He (瞥一眼) at the envelope and recognized his uncle's handwriting.

关于同温、同压下等体积的N₂O和CO₂的叙述：①质量相同；②所含碳原子数与氮原子数相等；③所含分子数相等，其中正确的是（   ）

下列各句中，没有错别字且加点字的注音全都正确的一项是（ ）

方程组 的增广矩阵是．

阅读下面的文字，完成下面小题。

在中国社会走向现代的路途中，先进的青年知识者大都经历过从乡村到都市或从中国向西方的迁移。这种迁移既是空间意义上的背井离乡，也是生存方式的重大变异。当个体的生命经验常常与生存环境相分离时，当自己的言说方式常常与意欲言说的内容相背离时，这些青年知识者不得不反思自己的文化之根，并产生强烈的寻根冲动。可以说，正是这种寻根冲动，催生了鲁迅对乡土书写的兴趣。

鲁迅乡土书写的独特之处，首先体现在对乡村信仰的关注和重视。他从立人的目标出发，高度评价了宗教信仰对于民众精神生活所具有的积极作用。乡村宗教与农人赛会是紧密联系在一起的，前者是后者的根基，后者是前者的形式。鲁迅小说中对乡村赛会的肯定、赞美和亲切感，无疑来自童年和少年时代的生命经验，是对自我文化之根的自觉体认。在他看来，那些依傍土地生活的农民，虽然没有受过教育但由于有信仰，哪怕其信仰是迷信，也有对精神生活的追求。做祭祀，演社戏，办赛会，都是农人生活中的乐事，是精神向上的体现。所以，鲁迅写祥林嫂毫不吝惜地把自己的工钱拿去捐门槛，之后就像脱去久久缠身的枷锁一样，满心的轻松，“神气很舒畅，眼光也分外有神”。正是有了这份真正的敬畏，那些辗转挣扎在社会最底层的农人才能在黑暗的日子里看到一丝光明，得到一些慰安。

其次，鲁迅把乡土风景的发现与自己心中的人文理念融合在一起。鲁迅关于风景的思考不是停留在一般意义上的风景，而是特别关注地方色彩——不仅能够生动逼真地传达出故乡风物的特征，而且能够让读者在这种风物特征中感知其具有的独特的文化意味。譬如小说《风波》中对故乡傍晚土场上风景的精细描写，不仅在于再现乡村生活的细节，更是为了生动地显示中国小农经济生产模式下农人日常的生活状态及其与国民根性之间的密切关系。尤其应该指出的是，鲁迅对当下或记忆中的故乡风景的描写，有一个聚焦点，即从通常被人认为柔美的江南风景中发现力的美。这正是鲁迅以“惯于北方的眼睛”对于儿时故乡风景的充满激情且具有创造力的凝视，也是鲁迅精神中的寻根冲动在创作中的显现。

第三，鲁迅通过对乡土颓败的生命感知，写20世纪初期中国乡村农民破产颓败、农民生活“朝着无产的路上恶化”的历史趋势。乡村的凋敝破败，不仅刺激着鲁迅对农民命运的强烈关注，而且对作家的乡心也构成沉重的压迫。因为故乡的风物不再，人事日非，导致作家对故乡印象的日渐模糊，而由此产生的焦虑在本质上乃是作家对自我生命之根日渐萎缩的恐惧。

鲁迅的乡土书写，既有自我之根的触摸，也有民族之根的探寻。自我之根的探寻是个体性的，浸透着个人的生命秘密；民族之根的探寻是公共性的，体现着一个时代精神反思的使命。鲁迅的贡献在于，他天才般地将一个文学家的自我之根与民族之根融合在一起，使其乡土书写充满着一个又一个令人惊喜的发现，既为认识20世纪上半叶中国乡村现状提供了重要的参照，同时也为“乡土”这一文学母题的发展做出了属于自己同时也属于民族的独特贡献。

（摘编自谭桂林《乡土与寻根——论鲁迅对乡村的发现》）

气体体积的大小与许多因素有关．当温度和压强一定时，气体体积主要取决于（   ）

We're (登记) the baby's birth this morning.

