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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单项选择题
The author refers to straw embeded in fence posts in order to show
A．where tornadoes occur.
B．who makes reports about tornadoes.
C．when tornadoes take form.
D．how tornadoes affect physical objects.
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.
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