不同收入家庭的幸福感比较（%）

下列各组混合气体点燃时，不可能发生爆炸的是（　　）

    Twenty years ago, I drove a taxi for a living. One time in the middle of the night, an old lady in her 80s ____ . She gave me an address, and then asked, “Could you ____?”

    “It's not the shortest way,” I answered quietly .

    “Oh, I don't mind,” she said. “I'm in no hurry. I'm on my way to a hospice(临终医院). I ____ The doctor says I don't have very long.”

   I quickly reached over and shut off the meter(计价器). For the next two hours, we drove through the city. She____where she had once worked, the neighborhood where she had lived, the place where she danced as a girl. As sun ____, we got to the hospice.

    “How much should I ____?” she asked, reaching into her purse.

    “Nothing ” I said.

    “You have to____ ” she answered.

    “Oh, there are other passengers,” I answered.

    “You gave an old woman some moment of happiness”. She said: “Thank you.”

    I drove into the fine morning light. Behind me, a door shut. It was the sound of closing of a life. I drove aimlessly, lost in thought.  For the rest of the day, I ____. What if that woman had got an unfriendly drive, or one who was impatient to his shift? What if I had refused to take the run?

阅读《送东阳马生序》选段，完成后面问题。
        余幼时即嗜学。家贫，无从致书以观，每假借于藏书之家，手自笔录，计日以还。天大寒，砚冰坚，手指不可屈伸，弗之怠。录毕，走送之，不敢稍逾约。以是人多以书假余，余因得遍观群书。既加冠，益慕圣贤之道。又患无硕师名人与游，尝趋百里外从乡之先达执经叩问。先达德隆望尊，门人弟子填其室，未尝稍降辞色。余立侍左右，援疑质理，俯身倾耳以请；或遇其叱咄，色愈恭，礼愈至，不敢出一言以复；俟其欣悦，则又请焉。故余虽愚，卒获有所闻。当余之从师也，负箧曳屣，行深山巨谷中，穷冬烈风，大雪深数尺，足肤皲裂而不知。至舍，四支僵劲不能动，媵人持汤沃灌，以衾拥覆，久而乃和。寓逆旅，主人日再食，无鲜肥滋味之享。同舍生皆被绮绣，戴朱缨宝饰之帽，腰白玉之环，左佩刀，右备容臭，烨然若神人；余则缊袍敝衣处其间，略无慕艳意。以中有足乐者，不知口体之奉不若人也。盖余之勤且艰若此。
        今诸生学于太学，县官日有廪稍之供，父母岁有裘葛之遗，无冻馁之患矣；坐大厦之下而诵《诗》《书》，无奔走之劳矣；有司业、博士为之师，未有问而不告、求而不得者也；凡所宜有之书皆集于此，不必若余之手录，假诸人而后见也。其业有不精、德有不成者，非天质之卑，则心不若余之专耳，岂他人之过哉？