单项选择题 Childhood memoirs often gain their poignancy through a sense of displacement: each lesson in experience is accompanied by a loss of（）

单项选择题 The（）employed in this book is overly flamboyant,（）the scientific proof intended to corroborate it.

单项选择题 It is the mark of an educated mind to rest （） with the degree of precision which the nature of the subject （） and not to seek exactness where only an approximation is possible.