题目：
University Physics is intended for students of science and engineering. Primary emphasis is on physical principles and problem- (46) ; historical background and specialized practical applications have been given a place of (47) importance. Many worked-out examples and an extensive collection of problems are included within each chapter.
In this (48) edition, the basic philosophy and outline and the balance between depth of treatment and (49) of subject-matter coverage are unchanged from previous editions. We have tried to preserve those features that users of (50) editions have found desirable, (51) incorporating a number of changes that should enhance the book’s usefulness.
The textbook is adaptable to a wide variety of (52) outlines. The entire textbook can be used for a(n) (53) course two or three semesters in length. For a less intensive course, many instructors will want to (54) certain chapters or sections to tailor the book to their individual needs. The arrangement of this edition facilitates this kind of (55)
50（）
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C解析： 答案A的回答不够精确，B的回答在文中没有证据，只说四化建设在采用补偿贸易，并不能由此就推出它不可缺少；D项原文中没有提及；C项完整地概括了原文意思。答案为 C。
