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听力原文： Captain Joseph Mackey's airplane was flying over the ocean on its way to Great Britain when engine trouble started. He turned back and made a crash-landing at night in the deep snow of Newfoundland. All the men in the plane were killed except Captain Mackey, who was badly hurt. Captain Mackey waited all the next morning for an airplane to come in search of him, in the afternoon he set out to find help. He went about a mile but found that he was too weak to go on through the snow. Half walking and half crawling, he made his way back to the plane. The second day many planes passed above him, but none of the pilots saw him. The third day Captain Mackey heard a plane coming nearer and nearer, flying very slowly. It flew right over him and passed on. Then he gave up hope of being found. In a few minutes the plane returned, and the pilot dipped one wing to get a clearer view. The pilot came down closer for a better look, and then he saw Captain Mackey waving his arms. The pilot quickly climbed higher and sent a radio message. In a short time a plane came and dropped a sleeping bag, food, medicine, and tools for Captain Mackey.
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One major purpose of this study was to demonstrate whether or not the newer social research techniques could help in broadening and deepening knowledge concerning juvenile delinquency(少年犯罪). Construction of the design was guided by this goal of exploring new methods in the analysis of juvenile delinquency. However, research technique developed in one content area can not be mechanically transferred to another. A new application of them requires substantial changes and it is these innovative modifications which this study offers as its contribution.
Juvenile delinquency has been the subject of many previous studies using a variety of research techniques. This study makes an additional contribution by using a design specially planned to permit a comparison of several approaches.
The drawing up of the study design profited greatly from an extensive survey of previous re searches on crime, undertaken during the earliest stage of the project. It was found that most studies could be classified as belonging to one or more of three broadly conceived types: social background study, family background study and personal motivation study.
Each type has its characteristic design and mode of interpretation and each has produced information of considerable importance. Yet not attempt was made in any of the studies to integrate one or more of these three design types. It became apparent that one of the major contributions a pilot study could make to both method and substantive findings would be to bring all three study types together in one design for the purpose of correlating(使相互关联) their findings and evaluating their relative importance in producing data of use to the practitioner.
In the first paragraph, the author draws an analogy between ______.
This passage mainly deals with the history of passports.
In the United Sates, the passport is valid for 10 years for people under 18.
A．The horse won over the train.B．The horse lost the race.C．The engine broke down and t
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