根据句意及汉语提示完成句子。

1.The two old people have been ____ (已婚的) for 20 years, and they are a couple.

2.He is my ____ (年龄大的) brother. He is two years older than me.

3.Today it is ____ (正常的) for married women to go out to work.

4. Mobile phones are ____ (广泛地) used in most of  the cities in China.

5. My mother was always cooking for us. Looking after us was her ____ (全职的) job.

6.The ____(夫妇) fall in love with each other.

数据库设计的根本目标是要解决______。

A．数据共享问题

B．数据安全问题

C．大量数据存储问题

D．简化数据维护