人教版高三英语阅读理解练习一篇，附答案及解析。

体育锻炼可以降低老年痴呆症的风险。

Increasing evidence suggests that being active can reduce a person's risk of dementia（痴呆）. Dementia is the name for the effects of Alzheimer's disease, stroke and other brain disorders.

People may be considered to have dementia if they lose abilities in two or more areas such as memory and language skills. Other signs of dementia include a loss of ability to think clearly or control emotions.

The World Health Organization says about thirty-five million people worldwide are living with dementia.