[简答题] Only about (31) ____________of people over 65 become senile. A much more common problem is in fact caused by: (32) ____________. (33) ____________. Nearly (34) ____________of people over 65 has at least one serious illness. Maybe about 15% of older people suffer from (35) ____________. When people become old, there are changes in metabolism, lungs, the senses, (36) ____________and (37) ____________.

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