若不等式组$\left\{\begin{array}{c}2x-a<1\\ x-2b>3\end{array}\right.$的解集是﹣3＜x＜2，则a+b=____ 

— Twice a year

阅读短文, 从每题所给选项中选出可以填入空白处的最佳选项。

    Once upon a time, a little fish lived in a pond. But she wanted to go to the forest. The pond was deep, and high banks keep it from the view of the forest. Wanting to see the forest, the fish would jump out of water now and then, reaching 1 over the pond with the strength of her tail. It seemed to her that, with a little more effort, she could fly, but unfortunately each time she would fall right back into the 2.

    The fish's mother—a big fish with kind eyes would 3, “What would you want the forest for? We fish must live in water, and that is the way it is.”

    The fish would answer, “I want to go to the forest and that is my 4. And it must come true.”

    So she went to the little fairy(仙子) who had been friends with her for her whole life and pleaded(恳求), “Oh little fairy! I have been living in the water all the time. Now I am 5 my small world. I want to see those big trees covered with beautiful flowers, leaves and fruits. I want to meet 6 and animals.”

    To make her friend happy, the little fairy swung her little wand(魔杖). The rain started falling on the earth, and a few days later, the forest around the pond was covered with water,

    7 the small pond into a lake. The fish swam to the forest. How 8 it was! The fish was very excited because her dream would come true soon.

    “Hello,” the fish said to the flowers and the trees. She 9 on and saw animals sitting on fallen trees which were sticking out of the water. But as soon as she swam closer to the trees, she saw that all the animals were very sad. “We are without 10. The water has flooded the whole forest,” the animals told the fish 11. All this made the fish very unhappy.

    “I am 12 with this rain but my friends—trees and animals are quite unhappy. Oh little fairy! Please 13 the rain. I will go back to my pond. I will be more pleased when trees, animals and birds are happy,” pleaded the fish. The water began to 14 , and the animals were very glad and ran off, and the fish 15 to the pond and she was happier than ever before.

    The art of happiness is to serve all. To be really happy, we must think not only of how we can help ourselves, but how we can help others.

（1）某温度下，2L恒容密闭容器中，X、Y、Z三种气体发生化学反应时，物质的量随时间变化的关系曲线如图所示，则

①反应的化学方程式为____ ；

②0～10s内，用Z表示的化学反应速率____ ；

③X的转化率为____ ；

（2）已知I₂（g）为紫红色，在恒容容器中，可逆反应H₂（g）+I₂（g）⇌2HI（g）达到平衡的标志是____ 

A．混合气体密度恒定不变                B．混合气体的颜色不再改变

C．H₂、I₂、HI的浓度相等                D．混合气体的压强不再改变．

人生难活一份“静”

路来森

    ①人生在世，俗事缠身。为生活而忙绿，为名利而追逐，再加上红尘喧嚣，“静”就成了一份难得的享受。有时候，很羡慕乡下的那些老人。冬春时节，农事不忙，他们喜欢晒太阳。拿一只脚凳，坐在篱笆下、南墙根、柴草垛前，老棉袄一揣，旱烟袋一端，一袋一袋地抽着。闲话家常，或者就只是眯着眼，任煦暖的阳光照在身上，懒洋洋的，一蹲就是一个上午。抬头望望太阳，午饭时间已至，于是拿起脚凳，姗姗归家而去。生命里透着一份从容和潇洒。

    ②其实，这些人并不富有，粗茶淡饭，布衣旧衫，可他们懂得顺乎自然，顺乎性情，不贪婪，不岢求，于是心中无欲。无欲则心静，心静则体闲，晒晒太阳，便也成了一件心满意足的事情。说到底，这些人终是因了心态正，不失真。

    ③《菜根潭》的作者洪应明说：“人心多从动处失真。若一念不生，澄然静坐，云兴则悠然共逝，雨滴则冷然俱清，鸟啼则欣然而会，花落则潇然自得。何地无真境，何物无生机。”

    ④心动，则物欲生；物欲生，则心愈难静；心难静，则杂念丛生。若然心静，则自然万物皆成佳景。看白云，则白云悠悠，一派悠闲；看新雨，则新雨冷然，一派清爽；看花开，则花开潇然，一派灿烂；听鸟鸣，则鸣声欣然，一派欢愉。世间万物，皆成佳境；世间真情，俱成美好。

    ⑤身边有一帮“文人”，特别喜欢聚会。终日呼朋引伴，招引欢谈。餐桌上，喜欢议论是非，臧否人物，似乎天下唯我独尊。这些人似乎什么都“能”，就是不能坐下来认真地写写文章，就是不能写出上好的文章。

    ⑥其实，真正的文人是耐得住寂寞的。一向心如止水，安静得很。在寂寞和安静中，用生命的火燃烧自己，照亮前路；在精诚进取中，创造着辉煌。

    ⑦钱钟书，博闻强记，聪颖明慧。他把自己的一生都沉浸在书山文海之中，聚沙成塔，终成皇皇巨著《管锥编》。晚年的孙犁，深居简出，粗茶淡饭，过得纯然是一介布衣生活。人们见到的孙犁，也只是室内读书，户外散步而已。可孙犁，就是在静默中阅读，在静默中思考，以一颗淡定平静的心，对抗着世俗的喧嚣。看看孙犁晚年的那些作品吧，无论是《芸斋小说》，还是《乡里旧闻》，篇幅不长，都散淡得不得了，也真诚得不得了。特别是他那套《耕堂读书记》，书海捞珠，发论深刻，篇篇都饱满得不得了，深邃得亦不得了。孙犁太静了，静出一份寂寞，静出一份孤独。可他却让自己的生命在孤独寂寞中开出了芬芳的花。花香，足以流芳百世。

    ⑧人生难活一份“静”，谁守住了心中的那份宁静，谁就处世坦然，万古清芬；谁就成为君子贤哲。

（选自《思维与智慧》）