【单选题】

Why do tornadoes appear to be dark
A．They occur only at night.

B．They are funnel - shaped.
C．They pick up debris from the ground.
D．They are water - laden.

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根据网考网移动考试中心的统计，该试题：

1%的考友选择了A选项

9%的考友选择了B选项

85%的考友选择了C选项

5%的考友选择了D选项

Why do tornadoes appear to be darkA．They occur only at night.