The word "regression" in the lst paragraph is best replaced by[ A] backward movement.[ B] uncontrolled inclination.[ C] rapid advancement.[ D] unexpected restoration.

正确答案：A
47.A该题为释义题。根据第一段最后一句“...if not to infancy，then at least to a patient's teens．”可知额颞痴呆症可以在某种程度上引起音乐品味的退化，即便不是退到婴儿期，也至少会退到病人十几岁时，故选A。