Paragraph 4 __________. 查看材料A.Importance of staying

Paragraph 4 __________. 查看材料

A.Importance of staying intellectually active

B.Effects of aging on a person"s recall ability

C.Short-term memory versus long-term memory

D.Retention as the second necessity for memory

E.Link between learning strategies and effective memory skills

F.Significance of exercising your muscles

请帮忙给出正确答案和分析，谢谢！