单项选择题

According to the passage, some tornadoes take people unaware because they ______.

A．produce a sound similar to thunder
B．cannot be seen until it is too late
C．look so much like other clouds
D．carry so many large pieces of debris
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单项选择题
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.
单项选择题
According to the passage, which of the following behaviors is frequently characteristic of funnel clouds
A．Descending from different cloud bases.
B．Occurring in isolated areas.
C．Lasting a long time.
D．Occurring in groups.
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