It is the lack of money that has held up the progress in using replacement genes to cure cancer.（）

A. to the proper function of your memory
B. is called long-term memory
C. the capacity to store what you have learned
D. belongs to every long-term memory
E. the ability to remain mentally healthy
F. for younger and older people

A. Effects of aging on a person’s recall ability
B. short-term memory versus long-term memory
C. retention as the second necessity for memory
D. like between learning strategies and effective memory skills
E. Significance of exercising your muscles
F. importance of staying intellectually active