In education, there should be a good balance【11】the branches of【12】that contribute to effective thinking and【13】judgment. Such balance is defeated by【14】much emphasis on any one field. This【15】of balance involves not only the【16】of the natural sciences, the social sciences and the arts but also relative emphasis among the natural sciences themselves.
【17】, we must have a balance between current and【18】knowledge. The attention of the public is continually drawn to new【19】in scientific fields and the discovery of new knowledge; these should not be allowed to turn our attention away from the sound, established materials that form. the basis of【20】for beginners.
(1)

A. entity
B. auction
C. choice
D. coalition