Jay Ruckelshaus won a full scholarship to Duke University. Then, just weeks before he was 1 to arrive on campus, he broke his neck in an accident.

    At the Shepherd Center, Jay had eight hours of exercise a day,2 his muscles and working on his 3. “Before, was 4 setting goals and achieving them. But this was not what you could achieve.”

    5the breakthrough came: He was able to 6 on his own, eat, and use an iPad. “The iPad was great, ”he said, “That gave me 7 to the world.” To stretch his mind further, he 8 for courses online.

    Most people, he said,9 he would change his plans to study after his accident. But throughout his 10 his place at Duke University was what kept him going. For Jay, there was never any 11 he would go to Duke. “There was also no doubt from the university, which was wonderful, and wouldn't have been the 12 at some other schools.

    Finally getting into Duke a year later than planned,13being in a wheelchair, he was 14 to have a fun college life. He needed 15, but soon made great friends. In 16 studying for a degree and sitting co-editing a journal, he was able to hang out with friends.

    Also, he thought of other wheelchair users and decided to help them. “I 17I was having an amazing time and meeting amazing people,” he said. The feeling was almost 18. Therefore, he started a charity called Ramp Less Traveled to spread the 19 that college is 20 for students with spinal cord (脊髓) injuries.

金属材料在人类活动中已得到越来越广泛的应用。下列性质属于金属共性的是(    )

    ①故乡，是一幅秘藏的圣符，是一座精神的殿堂。

    ②儿时的故乡，留给我更多的是一份苦涩的记忆。冬天，穿着用人力车外胎做成的“皮草鞋”，鞋面用几根皮条串联，双脚常常被冻得僵硬麻木，捂上一层稻草，才会感到暖和一点。夏天，圆月在天时，我们就得起床，打稻挑谷直到中午田水发烫；下午挑粪插秧种出满田星星，“嗡嗡”的蚊子“亲吻”着肌肤，蚂蟥总是在腿上吃得滚圆……缺吃少穿、终年劳累的生活压得我直不起腰背。我曾一次次爬上高高的山冈，久久眺望山外的世界；一次次诅咒过贫穷的故乡，发誓要找一个幸福快乐的地方。

    ③恢复高考的第一年，我逃难似地离开了故乡，终于完成了乡下人到城里人的转换。除了探望父母回家小住几天外，我很少回去。故乡的山水日渐模糊，故乡的星光日益陌生。

    ④记得有一年，因病修养期间，儿时的玩伴把我接回故乡小住了一段时间；乡亲们用古铜色的脊背，背我走过村前的木桥，张家大妈王家阿婶端来了飘香的饭菜，董家大叔吕家兄弟送来欢声笑语……啊，在温馨甜蜜的故乡，我的每个毛孔都自由地舒张，每个细胞都享受着抚爱；我的整个灵魂得到了洗濯，心胸变得澄澈。

    ⑤于是，我发现，尽管我已身为城里人，但对故乡依然有一种挥之不去的留恋。而且这种留恋深藏心底，不仅没有随着时间的流转而消失，反而越来越清晰，越来越深刻。静静的村庄、浩瀚的蓝天、悠悠的白云、潺潺的小溪、窄窄的小桥构成了故乡诗意的轮廓，也构成我的精神家园。

    ⑥我梦想着退休后回归故乡，安享与乡亲们“把酒话桑麻”的田园生活。正当我为建房选址、设计忙得不亦乐乎时，却传来家乡要筑水库的消息，网上甚至流传出了库区的三维地图。忽然，我有一阵被掏空般的晕眩，一种被连根拔起的痛感。原来，故乡的根已经深深扎入我的心田。我曾走过一个又一个城市，换了一个又一个岗位，心里却一直茫然：梦还有多久？路还有多远？短暂停留，这才发现，惟有故乡的方向能让我内心踏实，安定。

    ⑦为此，我特地回了趟家乡。一路上我在想，故土难离是国人的传统，安土重迁更是国人的习惯。在乡亲们的心底，故乡的脐带真能一刀剪断？

    ⑧可奇怪的是，乡亲们表现得比我想象中要平静得多。不过，偶尔也会感受到两种不同的心境：老人们还幻想着修建水库的选址可以修改；年轻人却关心着水库什么时候开建……

    ⑨天近黄昏，我在村头流连。四周是那样恬静，暖风吹拂发丝，花草散发芬芳，沿着小径，慢慢地、慢慢地走……一种说不清道不明的依恋，就像暮霭一样越来越浓，直到月华照亮了我的泪眼。

    ⑩故乡是一首诗，一首越吟越舒心、越吟越思念的诗。而明天，故乡就要变成一片泽国；而明天，乡亲们也将要搬离这片生养自己的土地。

    ⑪今后，我只能梦回乡关！

（有删改）