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  3. What does "clear-air turbulence" probably mean? (Paragraph 1) In December 1997, a United Airlines flight hit unexpected rough a

What does "clear-air turbulence" probably mean? (Paragraph 1) In December 1997, a United Airlines flight hit unexpected rough a

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问题 What does "clear-air turbulence" probably mean? (Paragraph 1)
In December 1997, a United Airlines flight hit unexpected rough air,
选项 A、causing a lot of damage to the plane.
B、throwing its passengers out of the cabin.
C、resulting in heavy casualties.
D、forcing the pilot to make an emergency landing.
答案C
解析
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