大学英语四级阅读理解真题：2013年12月考试真题_大学英语阅读

　　D) Homing signals sent by the pilot before the crash.

　　59. Why was the black box redesigned in 1965?

　　A) New materials became available by that time.

　　B) Too much space was needed for its installation.

　　C) The early models often got damaged in the crash.

　　D) The early models didnt provide the needed data.

　　60. Why did the Federal Aviation Authority require the black boxes be painted orange or yellow?

　　A) To distinguish them from the color of the plane.

　　B) To caution people to handle them with care.

　　C) To make them easily identifiable.

　　D) To conform to international standards.

　　61. What do we know about the black boxes from Air France Flight 447?

　　A) There is still a good chance of their being recovered.

　　B) There is an urgent need for them to be restructured.

　　C) They have stopped sending homing signals.

　　D) They were destroyed somewhere near Brazil.

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