某同学举办“新中国65年发展成就展”，拟分“艰苦创业”“曲折探索”“改革开放”“世纪跨越”四个篇章。应入选“改革开放”篇的是（    ）

材料处理：称取新鲜的花菜、辣椒和蒜黄各2份．每份l0g．剪碎后分成两组，一组置于20℃、

另一组置于﹣20℃条件下保存24h．

DNA粗提取：

第一步：将上述材料分别放人研钵中，各加入l5mL研磨液，充分研磨．用两层纱布过滤．

取滤液备用．

第二步：先向6只小烧杯中分别注人10mL滤液，再加人20mL体积分数为95%的冷酒精

溶液，然后用玻璃棒缓缓地向一个方向搅拌，使絮状物缠绕在玻璃棒上．

第三步：取6支试管，分别加入等量的2mol/L NaCl溶液溶解上述絮状物．

DNA检测：在上述试管中各加入4mL二苯胺试剂．混合均匀后，置于沸水中加热5min，待试管冷却后比较溶液的颜色深浅，结果如下表．

分析上述实验过程，回答下列问题：

    I was 8 years old when I found out my father was ill. It was 1993, but I can remember my mother's words as if it were yesterday. “Jessica, I don't want you to take food from your father, because he has AIDS. Be very careful when you are around him.”

    AIDS wasn't something we talked about in my country when I was growing up. From then on, I knew that this would be a family secret. My parents were not together anymore, and my dad lived alone. For a while, he could take care of himself. But when I was 11, his condition worsened. My father's other children lived far away, so it fell to me to look after him.

    We couldn't afford all the necessary medication for him, and because Dad was unable to work. I had no money for school supplies and often couldn't even buy food for dinner. I would sit in class feeling completely lost, the teacher's words muffled as I was thinking how I was going to manage.

    I didn't share my burden (负担) with anyone. I had seen how people reacted to AIDS. Kids laughed at classmates who had parents with the disease. And even adults could be cruel. When my father was moved to the hospital, the nurses would leave his food on the bedside even though he was too weak to feed himself.

    I had known that he was going to die. But after so many years of keeping his condition a secret, I was completely unprepared when he reached his final days. Sad and hopeless, I called a woman at the nonprofit (非营利的) National AIDS Support. That day, she kept me on the phone for hours. I was so lucky to find someone who cared. She saved my life.

    I was 14 when my father died. He took his secret away with him, having never spoken about AIDS to anyone, even me. He didn't want to call attention to AIDS. I do.

阅读下文，回答问题

温暖心窝的话语

       ①初中时，语文老师是个严厉的中年女人，姓王，那时我刚从农村转来县里中学，由于不了解这个老师，被她狠狠地批评了几次，以致一见她就害怕，心里有了阴影。

       ②当时我写字极潦草，虽然在王老师的调教下，已经工整了许多，却依然难以入眼。来新学校上学后，有一次交作文，我对作文还是有信心的，心想就算字写得难看些，作文的质量也能弥补不足。而且，听说王老师就要调走了，这些天上课一直有个年轻的林老师跟着听课，准备接手我们班的语文课。

       ③当我满怀希望地盼到把作文本发下来时，迫不及待地翻开，却如遭了当头一棒，我的三页作文被撕掉了！王老师有这个习惯，谁的作文写得不好，都会撕掉重写。我就经历了好几次。可是没想到，自己很有信心的作文，也是这个命运。而且全班就我一个人被撕了，心里黯淡到了极点。当我把重新写的作文交上去后，过了两天，课代表把我的作文本拿了回来。我翻开一看，还好，这次没有撕。

       ④我随意翻了翻，就在作文后面看到一句鲜红的评语：“你的作文写得是班上最好的，所以我把前一篇撕下来，留着作纪念了！”那一瞬间，我心里猛然一暖，再也没有了怨恨和不满，眼睛一下子就濡湿了！我跑去办公室，却见那个一直跟着听课的林老师在那里，她说：“王老师已经走了，调到别的城市去了！”

       ⑤王老师留在我作文本上的那句话，久久地温暖着我的学生岁月，及至以后走上写作这条路，与此也有着极大的关系。只是那以后，到现在的二十多年里，却再也没能见到她。

       ⑥大学毕业后我走上社会。有一年，我去了一个极偏僻遥远的大山深处的村庄，当了一段时间的代课老师。在那天涯海角般的地方，面对那些纯净的笑脸和清澈的眼睛，我渐渐地爱上那里。每天，除了给孩子们上课，更多的时候，孩子们会问我山外的事，听着我有声有色的讲述，他们的眼中全闪着向往的光。

       ⑦我在那里呆了三个月，离开时，正是秋天，满山的树和花正绚烂得一片深情。孩子们爬上前面的那座山，然后，那个当班长的女生给了一张叠着的纸，让我出了山再看。当我来到镇上，坐上通往县城的汽车，大山已被远远地甩在了身后。我打开那张纸，是一行字：舍不得老师，可不会留您，以后我们会去山外找您！二十个字，二十种笔体，我知道是班上的二十个孩子每人一个字写下的！我回望去，大山已淡成一道浅影，又在我濡湿的目光中朦胧起来。

       ⑧这几句温暖心窝的话语，都留在我的心里，在我的生命里开出永不凋零的花朵。

       ⑨前年，我回到家乡的县城，在街上邂逅初中时后来教我们语文的林老师，她都已经有了白发，提起曾经给我作文本写下那句话的王老师，她却笑着说：“其实，那句话是我写的。王老师走了，我怕你对她有抱怨，我怕你因此对任何人失去信心，所以……”

       ⑩在七月的阳光下，我的眼睛刹那间又濡湿了。

在1，π， $\sqrt{3}$ ，2，﹣3.2这五个数中随机取出一个数，则取出的这个数大于2的概率是____．