15．From the text we know that ______.

　　A．crime victims often fail to give positive identification of the suspects

　　B．the jury relies more on the judge than on the eyewitness for a decision

　　C．police identification is more reliable than that of the ordinary people

　　D．eyewitness testimony plays an essential part in the U．S. court trial

　　答案：D

　　解析：通读全文可知，文章主要介绍了目击者的证词在美国法庭审判中的重要作用。D项最符合文章的主旨大意，故选D项。

　　D

　　It is pretty much a_one­way_street. While it may be common for university researchers to try their luck in the commercial world, there is very little traffic in the opposite direction Pay has always been the biggest deterrent,_as people with families often feel they cannot afford the drop in salary when moving to a university job. For some industrial scientists, however, the attractions of academia（学术界）outweigh any financial considerations.

　　Helen Lee took a 70% cut in salary when she moved from a senior post in Abbott Laboratories to a medical department at the University of Cambridge. Her main reason for returning to academia mid­career was to take advantage of the greater freedom to choose research questions. Some areas of inquiry have few prospects （指望）of a commercial return, and Lee's is one of them.

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