单项选择题

Scholars and students have always been great travelers. The official case for "academic mobility" is now often stated in impressive terms as a fundamental necessity (47)________ economic and social progress in the world, and (48)________ in the corridors of Europe, but it is certainly (49)________ new. Serious students were (50)________ ready to go abroad in (51)________ of the most (52)________ teachers and the most famous academies. In short, they are (53)________ the likeliest road to mobility of this kind which means also the (54)________ of ideas, the academic movement across frontier, and the great impact upon many (55)________ of people. The point of learning is to share it, (56)________ with colleagues or with other scholars. This exchange has provided for the rapid transmission of knowledge around the world. WORD BANK A. boring B. nothing C. search D. while E. crowds F. for G. something H. exchange I. whether J. stimulating K. always L. debated M. seeking N. groups O. seldom