448ml某气体在标准状况下的质量为1.28g，求该气体的相对分子质量．

顺次连结空间四边形四边中点所得的四边形一定是四边形.

如图所示，分别向密闭容器内可移动活塞的两边充入空气，H₂和O₂的混合气体，在标准状态下，若将H₂、O₂的混合气体点燃引爆。活塞先左弹，恢复原温度后，活塞右滑停留于容器的中央。则原来H₂、O₂的体积之比可能为（   ）

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    Trekking(徒步旅行）500 miles across Spain is no easy task for anyone, but for the wheelchair user Justin Skeesuck, achieving the dream seemed nearly impossible. However, Skeesuck's lifelong best friend, Patrick Gray, simply didn't accept that idea. He said, "We've done everything together so far. Why don't we have one more adventure?"

    That's exactly what he did — pushing Skeesuck across northern Spain's Camino de Santiago. Though Skeesuck has a muscle disease similar to ALS and high blood pressure, he first got the idea to go on the journey after he watched a travel show about the trail. He said, "I knew immediately since my heart was just telling me, 'You need to do this.'"

    With Gray on board and the blessings of their family, the two best friends from Idaho set off to make Skeesuck's dream of going for the journey a reality. However, neither Gray nor Skeesuck realized how physically and emotionally arduous the trip would be. Not only did they have a strict time limit — about six weeks to get from start to finish, but they also faced extremely difficult obstacles (障碍). With Gray pushing Skeesuck in a three-wheel wheelchair, the pair crossed mountains, rivers and a desert. "I've never been that physically exhausted in my entire life," Gray said. The pair came across countless kind people during their trip who were eager to help them finish their journey, but they refused their help with gentle words. 34 days later, the two best friends finished their journey, realizing a dream that helped them learn about themselves and others. "The adventure has taught me for sure that when you do something with faith, and never give up, amazing things can really happen," Skeesuck said.

    Gray recorded their incredible trip in a book —— " I'll Push You: A Journey of 500 Miles, Two Best Friends and One Wheelchair", which would be published soon. Skeesuck and Gray are also working on a children's book that will tell the story of their adventure. They hope that the book will give kids strength when they deal with difficulties.

He had his camera ready ________he saw something that would make a good picture.

阅读下面的文言文，完成各题。

张耳者，大梁人也。其少时，及魏公子无忌为客。张耳尝亡命游外黄。外黄富人女甚美，嫁庸奴，亡其夫，去抵父客。父客素知张耳，乃谓女曰：“必欲求贤夫，从张耳。”女听，乃卒为请决，嫁之张耳。女家厚奉给张耳，张耳以故致千里客。乃宦魏为外黄令，名由此益贤。陈馀者，亦大梁人也。馀年少，父事张耳，两人相与为刎颈之交。秦之灭大梁也，张耳家外黄。高祖为布衣时，尝数从张耳游，客数月。秦灭魏数岁，已闻此两人魏之名士也，购求有得张耳千金，陈馀五百金。张耳、陈馀乃变名姓，俱之陈，为里监门以自食。里吏尝有过笞陈馀，陈馀欲起，张耳蹑之，使受笞。吏去，张耳乃引陈馀之桑下而数之曰：“始吾与公言何如？今见小辱而欲死一吏乎?”陈馀然之。奏诏书购求两人，两人亦反用门者以令里中。陈涉起薪，至入陈。张耳、陈馀上谒陈涉。涉及左右生平数闻张耳、陈馀贤，未尝见，见即大喜。陈中豪杰父老乃说陈涉曰：“愿将军立为楚王也。”陈涉遂立为王，以张耳、陈馀为左右校尉，予卒三千人，北略赵地。武臣等从白马渡河。

（武臣）立为赵王。以陈馀为大将军，张耳为右丞相。使人报陈王，陈王大怒，欲尽族武臣等家，而发兵击赵。陈王相国房君谏曰秦未亡而诛武臣等家此又生一秦也不如因而贺之使急引兵西击秦陈王然之，从其计，徙系武臣等家宫中，封张耳子敖为成都君。陈王使使者贺赵，令趣发兵西入关。张耳说武臣曰：“王王赵，非楚意，特以计贺王。楚已灭秦，必加兵于赵。原王毋西兵，北徇燕，南收河内以自广。赵南据大河，北有燕，楚虽胜秦，必不敢制赵。”赵王以为然，因不西兵。

（选自《史记•列传第二十九》）

Many experts hold the view         teacher's development is         the key to better education lies.

