如图，抛物线y=ax²+$\frac{3}{2}$x+c与x轴交于点A（4，0）、B（﹣1，0），与y轴交于点C，连接AC，点M是线段OA上的一个动点（不与点O、A重合），过点M作MN∥AC，交OC于点N，将△OMN沿直线MN折叠，点O的对应点O′落在第一象限内，设OM=t，△O′MN与梯形AMNC重合部分面积为S．

（1）求抛物线的解析式；

（2）①当点O′落在AC上时，请直接写出此时t的值；

②求S与t的函数关系式；

（3）在点M运动的过程中，请直接写出以O、B、C、O′为顶点的四边形分别是等腰梯形和平行四边形时所对应的t值．

阅读下面的文字，完成下列各题。

    马的历史，非常悠久。甲骨文中就有马的形象。据史书记载，商周时贵族出行多乘马车或骑马。贵族死后，作为陪葬的马匹也占据着一席之地。霍去病墓的石雕群，唐太宗的昭陵六骏，无不显示出统治者对马的重视。也正是由于马在古时的特殊地位和作用，以及帝王对良马的喜爱，在客观上促进了“马艺术”发展。汉武帝不惜重金和发动战争来换取汗血宝马。马成为汉代绘画和雕塑中经常出现的题材和内容。唐太宗属马，也特别爱马。

    在我国石雕艺术史上，汉代霍去病墓石雕群、唐太宗的昭陵六骏树起了意象造型与写实造型的艺术风格几乎不可逾越的高峰。同一表现对象的马在各朝艺术家的艺术创作中呈现出各式面貌，虽然霍去病墓石雕群与昭陵六骏这两组马的石雕艺术品是在不同时代的特殊风格下成就了它们各自独特的艺术面貌，但它们之间又有着千丝万缕的联系和相通之处。

    一是意象造型与写实造型的统一。虽然历史上大多把霍去病墓石雕群归为写意的类别，而唐昭陵六骏则被看作写实的代表，但在具体的形象塑造方面，这两种艺术手法相互渗透。昭陵六骏继承了霍去病墓的创作手法，采用象征手法，表现重大的历史事件。这两组石雕虽然都刻画的是战马，实质是反映人的勇敢和战争的惨烈。因此不管是霍去病基石雕还是昭陵六骏，不仅是对帝王将相的颂歌，也是无数英勇将士的历史丰碑。霍去病墓纪念性石雕的重要特点，是将独特的艺术构思和石料的选取相结合，因石而得形，因形而造意，因意而施工。《马踏匈奴》是霍去病墓石雕群中最具代表性的一件作品。作品中战马威武雄健，傲然挺立，敌人蜷缩于马下，垂死挣扎，与整个马的轮廓浑然一体。而在整个雕塑的关键部分，如马下胡人的特征运用线刻和浮雕的手法刻出相对写实的形象。这样，将大写意与细微写实的造型手法相结合来表现精妙传神的形象。就马的造型而论，汉马偏于写意，蹄细体肥，外形流畅简洁；唐马偏于写实，注重马体解剖结构的表现。像昭陵六骏，因为皆属初唐时代，故马体的肥臀细腿等特征颇有汉风孑遗，但较之于汉马，显然更写实精确，更注重形体的结构变化，像面部的筋脉、胸肌、蹄筋等皆细致入微，在生动传神上，与汉马有异曲同工之妙。

    二是静态与动态的统一。《马踏匈奴》是我国最早的纪念碑式的大型圆雕，作者以丰富的想象力和浪漫主义手法，表现了霍去病征服入侵者、取得胜利的那一刹那，被踏于马下的匈奴首领手持弓箭仰卧在马腹之下作垂死挣扎状的场景。静静站立的战马与挣扎的胡人形成了鲜明的对比，大权在握的静态与垂死挣扎的动态形成了完美统一。昭陵六骏表现上颇多写实性，刻画出骏马的飞驰、屹立、徐行三种姿势，表现出六骏共同的雄健俊美的外形和勇往直前的气势，显示出他们的情谊，是古代以形传神的成功范例。这两组石雕形象选取了动态和静态中的马的形象，并将其协调统一地安排在同一个整体中。

（摘编自肖顺、李雪松《汉唐石雕中“马”的艺术形象与成就》）

小明和同学去公园春游．在公园门口看到公园的公告如图．

阅读下面材料，然后从各题所给的四个选项中选出一个最佳答案。

    Daniel Olin was 11 years old when his parents moved to Canada. He liked his new school and made friends there, but then things at home started to change. His mum and dad began to argue and the arguments got worse and worse until one day, Daniel's mum left. With his father working long hours, Daniel felt very lonely and very unhappy. He wanted to escape, to run away. And that's what he did.

    Very early one terribly cold morning when the snow was deep on the ground, he packed a bag with some clothes, some chocolate and a map of Canada and set off to a forest. He ran and ran until he could hardly breathe. His feet were heavy with the snow but he still walked on through deep snow, not even watching where he was going.

    Then, disaster struck. A rock hidden by the deep snow caught his feet and Daniel fell to the ground. He had broken the bone. He was very cold and was starting to feel tired, but he knew that if he fell asleep in the snow, he would certainly die from the cold.

    A tree shook ahead. From within the branches, a pair of yellow eyes watched Daniel. The puma had been following him. A puma is a large wild cat with claws that could tear. Daniel into pieces. But instead of moving in for the kill, the puma walked up to Daniel and lay across his chest, arms and legs. Daniel was too frightened to move, but soon the warmth of the animal reached Daniel and he began to feel better. From time to time, the puma pressed his muzzle against Daniel and rocked his head gently. Clearly, the puma knew that Daniel must not fall asleep. This animal should have been a real danger to Daniel and yet the boy began to feel safe.

    They remained like that for several hours until Daniel and the puma heard voices. The rescue team had found them.