Mom was a teacher most of her life. When she wasn't in the classroom, she was educating her children or grandchildren: correcting our grammar; starting us on collections of butterflies, flowers or rocks; or inspiring a discussion on her most recent “Book of the Month Club” topic. Mom made learning fun.

    It was sad for my three brothers and me to see her illness in her later years. At eighty-five, she suffered a stroke(中风) and she went steadily(不断地) downhill after that.

    Two days before she died, my brothers and I met at her nursing home and took her for a short ride in a wheelchair. While we waited for the staff to lift her limp body back into bed, Mom fell asleep. Not wanting to wake her, we moved to the far end of the room and spoke softly. Several minutes our conversation was interrupted by a muffled sound coming from across the room. We stopped talking and looked at Mom. Her eyes were closed, but she was clearly trying to communicate with us. We went to her side.

    “Whirr,” she said weakly.

    “Where?” I asked. “Mom, is there something you want?” “Whirr,” she repeated a bit stronger. My brothers and I looked at each other and shook our heads sadly.

    Mom opened her eyes, sighed, and with all the energy she could gather said, “Not was, say were!”

    It suddenly occurred to us that Mom was correcting brother Jim's last sentence. “If it was up to me…”

    Jim leaned down and kissed her cheek. “Thanks, Mom,” he whispered. We smiled at each other and once again shook our heads…this time in awe (敬畏) of a remarkable teacher.

                                                                 总有一些东西在大地上醒着
                                                                                                         李雪峰
         ①喧嚣在暮色里沉淀，不久，村庄就沉沉睡着了。灯一盏一盏地熄了，星星一粒一粒地稠了。夜色让一切都沉沉睡熟，让一切生灵都沉入到睡梦中去了。
         ②但总有一些东西在夜晚是醒着的。
         ③那是我十六七岁时的一个春天，我家刚刚搬到村南头新盖不久的新居里。那是一座土屋，墙用新泥搪过，地用榔头狠命地砸捶过。有一天我弯腰在床底下潮湿的纸箱里找书，看见床底下的地上钻出一根鸡蛋粗的白色树芽来。我没理睬它，心想床底下的东西难道还会成就出什么气候。第二天早上起床伸手去床里边摸衣裳的时候，我在衣裳下摸到一个又光又滑的东西，不由大吃一惊，定下神来一看，竟是那棵树芽，白白的，嫩嫩的，顶梢拳头一样没展开的地方，裹着一层滑腻的胎液。一夜竟长得比我的床还高了，这鬼东西，我睡着了，村庄睡着了，它却醒着。如果不理睬它，说不准有一天一觉醒来，我会发现自己已经浑然不觉地睡到了它长成的树上去了。
          ④我钻到床下扳掉了它。我知道，它是那棵泡桐树根绽出的新芽。那是一棵高大的泡桐，原来就长在我放床的地方，盖房时嫌它碍事，就把它锯了，生怕它会长出树芽来，又挖地六七尺，刨出它深藏的树根，这样才觉得踏实。没想到它还会靠那些残根冒出树芽来。在那座老屋里，在那张床底下，我曾一次又一次扳倒过许多冒出的苍白树芽，直到几年后，当我扳得有些心烦意乱时，它才终于不再冒出新的树芽来。我想它还是终于睡着了，那棵泡桐树的灵魂终于睡着了，或许是永远睡着了。
         ⑤前年老家的那座土屋坍塌了，家里人也没理睬它，想不到我以前放床的地方竟长出一棵树苗来，一个春天竟然长出了丈余高。我大吃一惊，本以为已经十多年了，它已经睡熟再不会醒来了，但它依旧醒着，几滴残雨几缕风又让它长成一棵树了。
         ⑥鸟儿睡了，牲畜睡了，我们睡了，村庄睡了，世界睡了，但还是有一些东西在我们睡熟时它却醒着，生长着，并悄悄地打量着这个世界。
         ⑦泥土是不会睡着的，灵魂是不会睡着的，时光是不会睡着的，在我们沉沉睡着的时候，它们还醒着。
         ⑧我终于明白，即使在我们已经睡熟或沉睡的时候，总有一些东西在大地上醒着。
                                                                                                                                                                     （选自《中国当代散文选》）

（Ⅰ）求实数a的值：

（Ⅱ）若不等式f（3x）+f（x+3）≥m对一切实数x恒成立，求实数m的取值范围．