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
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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.
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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