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The author is primarily concerned with______ Which of the following statements about discoveries of gold deposits is supported
The author is primarily concerned with______ Which of the following statements about discoveries of gold deposits is supported
admin
2009-04-18
39
问题
The author is primarily concerned with______
Which of the following statements about discoveries of gold deposits is supported by information in the passage?
选项
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.
E、Models based on the theory that gold originated from magmatic fluids have already led to new discoveries of gold deposits.
答案
B
解析
The best answer is B. According to the passage, “most gold deposits not yet discovered have gone undetected because they are buried and have no surface expression” (lines 14-16); as a result, an explorer uses conceptual models “to identify those geological features that are critical to the formation of the mineralization being modeled, and then tries to select areas fro exploration” (lines 35-38). The passage provides no information about the number of gold discoveries or the yield of gold deposits past or present, so choices A and C are not correct. The author does not suggest that there is nay disagreement concerning the utility of simple prospecting methods, which the author says only occasionally lead to new discoveries, so choice D is incorrect. And although the author indicates that the theory that gold originated from magnetic fluids has considerable practical importance, there is no information in the passage indicating that models based on this theory have already led to new discoveries of gold deposits, so choice E is incorrect.
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