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发布时间：2006-06-23 17:05     点击：

　　(E) Models based on the theory that gold originated from magmatic fluids have already led to 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 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

　　(E) A gold deposit that exhibits chemical halos

　　6. 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.

　　(E) It suggests that simple prospecting methods still have a higher success rate in the discovery of gold deposits than do more modern methods.

　　7. 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.

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