[单项选择]Maybe it’’s a sign of a mature mind when some of life’’s bigger questions-about love, faith, ambition-suddenly seem more manageable than smaller ones, such as:Why did I just open the refrigerator Where on earth did I put my keys Where did I write down that phone number 　　Our capacity for storing and recalling information does not stream down like sand through an hourglass, as neurologists once believed. On the contrary, new research suggests that, when stimulated in the right way, brains of almost any age can give birth to cells and forge fresh pathways to file away new information. This emerging picture has not only encouraged those who treat and care for the 5% of older adults who have dementia (痴呆症) such as Alzheimer’’s disease, but also generated a wave of optimism among those studying memory changes in the other 95%, as well as an increasing public fascination with "memory enhancement" dietary supplements, books and brain-improving techniques. 　　The slight failures of memory tha
A. our brain cells can be producible.
B. our memory may be renewable.
C. most mental illnesses are curable.
D. brain-mending methods are available.

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