Questions 13 to 15 are based on the passage you have just heard.

A.It has remained basically the same. B.It has become better understood. C.It has been exaggerated. D.It has decreased.
问题2：
A.It is now the second leading cause of death for centenarians. B.It develops more easily in centenarians who are not active. C.It calls for more intensive research. D.It has had no effective cure so far.
问题3：
A.They cherish their life more than ever. B.Their minds fail before their bodies do. C.Their quality of life deteriorates rapidly. D.They care more about their physical health.

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