【单选题】
What does the passage mainly discuss
A.Patterns of erosion in different mountain ranges.
B.Forces that made the Grand Canyon.
C.The increasing pollution of the Colorado River.
D.The sudden appearance of the Grand Canyon.
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根据网考网移动考试中心的统计,该试题:
21%的考友选择了A选项
59%的考友选择了B选项
10%的考友选择了C选项
10%的考友选择了D选项