题目内容：
根据下列材料请回答题：A bookless life is an incomplete life. Books influence the depth and breadth of life. They meet the natural______47_F_____for freedom, for expression, for creativity and beauty of life. Learners, therefore, must have books, and the right type of book, for the satisfaction of their need. Readers turn______48_K____ to books because their curiosity concerning all manners of things, their eagerness to share in the experiences of others and their need to ____49 H_____ from their own limited environment lead them to find in books food for the mind and the spirit. Through their reading they find a deeper significance to life as books acquaint them with life in the world as it was and it is now. They are presented with a __50 G_____ of human experiences and come to ___51 N____ other ways of thought and living. And while ____52 I____ their own relationships and responses to life , the readers often find that the ___53 B__ in their stories are going through similar adjustments, which help to clarify and give significance to their own.
Books provide ___54 A_____ material for readers' imagination to grow. Imagination is a valuable quality and a motivating power, and stimulates achievement. While enriching their imagination, books __55 O____their outlook, develop a fact-finding attitude and train them to use leisure ___56 M___. The social and educational significance of the readers' books cannot be overestimated in an academic library.
A． Abundant
B. Characters
C. Communicating
D. Completely
E. Derive
F. Desire
G. Diversity
H. Escape
I. Establishing
J. Narrow
K. Naturally
L. Personnel
M. Properly
N. Respect
O. Widen
请在（47）处填上最佳答案。
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