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题库 / GmatLaCourse-SC-65
Prospecting for gold during the California gold rush was a relatively easy task, because of erosion, prehistoric glacier movement, and ancient, gold-bearing riverbeds thrust to the surface by volcanic activity, putting gold literally within reach of anybody with a pan or shovel.
because of erosion, prehistoric glacier movement, and ancient, gold-bearing riverbeds thrust to the surface by volcanic activity, putting gold literally within reach of
since erosion, prehistoric glacier movement, and ancient, gold-bearing riverbeds thrust to the surface by volcanic activity put gold literally within reach of
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题目分析：
(A)的核心词是erosion, prehistoric glacier movement, and ancient, gold-bearing riverbeds thrust to the surface by volcanic activity； B的核心词是put。淘金容易是因为金子容易被reach，答案为(B)。