方程组 的解集为.

下列叙述正确的是（　　）

While waiting for the opportunity (被晋升), Henry did his best to perform his duty.

假设你是高二学生李华，寒假即将来临，学校要求学生们在寒假期间做件有意义的事情。你和你的好朋友李明商量打算去当志愿者，为保护渌江河做贡献。请根据以下提示，写一篇英语文章，内容包括下面两个方面：

1）渌江河的现状： ①大量垃圾被扔进河里；②大量污水被排放到河里;

2）办法及措施（至少两点）：打捞垃圾 ...

注意：1）词数100个左右；2）可适当增加细节，以使行文连贯。

    The winter holiday is coming. As middle school students, my best friend Li Ming and I are going to do something meaningful.……

—How about your school?

—Oh，very good.You can't find ________ one in this city.

I'd appreciate________if you would turn out the lights.I'm sleepy.

阅读下面的文言文，完成下面小题。

苏颋，字廷硕，弱敏悟，一览至千言，辄覆诵。第进士，调乌程尉。武后封嵩高，除左司御率府胄曹参军。再迁监察御史。长安中，诏覆来俊臣等冤狱，颋验发其诬，多从洗宥。迁给事中、修文馆学士，拜中书舍人。时瑰①同中书门下三品，父子同在禁莞②，朝廷荣之。

玄宗平内难，书诏填委，独顺在太极后阁，口所占授，功状百绪，轻重无所盖。书史白曰：“丐公徐之，不然，手腕脱矣。”中书令李峤曰：“舍人思若涌泉，吾所不及。”迁太常少卿，仍知制诰。遗父丧，起为工部侍郎，不开，终制乃就职。帝问宰相：“有自工部侍郎得中书侍郎乎？”对曰：“陛下任贤惟所命，何资之计？”乃诰以颋为中书侍郎。明日加知制诰。时李乂对掌书命，帝曰：“前世李峤、苏味道文擅当时，号‘苏李’。今朕得顺及义，何愧前人哉！”俄袭封许国公。

开元四年，进同紫微黄门平章事，修国史，与宋璟同当国。璟刚正，多所裁决，颋能推其长。在帝前敷奏璟有未及或少屈颋辄助成之有不会意颋更申璟所执故帝未尝不从二人相得欢甚。璟尝曰；“吾与苏氏父子同为宰相，仆射长厚，自是国器；若献可替否，事至即断，尽公不顾私，则今丞相为过之。”

八年，罢为礼部尚书。俄检校益州大都督长史，按察节度剑南诸州。巂州蛮苴院与吐蕃连谋入寇，获谍者，吏请讨之，颋不听，移书还其谍曰：“毋得尔。”苴院羞悔，不敢侵边。

从封泰山 ， 诏颂朝觐坛，世咨其文。还，分主十铨③事。卒，年五十八。诏赠右丞相，谥曰文宪。颋性廉俭，奉禀悉推散诸弟亲族，储无长赀。自景龙后，与张说以文章显，称望略等，故时号“燕许大手笔”。帝爱其文，曰：“卿所为诏令，别录副本，署臣某撰，朕当留中。”后遂为故事。

（《新唐书·卷一百二十五》）

【注释】①瑰：苏之父苏瑰，官至左仆射。②禁筅：宫门管钥，喻指宫廷中的机要部门。③十铨：唐玄宗采纳御史中丞宇文融的建议，将吏部的官吏选授事物分为十铨，命苏颋等十人主持吏部铨选。

下列有机物结构简式书写错误的是（   ）

对任意的实数x，y，矩阵运算=都成立，则= ．

语法填空。

    Last Friday, my friend David called me and invited me and our friend Tom to a party in his university. Tom and I are in same class. We both wanted to go to the party, but there was a problem--we'd have a final exam on the (come) Monday.

    “Don't worry. We can come back on Sunday and won't miss the exam,” really (want) to go to the party, Tom said. So I decided to go him.

