Many times we do something positive or say something kind, but we don't see the influence it has on other people. We may1these “random（随意的）acts of kindness”, but we never know what happens next. One time, I was lucky enough to2.

    I was returning from a trip3I stopped to refuel and get snack at a gas station. It was late. I was4, and home was still more than two hours away. I was feeling5, and my back hurt from all the6.

    I went7. The checker smiled at me, and we8for a moment. I don't remember9what she said, but I do remember the10she showed me. I was11by her kindness. It kept me going on my journey home.

    The next week, I was cleaning my purse, and I12the receipt. The receipt（收据） reminded me of the clerk's13, and it had the address of the store. I decided to14a thank-you note to her manager. In the letter I told the manager that his employee's kind words and caring attitude stood out to me,15my trip home.

    A week16, that clerk wrote me back. As a result of my note, she got a(n)17from her manager and a company award. I was18. Robin's kindness inspired me to return her positivity.

    Mother Teresa19us to “do small things with great love”. Oftentimes, when we do such small things, we don't get to see the effects of our kind words or deeds,20every so often, we're blessed to discover the positive outcome.

Three Boys and a Dad

    Brad closed the door slowly as Sue left home to visit her mother. Expecting a whole day to relax, he was thinking whether to read the newspaper or watch his favorite TV talk show on his first day off in months. "This will be like a walk in the park," he'd told his wife. "I'll look after the kids, and you can go and visit your mom. "

    Things started well, but just after eight o'clock, his three little "good kids"—Mike, Randy, and Alex—came down the stairs in their night clothes and shouted "breakfast, daddy." When food had not appeared within thirty seconds, Randy began using his spoon on Alex's head as if it were a drum. Alex started to shout loudly in time to the beat(节拍). Mike chanted "Where's my toast, where's my toast" in the background. Brad realized his newspaper would have to wait for a few seconds.

    Life became worse after breakfast. Mike wore Randy's underwear on his head. Randy locked himself in the bathroom, while Alex shouted again because he was going to wash his pants. Nobody could find clean socks, although they were before their eyes. Someone named "Not Me" had spilled a whole glass of orange juice into the basket of clean clothes. Brad knew the talk show had already started.

    By ten o'clock, things were out of control. Alex was wondering why the fish in the jar refused his bread and butter. Mike was trying to show off his talent by decorating the kitchen wall with his colour pencils. Randy, thankfully, appeared to be reading quietly in the family room, but closer examination showed that he was eating apple jam straight from the bottle with his hands. Brad realised that the talk show was over and reading would be impossible.

    At exactly 11:17, Brad called the daycare centre. "I suddenly have to go into work and my wife's away. Can I bring the boys over in a few minutes?" The answer was obviously "yes" because Brad was smiling.

(一)兰事集序

王羲之

永和九年，岁在癸丑，暮春之初，会于会稽山阴之兰亭，修禊事也。群贤毕至，少长咸集。此地有崇山峻岭，茂林修竹，又有清流激湍，映带左右，引以为流觞曲水，列坐其次。虽无丝竹管弦之盛，一觞一咏，亦足以畅叙幽情。是日也，天朗气清，惠风和畅。仰观宇宙之大，俯察品类之盛，所以游目骋怀，足以极视听之娱，信可乐也。

夫人之相与，俯仰一世。或取诸怀抱，悟言一室之内；或因寄所托，放浪形骸之外。虽趣舍万殊，静躁不同，当其欣于所遇，暂得于己，快然自足，不知老之将至；及其所之既倦，情随事迁，感慨系之矣。向之所欣，俯仰之间，已为陈迹，犹不能不以之兴怀，况修短随化，终期于尽！古人云：“死生亦大矣。”岂不痛哉！

每览昔人兴感之由，若合一契，未尝不临文嗟悼，不能喻之于怀。固知一死生为虚诞，齐彭殇为妄作。后之视今，亦犹今之视昔，悲夫！故列叙时人，录其所述，虽世殊事异，所以兴怀，其致一也。后之览者，亦将有感于斯文。

(二)养生主(节选)

庄子

公文轩见右师而惊曰:“是何人也?恶乎介^①也?天与，其人与?”曰:“天也，非人也，天之生是使独也，人之貌有与也。以是知其天也，非人也。”泽雉十步一啄，百步一饮，不蕲^②畜乎樊中。神虽旺，不善也。

老聃死，秦失^③吊之，三号而出。弟子曰:“非夫子之友邪?”曰：“然。”“然则吊焉若此，可乎？”曰：“然。始也吾以为其人也而今非也吾入而吊焉有老者哭之如哭其子少者哭之如哭其母。彼其所以会之，必有不蕲言而言，不蕲哭而哭者。是遁天倍情、忘其所受，古者谓之遁天之刑。适来，夫子时也；适去，夫子顺也。安时而处顺，哀乐不能入也，古者谓是帝之县^④解。”

指穷于为薪，火传也，不知其尽也。

【注】①介:只有一只脚。一说“介”当作“兀”，失去一足的意思。②蕲（qí）：祈求，希望。③秦失(yì):亦写作“秦佚”老聃的朋友。④县(xuán):同“悬”

树突状细胞是一种白细胞，这种免疫细胞负责向T细胞展示入侵病原体的证据，而T细则履行与免疫有关的多项任务。如果 ， 细胞内的蛋白质就会发生变化，树突状细胞会把这些变化展示给T细胞，以便T细胞启动免疫，但科学家以前并不确定树突状细胞是如何完成这一任务的。在最新研究中，他们发现，当树突状细胞发现一个生病或将要死亡的细胞时， ， 并将这些碎片储存在自己体内名为“吞噬体”的小口袋内。研究人员对实验鼠的免疫细胞进行了研究，结果发现，为了向T细胞展示垂死蛋白质的情况以诱发免疫反应，吞噬体会爆裂，使这些爆裂的蛋白质在树突状细胞内部游离。在那里，蛋白质会被分解更小的碎片，到达树突状细胞表面， 。

①w= ×100%

②c=1mol/L

③向上述溶液中再加入VmL水后，所得溶液的质量分数大于0.5w

④向上述溶液中再加入VmL水后，所得溶液的质量分数小于0.5w

金陵后观棋

清·钱谦益^①

寂寞枯枰^②响泬寥^③ ， 秦淮秋老咽寒潮。

白头灯影凉宵里，一局残棋见六朝。

（注）①钱谦益，江苏常熟人，明末清初诗人。南明时为礼部尚书。清军攻陷南京后降清。降清后，写了许多追念明朝的诗。此诗作于顺治四年。②枰：棋局。③泬（xuè）寥：空旷萧条的样子。