Modern airplanes have two black boxes: a voice recorder, which tracks pilots conversations,and a flight-data recorder, which monitors fuel levels, engine noises and other operating functions that help investigators reconstruct the aircrafts final moments. Placed in an insulated (隔绝的) case and surrounded by quarter-inch-thick panels of stainless steel, the boxes can withstand massive force and temperatures up to 2 000F. When submerged, theyre also able to emit signals from depths of 20 000 ft. Experts believe the boxes from Air France Flight 447, which crashed near Brazil on June 1, 2009, are in water nearly that deep, but statistics say theyre still likely to turn up. In the approximately 20 deep-sea crashes over the past 30 years, only one planes black boxes were never recovered.
57. What does the author say about the black box?
A) It ensures the normal functioning of an airplane.
B) The idea for its design comes from a comic book.
C) Its ability to ward off disasters is incredible.
D) It is an indispensable device on an airplane.
58. What information could be found from the black box on the Yemeni airliner?
A) Data for analyzing the cause of the crash.
B) The total number of passengers on board.
C) The scene of the crash and extent of the damage.
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