    The party was great and we (true) enjoyed ourselves there. However, we stayed up late on Saturday night and slept all day on Sunday and didn't make it back to our university until Monday morning. We missed the exam. Then we went to our professor's office and explained we missed the exam. We lied that there was a flat tire（车胎漏气）on our way back to the university. Our professor (agree) that we could take the exam the following day.

    When it was time to take the exam, Tom and I (take )to different rooms. After we opened the test paper, we saw only one question, “Which tire?”

    Neither Tom nor I answered the question. Instead we told our professor the truth. Luckily, he later gave (we) the real test paper. And both Tom and I made a (decide): never to lie again.

Check and (调节) the brakes regularly.

在平面直角坐标系xOy中，直线x+y+2=0在矩阵M=对应的变换作用下得到直线m：x﹣y﹣4=0，求实数a，b的值．

Whether in a professional or social setting it's always ________ if you fail to introduce two people when you're their only shared acquaintance.

已知点A在变换 作用后，再绕原点逆时针旋转 ，得到点B.若点 的坐标为 ，求点A的坐标.

We do not need to (羡慕，忌妒)any other person，for our existence is actually unique!

阅读理解

    Edgar Allan Poe was an American writer who helped shape the course of American literature. His life was full of tragedy and despair, but he managed some of the most influential American literature of the 19th century and continues to influence writers to this day.

    The early life of Edgar Allan Poe was quite miserable.Born in 1809, Poe was not yet three years old when his parents died.Adopted by a wealthy family,he got into trouble at school.He  entered the United States Military Academy at West Point,but he dropped out without graduating. His misery continued to his adult life.Later,because of a failed marriage, he suffered from mental illness. He was so upset about real life that he turned to writing.Expressing himself in an unreal and imaginary world was his only comfort.

    The tragedies in Poe's life influenced the tone,style and contents of his writing.His stories usually include death,which help build his reputation as a master of"dark"literature.In his The

    Tell-Tale Heart, the main character goes crazy and kills his roommate while in The Black Cat, the narrator kills his cat in a fit of madness.

    Poe died at the age of 40 in 1849.His life was tragic and short,but his legacy(遗产) is enormous.Poe is credited with creating crime fiction,and many say he contributed greatly to the appearance of science fiction.Fascinated by the scientific theories and new inventions of his time, he wrote about imaginary societies in the future.Writers such as Arthur Conan Doyle,the author of Sherlock Holmes,regarded Poe as the father of detective fiction. Jules Verne, a French writer who helped popularize science fiction,said Poe's work had a direct influence on the stories he wrote.

阅读下面的文字，完成问题。

如果说此前央视大热的《国家宝藏》让国宝能够开口说话，那么故宫博物院推出的系列活动“古画会唱歌”则更进一步。【甲】古典雅致的歌词、行云流水的曲调将千年古画青山绿水的场景烘托、渲染得淋漓尽致。这种新形式让现代人不仅用眼睛来欣赏古画的“静美”，也用耳朵来聆听古画的旋律，更用心体会诗情画意的韵味，通过创新的艺术通感形式，传承并弘扬中华传统文化之精髓。

【乙】《千里江山图》可谓家喻户晓。这幅千古名画就像“最熟习的陌生人”一样让不少人魂牵梦萦，从中我们也深切地感受到人们对文化的渴望、对精神生活的追求。正因如此，古画要变得更有吸引力、拉近与人们的距离，就必须不断拓展和开掘人们欣赏的渠道和深度，以更好地发挥其教育、文化传播的作用。【丙】从《国家宝藏》、《如果国宝会说话》到如今的“古画会唱歌”，我们看到有越来越多的文物，借助科技手段，尊重年轻人的审美习惯，与生动有趣的故事相结合，变得更“接地气”，真正飞入寻常百姓家。

写出电子式：KCl；写出结构式：CO₂

Some fortune-tellers say that they can (预测) future events.

质量相等的 HCl、CO₂、NH₃、CH₄四种气体中，含有分子数目最少的是，在相同温度和相同压强条件下，体积最大的是，密度最小的是．