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
How are tornadoes distinguished from whirlwinds
A．Whirlwinds rotate in a different direction that tornadoes do.
B．Tornadoes travel over land and whirlwinds over water.
C．Tornadoes are larger than whirlwinds.
D．Only tornadoes are funnel-shaped.
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