阅读“七选五”训练
根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Getting older
No one really knows how and why people change as they get older. 36 Aging is a complex and varied process that varies in how it affects different people and organs. In fact, even in one person, different organ systems “age” at different rates.
At a certain point in our lives our body systems will begin to weaken. 37 It may become more difficult for us to see and hear. The slow change of aging causes our bodies to lose some of their ability to bounce
