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