from theories of ore-forming processes. The explorer uses the models to identify those geological features that are critical to the formation of the mineralization being modeled, and then tries to select areas for exploration that exhibit as many of the critical features as possible.

It can be inferred from the passage that the efficiency of model-based gold exploration depends on which of the following?

I. The closeness of the match between the geological features identified by the model as critical and the actual geological features of a given area

II. The degree to which the model chosen relies on empirical observation of known mineral deposits rather than on theories of ore forming processes

III. The degree to which the model chosen is based on an accurate description of the events leading to mineralization

AI only
BII only
CI and II only
DI and III only
EI, II, and III

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正确答案: D

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zxczxc

第二个不对正好说错了，两者都重要。

2016-07-05 09:59:07 IP属地：北京举报

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喵呜恩

哦这道题的第三个就是说如果能更精确的符合矿化的条件那么这个model 的效率就越高。。。

2018-08-18 20:51:20 IP属地：北京举报

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road2USA

对应原文最后一句话：and then tries to select areas for exploration that exhibit as many of the critical features as possible.
III. The degree to which the model chosen is based on an accurate description of the events leading to mineralization

accurate description= critical features
The degree=as many as possible

2014-12-25 17:41:17 IP属地：河北举报

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Freya57

我知道了，是theories of ore-forming processes。。。原来1，3只是把These models are constructed primarily from empirical observations of known mineral deposits and from theories of ore-forming processes. 分成了两个。。。。ore-forming不认识啊。。。

2016-12-02 17:05:19 IP属地：局域网举报

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myvafeng

II显然不对，杀BCE。I肯定对，关键看III
models to identify those geological features that are critical to the formation of the mineralization being modeled
critical 指向答案的degree

2014-02-16 23:07:59 IP属地：局域网举报

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zhengdi

这么难的文章加点解答多好

2012-03-08 23:20:24 IP属地：保留地址举报

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loveLV

这篇文章还好吧只是这种题型现在不出现了

2012-03-09 20:30:01 IP属地：保留地址举报

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drunkpiano

可惜我还作对了 - -

2012-07-03 23:50:20 IP属地：保留地址举报

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liuruijoy

文章是难，但是题目简单；基本上找到了就就能做对。对于出题人来说，文章简单，题目就难，文章难，题目就简单。古今中外概莫能外。

2012-07-10 23:43:23 IP属地：保留地址举报

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hlx311

模型开发基于：实证观察 + 矿物形成理论；
模型应用：模型提出地表特征，寻找符合的地表特征；问：模型有效性
I. 使用方法越准（即寻找更符合的地表特征），模型越有效；
II. 与模型开发的两个基础不相符，排。
III. 实证观察约精准，模型建造越准，模型越有效。

2020-08-21 20:40:03 IP属地：局域网举报

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正确率： 41%

难度：

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GMAT 考满分题库

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zxczxc

喵呜恩

road2USA

Freya57

myvafeng

zhengdi

loveLV

drunkpiano

liuruijoy

hlx311

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