问题详情

Performing rote memory exercises rarely improves the______of any given subject, but______may nevertheless be useful to the student preparing for an examination.
A．coherence… exercises
B．clarity… heuristics
C．comprehensibility… mnemonics
D．succinctness … explication
E．volubility … summarization请帮忙给出正确答案和分析，谢谢！