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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The author refers to straw embeded in fence posts in order to show
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B．who makes reports about tornadoes.
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American corporations areA. free from international competition.B. immune to industrial consolidation.C. under the intense pressure of international competition.D．stopping the pain 0f industrial consolidation．
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