为了提高广大学生的英语水平，提高英语专业学生的专四通过率，特提供以下英语长难句，供大家练习参考：
51. Even the doctoral degree, long recognized as a required “ union card” in the academic world, has come under severe criticism as the pursuit of learning for its own sake and the accumulation of knowledge without immediate application to a professor’s classroom duties.
52. While a selection of necessary details is involved in both, the officer must remain neutral and clearly try to present a picture of the facts, while the artist usually begins with a preconceived message or attitude which is then transmitted through the use of carefully selected details of action described in words intended to provoke associations and emotional reactions in the reader.
53. Articles in the popular press even criticize the Gross National Production (GNP) because it is not such a complete index of welfare, ignoring, on the one hand, that it was never intended to be, and suggesting, on the other, that with appropriate changes it could be converted into one.
54. Other experiments revealed slight variations in the size, number, arrangement, and interconnection of the nerve cells, but as far as psychoneuaral correlations were concerned, the obvious similarities of these sensory fields to each other seemed much more remarkable than any of the minute differences.
55. The Chinese have distributed publications to farmers and other rural residents instructing them in what to watch for their animals so that every household can join in helping to predict earthquakes.
51、即使是学术界被长时间认作必须“同盟卡”的博士学位，现在也因为仅仅为了学习本身和知识的累积而学习，却不把知识应用到教授的教学职责中去而受到了严厉的批评。
52、尽管收集必要的信息对于两者来说都是需要的，但官员必须以中立和清晰的态度来提供事实的画面，而艺术家从已设字的信息或者态度开始，并将其过用激发读者共鸣和情绪反应的词语描写的动用细节描述出来。
53、流行期刊中甚至有文章批评国民生产总值，因为它并不是一个福利目录，一方面忽视了它从来就没有这种倾向，另一方面的建议是通过正确的改变它才能被转化过来。
54、其他的实验揭示神经细胞的大小、数量、排列和连接的细微变化，但就神经关联而言，这些感觉区域的相似性比那些细微的区别更有意义可言。
55、中国向农民和其它农村住户发放了宣传刊物，指导他们观察动物，以便每户人家都能参与帮助地震预报。