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57.D It is an indispensable device on an airplane。
58.A Data for analyzing the cause of the crash。
59.C The early models often got damaged。
60.C To make them easily identifiable。
61.A There is still a good chance of their being recovered。
62.B It is based on the concept of positive thinking。
63.A Encouraging positive thinking may do more harm than good。
64.C You are emphasizing the fact that he is not intelligent。
65.C Forcing a person to think positive thoughts may lower their self-esteem。
66.B Meditation may prove to be a good form of psychotherapy。
