What does "clear-air turbulence" probably mean? (Paragraph 1) We can infer from the fifth paragraph that

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问题 What does "clear-air turbulence" probably mean? (Paragraph 1)
We can infer from the fifth paragraph that

选项 A、the lidar detector can successfully forecast turbulence.
B、researchers are not sure about the effectiveness of the lidar detector.
C、passenger planes will be used in further experiments.
D、no more test flights are needed.

答案A

解析
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