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阅读下列图文资料,回答问题

材料一:现阶段,我国人口再生产类型实现了由高出生、低死亡、高增长的传统型向低出生、低死亡、低增长的现代型的历史性转变。

材料二:据国家卫生计生委数据统计显示,2013年60岁及以上老年人口达到2亿,本世纪30年代中期将达到4亿,占总人口的比例将从目前的1/7提高到1/4;劳动年龄人口开始减少,2012年比上年减少345万人,预计2023年以后,年均将减少约800万人。

材料三:2013年11月,党的十八届三中全会《决定》明确提出了单独二孩政策——一方为独生子女的夫妇可生育两个孩子的政策。这是新时期我国人口政策的重大调整完善,备受社会关注。

材料四:中国人口分布图。

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        My husband, Bob, died in January 2004. His death was unexpected as well. I 1 condolences(哀悼)from people I hadn't heard from in years: letters, cards, flowers, calls, and visits. I took a bad knock with 2. I was so struggling to3the whys and hows of this terrible thing that had happened to my family, knowing in my heart that there really were no 4. It's just all so sad.

        One message5me deeply. I received a letter from my best friend from sixth6 through high school. We had drifted somewhat since 7 in 1959, as she stayed in our home town and I did not. 8 it was the kind of friendship that could quickly resume even if we9touch for five or ten years.

        Her husband, Peter, had died perhaps 20 years ago at a young age, 10her with deep sorrow and heavy 11: finding a job and raising three young children. She and Pete, 12 Bob and I, had shared one of those rare, close, "love-of-your-life-you-can-never-forget" 13.

        In her letter she 14 an anecdote about my mother who had passed away years ago. She wrote, "When Pete died, your dear mother 15me and said, 'Trudy, I don't know what to say...so I'll just say I love you.'"

        She closed her letter to me repeating my mother's words of so long16, "Bonnie, I don't know what to say...so I'll just say I love you."

        I felt I 17 almost hear my mother speaking to me now. What a 18 message of sympathy! How dear of my friend to cherish it all those years and then 19 it on to me.I love you. 20 words. A gift. A legacy(遗赠物).