How are tornadoes distinguished from whirlwinds? Why do tornadoes appear to be dark?

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问题 How are tornadoes distinguished from whirlwinds?
Why do tornadoes appear to be dark?

选项 A、They occur only at night.
B、They are funnel-shaped.
C、They pick up debris from the ground.
D、They are water-laden.

答案C

解析本题是一道细节题。这道题的解题关键就是文中"As this funnel dips earthward, it becomes darker because of the debris that is forced into its intensifying vortex."

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大学英语六级

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