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    It was unusually quiet in the emergency room on December 25. I didn't think there would be any patients, sighing about having to work on Christmas. Just then five bodies showed up at my desk, a pale woman and four small children.

    “Are you all sick?” I asked doubtfully.

    “Yes,” she said weakly and lowered her head.

    But when it came to descriptions of their presenting problems，things got a little vague. Two of the children had headaches，but the headaches weren't accompanied by the normal body language of holding the head or trying to keep it still. Two children had earaches， but only one could tell me which ear was affected. The mother complained of a cough but seemed to work to produce it.

    Something was wrong，but I didn't say anything but explained that it might be a little while before a doctor saw her. She responded，Take your time; it's warm in here.”

    On a hunch (直觉)，I checked the chart after the admitting clerk had finished registering the family. No address— they were homeless. The waiting room was warm.

    I looked out at the family huddled by the Christmas tree. The littlest one was pointing at the television and saying something loudly and excitedly to her mother. The oldest one was looking at an ornament on the Christmas tree.

    I went back to the nurses' station and mentioned we had a homeless family in the waiting room. The nurses, complaining about working Christmas, turned to compassion for a family just trying to get warm on Christmas. The team went into action，much as we do when there's a medical emergency. But this one was a Christmas emergency.

    We were all offered a free meal in the hospital cafeteria on Christmas Day，so we claimed that meal and prepared a banquet for our Christmas guests. As seriously as we met the physical needs of the patients that came to us that day， our team worked to meet the needs, and exceed the expectations, of a family who just wanted to be warm on Christmas Day. Later，as the family walked to the door to leave, the four year -old came running back, gave me a hug and whispered, "Thanks for being our angels today.”

①甲最近五场比赛得分的中位数高于乙最近五场比赛得分的中位数；②甲最近五场比赛得分的平均数低于乙最近五场比赛得分的平均数；③从最近五场比赛的得分看，乙比甲更稳定；④从最近五场比赛的得分看，甲比乙更稳定.其中所有正确结论的序号是（    ）

①一根头发上系着千钧的重量，比喻情况万分危急。

②自己对自己说话。

③形容黑暗。

④没有目的而悠闲地走。

秋虫入窗

张佐香

        ①清爽的秋夜，不知疲倦的秋虫们正举办免费演奏会。

        ②秋虫在暗夜里兀自鸣叫，从田边野生植物摇摆的节拍里，从我窗前的花坛里，一直鸣叫到凉月遍洒的窗帘上，然后“嗖”的一下破窗而入。侧耳聆听，“丁零零……丁零零……”清亮悦耳，似清风掠过屋檐下时风铃摇曳的音韵，又似满山清泉流过石上时淙淙的喧响。近处的如弹琴，远处的似乎是天籁的蔓延。它以古典的音韵，悄悄地渗入属于我的空间。起初，叫得很零乱，但很快就整齐了起来。不知是谁在指挥，昆虫的大合唱很快便形成了完美的节奏和旋律。一会儿是声浪清脆、整齐雄壮的齐唱，一会儿是声浪前后跟进的二重唱，一会儿又是声部错落的合奏……时起时伏，突然戛然而止，给大合唱来了个大刀阔斧的结尾。

        ③秋夜又复归寂静。随后，一支新的乐曲再次奏响……我无法摆脱秋虫的诱惑，这韵律给我带来了安详和宁静。成千上万不知名的秋虫振翅收放，汇集成沉雄之势，悲壮之声扩散于空气之中，有一种金属薄片柔韧而刚强的意味，听着听着，人便跌入了幻梦。那声音异常深沉、宏远、浑厚、辽阔，仿佛长流不尽的渺渺钟声，神秘、荒凉而又丰富。我期望天色不要再亮再白，这样的陶醉才能凝重而久远。

        ④我想象着一棵树，因身着无数昆虫而成为一件乐器。它浑身是嘴，犹如一把木琴，让洒落于身上的月光也化作音符。是的，昆虫似乎更爱在月光下的秋夜里歌唱。我无法说清它是因为皎洁的月光而情不自禁，还是视歌唱如月光。

        ⑤无数个宁静的秋夜，我清静的耳郭里颤动着虫声的意韵。这虫声如一泓清冽的溪流，从五千年前古老的岁月深处蹦跳而出。这秋虫曾经翻动《诗经》古老的册页，曾经在汉乐府里低吟，曾经在唐诗宋词里留下深深浅浅的韵脚……杜工部的草堂边，陶渊明的竹篱旁，王维的辋川山庄，大约都有秋虫的嘈嘈切切错杂弹。

        ⑥万丈红尘滚滚，物欲湮没不了秋虫的吟唱。今夜，秋虫从时间的彼岸跌落到我的床前枕畔。此时，万籁倶寂，灯光柔和，秋虫的清歌和我的酣梦融为一体。

（选自《读者——校园版》2019年1期）

The farm is .

水是生命之源，为了人类和社会经济的可持续发展，我们应该了解一些有关水的知识。

①天然水中含有许多杂质，可利用吸附、沉淀、过滤和蒸馏等方法净化，其中净化程度最高的方法是 ；其中过滤过程中，玻璃棒的作用是；吸附水中的颜色和异味可以用；

②硬水给生活和生产带来很多麻烦，生活中常用的方法来降低水的硬度；区分硬水和软水用；

③如图是电解水的实验装置，负极产生的气体是，该实验证明水是由 组成的；

④地球上的总储水量虽然很多，但淡水很少，爱护水资源是每个公民的责任和义务。请你写出在生活中节约用水的方法(写一种即可)。