What does "clear-air turbulence" probably mean? (Paragraph 1) The last paragraph tells us, among other things, that

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问题 What does "clear-air turbulence" probably mean? (Paragraph 1)
The last paragraph tells us, among other things, that

选项 A、the lidar detector needs improvement.
B、many airlines are interested in the system.
C、passengers often forget to fasten their seatbelts.
D、the lidar detector can be used in a wide range of areas.

答案A

解析
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