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和你一样是通路人。不敢说是和你分享学习方法，只是心理上的相互鼓励而已。如有NN们看到我们的贴，希望他们能够给我更多的指点。 考的主要是细节，在全文的理解并不是重点。 如果你记的笔记觉得无用，就把出题点在原文上标出来。然后再在原文把出题点串起来和你的笔记相比较，看看有什么不同，自己的问题在哪。总结！！！再总结。不要担心时间，我基本上连读带做题10 到12分；难的错了有快一半；总结要花30－40分钟。 现在是og第二遍第34篇。好累！！！有时也是很茫然。可是反复读读NN们练习小安阅读方的心得，还是鼓励自己要挺住，不放弃。既然有那么多的先辈多通过这些方法成功了，我们也不比人家少鼻子少眼，就是少一份信心与耐心。天道酬勤！！！ 加油吧！ 刚做完32， 你看，不是也很惨！！伤心之后我还是耐心总结了一下，可惜我纸上的笔记没法贴上来。通过这篇，我已经调整了笔记的方法。好象下篇好多了 Passage 32 According to a recent theory, Archean-age gold-quartz vein systems were formed over two billion years ago from magmatic fluids that originated from molten granitelike bodies deep beneath the surface of the Earth. This theory is (5) 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. he recently developed theory has considerable practical importance. Most of the gold deposits discovered during (10)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 (15) undetected because
they are buried and have no surface expression. (New theory compare to old view have pratical importance.) reader have to ask question why. Given some current situation about the difficult in gold mining.） 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 (20) 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 (25) 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 (30) likely to be mineralized.
Such ground selection relies to varying degrees on conceptual models, which take into account theoretical studies of relevant factors. Compare to other current method used today, the CM can maximize the mining chance. These models are constructed primarily
from empirical observations of known mineral deposits and from theories 35) 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. How the CM works 198. The author is primarily concerned with (A) advocating a return to an older methodology (B) explaining the importance of a recent theory (C) enumerating differences between two widely used methods (D) describing events leading to a discovery (B) (E) challenging the assumptions on which a theory is based 199. According to the passage, the widely held view of Archean- age gold-quartz vein systems is that such systems (A) were formed from metamorphic fluids (B) originated in molten granitelike bodies (C) were formed from alluvial deposits (D) generally have surface expression (A) (E) are not discoverable through chemical tests 200. The passage implies that which of the following steps would be the first performed by explorers who wish to maximize their chances of discovering gold? (A) Surveying several sites known to have been formed more than two billion years ago (B) Limiting exploration to sites known to have been formed from metamorphic fluid. (C) Using an appropriate conceptual model to select a site for further exploration (D) Using geophysical methods to analyze rocks over a broad area (C) (E) Limiting exploration to sites where alluvial gold has previously been found to maximize the chances of discovery the explorer must therefore
pay particular attention to selecting the ground formations most (30) likely to be mineralized. Such ground selection relies to varying degrees on conceptual models, which take into account theoretical studies of relevant factors. 201. Which of the following statements about discoveries of gold deposits is supported by information in the passage? (A) The number of gold discoveries made annually has increased between the time of the original gold rushes and the present. (B) New discoveries of gold deposits are likely to be the result of exploration techniques designed to locate buried mineralization. (C) It is unlikely that newly discovered gold deposits will ever yield as much as did those deposits discovered during the original gold rushes. (D) Modern explorers are divided on the question of the utility of simple prospecting methods as a source of new discoveries of gold deposits. (B) (E) Models based on the theory that gold originated from magmatic fluids have already led to new discoveries of gold deposits. most deposits not yet discovered have gone (15) undetected because
they are buried and have no surface expression. 202. It can be inferred from the passage that which of the following is easiest to detect? (A) A gold-quartz vein system originating in magmatic fluids (B) A gold-quartz vein system originating in meamorphic fluids (C) A gold deposit that is mixed with granite (D) A gold deposit that has shed alluvial gold (D) (E) A gold deposit that exhibits chemical halos were found because they had shed trails of alluvial gold that were easily traced by simple prospecting methods 203. The theory mentioned in line 1 relates to the conceptual models discussed in the passage in which of the following ways? (A) It may furnish a valid account of ore-forming processes, and, hence, can support conceptual models that have great practical significance. (B) It suggests that certain geological formations, long believed to be mineralized, are in fact mineralized, thus confirming current conceptual models. (C) It suggests that there may not be enough similarity across Archean-age gold-quartz vein systems to warrant the formulation of conceptual models. (D) It corrects existing theories about the chemical halos of gold deposits, and thus provides a basis for correcting current conceptual models. (A) (E) It suggests that simple prospecting methods still have a higher success rate in the discovery of gold deposits than do more modern methods. primarily
from empirical observations of known mineral deposits and from theories 35) of ore-forming processes. 204. According to the passage, methods of exploring for gold that are widely used today are based on which of the following facts? (A) Most of the Earth’s remaining gold deposits are still molten. (B) Most of the Earth’s remaining gold deposits are exposed at the surface. (C) Most of the Earth’s remaining gold deposits are buried and have no surface expression. (D) Only one type of gold deposit warrants exploration, since the other types of gold deposits are found in regions difficult to reach. (C) (E) Only one type of gold deposit warrants exploration, since the other types of gold deposits are unlikely to yield concentrated quantities of gold. most deposits not yet discovered have gone (15) undetected because
they are buried and have no surface expression. 205. 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 (A) I only (B) II only (C) I and II only (D) I and III only
(E) (D)I, II and III 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. | 
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发表于 2007-1-25 15:03:00
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