【单选题】

Silt and heavy run-off from farms in North Carolina were caused by ______.
A．Hurricanes Irene and Floyd

B．Hurricanes Floyd and Carla
C．an eruption from a volcano
D．deforestation of trees

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根据网考网移动考试中心的统计，该试题：

68%的考友选择了A选项

27%的考友选择了B选项

4%的考友选择了C选项

1%的考友选择了D选项

Silt and heavy run-off from farms in North Carolina were caused by ______.A．Hurricanes Irene and Floyd