How are tornadoes distinguished from whirlwinds? According to the passage, which of the following behaviors is frequently chara

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问题 How are tornadoes distinguished from whirlwinds?
According to the passage, which of the following behaviors is frequently characteristic of funnel clouds?

选项 A、Descending from different cloud bases.
B、Occurring in isolated areas.
C、Lasting a long time.
D、Occurring in groups.

答案D

解析 本题是一道简单分析题。这道题只要考生注意到文中“Tornadoes often occur in groups,...”而其它三个选项是文中没有提到的。
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