单项选择题

In December 1997, a United Airlines flight hit unexpected rough air,

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.

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单项选择题The last paragraph tells us, among other things, that

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.

单项选择题We can infer from the fifth paragraph that

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.