哈工大考博英语真题以及答案.docx
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哈工大考博英语真题以及答案.docx
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哈工大考博英语真题以及答案
General English Admission Test For Non-English Major
Ph.D. program
(Harbin Institute of Technology)
Passage One
Questions 1-7 are based on the following passage:
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 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 leas 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.
1. 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
2. According to 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
3. The passage implies that which of the following steps would be the first
performed by explorers whowish 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 form 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.
4. Which of the following statements about discoveries of gold
deposits is supported by information in the passage?
A The number of gold discover 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.
5. It can be inferred from the passage that which of the following is easiest to
detect?
A A gold-quartz vein system originating in magma tic fluids.
B A gold-quartz vein system originating in metamorphic fluids.
C A gold deposit that is mixed with granite.
D A gold deposit that has shed alluvial gold.
6. The theory mentioned in line I 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
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