根据短文的理解，选择正确答案。    In two days, I will be turning 30. And I was not looking forward to a new decade (十年). I was afraid that the best years of my life were behind me.
    One day, I met with my friend Nicholas. He was a 79-year-old man. He noticed something was different about me and asked if anything was wrong. I told him what I was anxious (焦虑) about and asked him: "What was the best time of your life?"
    Without hesitation, Nicholas replied: "Well, Joe, when I was a child in Austria and everything was taken care of for me, that was the best time of my life."
    "When I was going to school and learning the things I know today, that was the best time of my life."
    "When I got my first job and got paid for my work, that was the best time of my life."
    "When I met my wife and fell in love, that was the best time of my life."
    "World War Ⅱcame, and my wife and I had to leave Austria to save our lives. When we were together and safe on a ship, that was the best time of my life."
    "When I became a young father and watched my children grow up, that was the best time of my life."
    "And now, Joe, I am 79 years old. I have my health, I feel good and I am just as in love with my wife as I was the day we met. This is the best time of my life.

审议通过政府工作报告、批准“十三五”规划纲要、表决通过慈善法……2016年3月16日，十二届全国人大四次会议圆满完成各项议程，在北京胜利闭幕。这说明（    ）

①我国实行人民代表大会制度

②社会主义制度是中华人民共和国的根本制度

③我国的一切权力属于人民，人民有权决定国家的重大事务

④全国人民代表大会行使最高监督权、最高决定权、最高立法权

将边长为1正方形ABCD沿对角线BD折成直二面角A﹣BD﹣C，有如下四个结论：（1）AC⊥BD；（2）△ACD是等边三角形；（3）四面体A﹣BCD的表面积为$1+\frac{\sqrt{3}}{2}$．则正确结论的序号为____ 

在△ABC中，AC=6，cosB= $\frac{4}{5}$ ，C= $\frac{\pi }{4}$ ．

下列诗句中，要求我们树立社会责任意识的是（    ）

①先天下之忧而忧，后天下之乐而乐（范仲淹）

②横眉冷对千夫指，俯首甘为孺子牛（鲁迅）

③苟利国家生死以，岂因祸福避趋之（林则徐）

④衙斋卧听萧萧竹，疑是民间疾苦声（郑板桥）