阅读下面的文言文，完成小题。

郑当时传

    郑当时者，字庄，陈人也。其先郑君尝为项籍将，籍死，已而属汉。高祖令诸故项籍臣名籍，郑君独不奉诏。诏尽拜名籍者为大夫，而逐郑君。

    郑庄以任侠自喜，脱张羽于厄，声闻梁楚之间。孝景时，为太子舍人。每五日洗沐①，常置驿马长安诸郊，存诸故人，请谢宾客，夜以继日，至其明旦，常恐不遍。庄好黄老之言，其慕长者，如恐不见。年小官薄，然其游知交，皆其大父行，天下有名之士也。武帝立，庄稍迁为鲁中尉、济南太守、江都相，至九卿为右内史。以武安侯、魏其时议，贬秩为詹事，迁为大农令。

    庄为太史，诫门下：“客至，无贵贱，无留门者。”执宾主之礼，以其贵下人。庄廉，又不治其产业，仰奉赐以给诸公。然其馈遗人，不过算②器食。每朝，候上之间说，未尝不言天下之长者。其推毂③士及官属丞史，诚有味其言之也，常引以为贤于己。未尝名吏，与官属言，若恐伤之。闻人之善言，进之上，唯恐后。山东士诸公以此翕然称郑庄。

    郑庄使视决河，自请治行五日。上曰：“吾闻‘郑庄行，千里不赍粮'，请治行者何也？”然郑庄在朝，常趋和承意，不敢甚引当否。及晚节，汉征匈奴，招四夷，天下费多，财用益匮。庄任人宾客为大农僦人④，多逋负⑤。司马安为淮阳太守，发其事，庄以此陷罪，赎为庶人。顷之，守长史。上以为老，以庄为汝南太守。数岁，以官卒。卒后家无余赀财。

（《史记》一二○卷）

【注】①洗沐：官员休假算：竹器 ③推毂：推荐 ④僦人：这里指承揽运输的人⑤逋负：拖欠款项

阅读理解

    Mick Polly，an owner of a toy store，lives with his teenage daughter Carolina in Kentucky．He is known as the Bike Man．Over the past five years，Mick has built hundreds of bikes for needy kids．

    One day in 2012，a 13﹣year﹣old boy with a broken bike walked by Mick's house．"I was working in my garage（车库），and he asked if I could fix it，"says Mick，now 53．

    The boy's bike had a broken wheel．Mick sent a post（帖子） on Facebook，asking his friends if they had the needed part．One friend saw the post and gave away two used bikes．Mick took parts from each to build a new set of wheels for the boy．

    Soon after，Mick repaired a bike for the boy's brother and fixed one for his sister．Word spread，and during the year，he had fixed up lots of bikes for local kids whose parents were not able to afford new ones．

    "People are throwing away bikes day and night，"says Mick．

    Mick puts the bikes and bike parts in his garage．"I take off the good tires or the handlebars or the seats and use them，"he says．

    Up to now，the bike man has repaired hundreds of bikes and given away nearly 700newly repaired bikes．They're free，but the kids must agree to two things：They have to learn how to put waste things to good use and they have to try their best to study in school．

    If a kid's grades are low，Mick requires a teacher's note"saying that you're doing your best，"Mick says．Mick also hopes the bikes will get kids off the sofa．"When I was growing up，we all rode our bikes，"he says．"Hopefully these kids can get some exercise．"

我国四大区域中，平均海拔最高的是（   ）