阅读下面的文字，完成各题。

大型商场中的书店，有着独特的生存模式，例如地方政府为促进文化繁荣提供财政补贴；书店内搭售文创产品、咖啡等增加收入。在这样的“文化空间”下，书变得     了，它被抽象化，变成一种被供奉的商品。一家书店的开业，大家讨论的是怎样把书店变成“产品”，这种观念的一个前提就是：书本身并不重要。然而，在这种“文化空间”下，依然有一些书店坚持把书作为书店最根本、最核心的存在价值。上海 的季风书园、南京的先锋书店和北京的万圣书园，都靠     的精神获得了读者的口碑。这样的书店，本身就已经成为了一个城市的“文化地标" ，成为读者的精神家园。他们更接近文化，更远离商业。市场的逼迫一 直都在，如果一个城市不能为这样的书店供应支持，至少应该有包容之心，而不能再雪上加霜。人们会对巴黎的莎士比亚书店和花神咖啡馆      ， 是因为那里曾经有过海明威、萨特这样的文化人出没。即便是巴黎这样著名的城市，也会因为这样的文化地标而多几分魅力。任何一个有文化底蕴的城市，都不是靠大型建筑而      的，而是( )，最终才能闻名于世。

阅读下列短文, 从每题所给的A、B、C和D四个选项中, 选出最佳选项

    During my travels through the mountains of Greece I was only ever scared once. It was dusk and as I walked alone I came across six large wolves that were feeding on the body of a dead animal. I had heard many stories about wolves as a child and it was this animal that I feared more than any other. The wolves before me were huge, at least 6 feet long and covered with thick grey fur.

    As I approached, the wolves left the blood-covered snow that surrounded the body and started walking towards me, one after another. They stopped about 20 meters from me and stared. The lead wolf raised his head into the air and took in a deep breath, as if he was smelling my presence. The animals looked both beautiful and terrifying, but I knew I could not show them my fear. As I drew nearer, the lead wolf raised its head once more but this time let out a loud howl(长嚎). The awful cry rang out across the silent valley. I had never heard a more frightening sound. I was almost certain it signaled death.

    Every moment I expected to see the pack dash(猛冲) at me. I knew my only hope was to pretend I had no fear. I walked past the line of wolves, like a general moving among his soldiers. They howled out again. But when they saw that their war-cry did not cause me to change my direction or make me run they feared to come after me, and they let me pass and returned to the dead animal.

    Had I turned back or tried to run away when they marched out to meet me I was certain the whole pack would have attacked me in a moment. But my show of false courage intimidated(威胁) them and kept them back.

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    One hot night last August, I tried everything I could think of — toys, songs etc. to make him fall into sleep, but he just couldn't do it. Since I believed that a long night was waiting for me ahead, I had no choice but to bring a TV into his room to kill off the hours until dawn. I was surprised that the moment I turned on the TV the baby became quiet right away and fixed his little eyes brightly on the screen. Not willing to waste an opportunity for sleep, I then tiptoed(蹑手蹑脚地行进) out of the room, leaving him to watch the boring TV programs. I heard no more of the baby's crying that night and the next morning when I went into his room, I found him still watching TV by himself. I found there was a metaphor(暗喻) in my baby's behavior(行为) for the new generation. When I gave my boy some books to go over, he only spit upon them; when I read to him, he did not feel comfortable. And so it is in the schools with my students. I find that our students don't read and they look down upon reading and make light of those of us who teach it. All they want to do is watch TV. After this experience with the baby, however, I have drawn a conclusion: “Let them watch it!” If television is that much more attractive to children than books, why should we fight against it? Let them watch what they want！

将含有0.1molSiO₂的铝、硅混合物分别与足量NaOH溶液、盐酸混合，充分反应后前者可得到11.2L气体（标准状况），后者可得到6.72L气体（标准状况），则参加反应的n（HCl）与n（NaOH）之比为（   ）

Wish you a m Christmas and a happy New Year.

As a student, you must _______ your teachers.

— Must I turn off the gas after cooking?

— Of course. You can never be ________careful with that.

在下面一段文字横线处补写恰当的语句，使整段文字语意完整连贯，内容贴切，逻辑严密。每处不超过15个字。

母亲是天底下最爱你的人，？同样的意思，换种方式表达，效果就会完全不一样。如果你不想让不懂内情的母亲为你的事担心，你可说：“！”而忌说：“说了你也不懂，别问了！”如果母亲又说起关于他们的“精彩过往”，让你效仿，你可说：“！”而忌说：“你们那一套，早过时了。”改变了沟通方式，母亲听了开心，谈话的气氛也融洽，多好！

A good cyclist can cover a d of over a hundred miles a day.

同温同压下，1体积X₂气体与3体积Y₂气体化合生成2体积气体化合物Z，则化合物Z的化学式可表示为（   ）

—Are you familiar with the music?

— Yes. There was a time _____ this kind of music was quite popular.

下面所列作品相关信息，对应正确的一项是（   ）

A	《沁园春·长沙》	古典诗词	毛泽东	词人自己	革命豪情
B	《红烛》	现代诗	闻一多	新月派	自我牺牲精神
C	《琵琶行》	长篇抒情诗	白居易	琵琶女	文章合为时而著
D	《赤壁赋》	古代散文	苏轼	主客问答	唐宋八大家之首

胆矾晶体（CuSO₄•5H₂O）中4个水分子与铜离子形成配位键，另一个水分子只以氢键与相邻微粒结合．某兴趣小组称取2.500g胆矾晶体，逐渐升温使其失水，并准确测定不同温度下剩余固体的质量，得到如右图所示的实验结果示意图．以下说法正确的是       （填标号）．