D forcing the pilot to make an emergency landing.
A the speed of the plane.
C the number of particles in the air.
39 We can infer from the fifth paragraph that
B researchers are not sure about the effectiveness of the lidar detector.
D no more test flights are needed.
A the lidar detector needs improvement.
C passengers often forget to fasten their seatbelts.
【参考答案】36. B37. C38. D39. A40. A
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