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
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.
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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