[多项选择]Directions: In general, people are living longer now. Discuss the causes of this phenomenon. Use specific reasons and details to develop your essay.

[简答题]One of the main reasons for people living longer is that we know how to look after ourselves better. We know which foods are good for us and what we have to eat to make sure our bodies get all the healthy things they need. We know why we sometimes get ill and what to do to get better again.

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[听力原文]
People are living longer and longer. As a result, more and more middle-aged adult have to take care of their aging parents. When their parents can no longer care for themselves, these adults may be forced to stay at home to care for them. Taking care of aging parents is quite difficult. For example, an aging parent may become blind. He or she needs children to perform a lot of everyday work. The roles of parents and children are being changed. When children find it difficult to take care of their dependant parents, they often decide to take them to a nursing home.
There, proper care and attention can be given. This allows the children to return to their normal, everyday life.

how are the family roles changed
Children are forced to care for their parents as if their parents were（）

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[听力原文]11-15
People are living longer and longer. As a result, more and more middle-aged adults have to take care of their ageing parents. When your parents can no longer care for themselves, these adults may be forced to stay at home to care for them. Taking care of ageing parents is quite difficult. For example, an ageing parent may become blind. He or she needs children to perform a lot of everyday work. The roles of parents and children are then changed. Children are forced to care for their parents as if their parents were children. When children find it difficult to take care of their dependent parents, they often decide to take them to a nursing home. There, proper care and attention can be given. This allows the children to return to their normal everyday life.

Why do more middle-aged adults have to take care of their aging parents
Because people are living（）.