How are tornadoes distinguished from whirlwinds? According to the passage, some tornadoes take people unaware because they

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问题 How are tornadoes distinguished from whirlwinds?
According to the passage, some tornadoes take people unaware because they

选项 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.

答案B

解析 本题是一道简单分析题。这道题考生注意到文中“Some tornado give no visible warning until their distraction strikes the unsuspecting victim.” “no visible”也就是“cannot be seen.”
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