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  3. What does "clear-air turbulence" probably mean? (Paragraph 1) The turbulence detector can tell the severity of the turbulence b

What does "clear-air turbulence" probably mean? (Paragraph 1) The turbulence detector can tell the severity of the turbulence b

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问题 What does "clear-air turbulence" probably mean? (Paragraph 1)
The turbulence detector can tell the severity of the turbulence by measuring
选项 A、the speed of the plane.
B、the speed of the light.
C、the number of particles in the air.
D、the changes of the particles’ speed.
答案D
解析
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