阅读下面的文字，完成下面小题。

菊花品种甚多，在众多的花卉中也许是最多的。

首先，有各种颜色。①___________。“鞠有黄华”、“吹落黄花满地金”，“黄华”和菊花是同义词。后来就发展到什么颜色都有了。黄色的、白色的、紫的、红的、粉的，都有。挪威的散文家别伦·别尔生说，各种花里只有菊花有绿色的。也不尽然，牡丹、芍药、月季都有绿的，但像绿菊那样绿得像初新的嫩蚕豆那样，确乎是没有。

其次，花瓣形状多样，有平瓣的，有卷瓣的，有管状瓣的。在镇江焦山见过一盆“十丈珠帘”，细长的管瓣下垂到地，说“十丈”当然不可能，但三四尺是有的。

北京的菊花和南方的差不多，狮子头、蟹爪、小鹅……南北皆相似，②___________。如一种浅红的瓣，极细而卷曲如一头乱发的，上海人叫它“懒梳妆”，北京人也叫它“懒梳妆”，因为得其神韵。

有些南方菊种北京少见。扬州人重“晓色”，谓其色如初日晓云，北京似没有。“十丈珠帘”，我在北京没见过。“枫叶芦花”，紫平瓣，有白色斑点，也没有见过。

我不赞成搞菊山菊海，让菊花都按部就班，排排坐，或挤成一堆，闹闹嚷嚷。菊花还是得一棵一棵地看，一朵一朵地看。更不赞成把菊花缚扎成龙、成狮子，这简直是糟蹋了菊花。

同温同压下，同体积的N₂和SO₂分子数之比为，物质的量之比为，原子总数之比为，摩尔质量之比为，质量之比为，密度之比为．

阅读理解

    Papa's jaw dropped when Mama told him that Sister had cheated on her final exams—not to succeed but to fail. “It's unbelievable!” he said. “Sister has always been so proud of her good grades!”

    “Yes, she has,” said Mama. “But it's not unbelievable. It just shows how badly she wanted off the swimming team.”

    “Wanted off the swimming team?” said Papa. “She never said anything about that to me.”

    “Of course she didn't,” said Mama. “She was afraid you'd blow your top. You already had her getting a swimming scholarship to college and winning gold medals at the Olympics. Can you imagine how much pressure she must have felt? For her, being on the team couldn't have been much fun.”

    “Oh, my god!” Papa said, clapping a hand to his forehead. “I've been so stupid! I just thought she'd want to be a champion swimmer because she's so good at it.”

    “It's like anything else, dear,” said Mama. “No matter how good at it you are, if it stops being fun, you won't want to do it anymore.”

    Papa put his head in his hands.

    “She must be really mad at me,” he mumbled. “Maybe I should say sorry to her.”

    Sister's footsteps could be heard on the stairs. She came into the kitchen and looked hopefully up at her parents.

    “Honey,” said Mama with a smile, “your papa and I have decided that there's no reason for you to be on the swimming team if you don't want to.”

    Sister's face lit up like a Christmas tree. “Yippee!” she cried.

    “And,” added Papa, “there's no need for any more drills. I'm sure you'll bring your grades back up all by yourself.”

    Sister ran to Papa and jumped into his arms. She gave him a big hug. “I'm going to go play cards with Lizzy!” she said. “See you later!”

    From the kitchen window, Mama and Papa watched their daughter run down the sunny road toward Lizzy's house.

    “It's good to see her happy again,” said Mama.

    “It sure is,” Papa agreed. “As for the swimming team, there's always next year.”

    “If?” Mama prompted him.

    “Oh, right,” said Papa. “If she wants to.”

    Mama smiled. “At least you're learning, dear,” she said. She kissed him.

    “Well, you know what they say,” Papa said. “Better late than never.”

（1）34g NH₃共有　 　mol原子，0.1molH₂S共约有　 　个氢原子．同温同压下，等体积的NH₃和H₂S气体的质量比为　 　，含有的分子数目之比为　 　．

（2）在标准状况下，35.5g Cl₂的体积约是　 　L，将其与氢气完全化合生成氯化氢需氢气的物质的量是　 　mol．

（3）欲配制500mL 0.2mol/L Na₂CO₃溶液，需要用天平称量Na₂CO₃•10H₂O晶体质量为　 ．若从中取出10mL溶液加水稀释至20mL，则此溶液中Na⁺的物质的量浓度为 

假设你是新华中学的学生李华，你原来的外籍教师Professor Johnson已经回到了英国。请你用英语给他写一封电子邮件，包括以下内容：

1）. 感谢他对你的帮助；

2）. 介绍你最近的学习和生活；

3）. 邀请他和家人来中国过春节(the Spring Festival)

注意：

1）. 词数100字左右；

2）. 可以适当增加细节，以使行文连贯。

将25℃、101KPa条件下的氯化氢（HCl）气体49.6L，通入127mL水中（已知水的密度为：1.00g/mL），得到密度为1.19g/mL的盐酸（即氯化氢的水溶液）．（注：25℃、101KPa条件下气体摩尔体积为24.8L/mol．）

他发现学好一门外语是不容易的。

He found not easy a foreign language well.

阅读理解

    When children start kindergarten, evident gaps in science knowledge already exist between Whites and minorities and between youngsters from upper-income and low-income families. And they often deepen into significant achievement gaps by the end of eighth grade if they are not dealt with during elementary school.

    The findings suggest that, in order for the United States to maintain(维持) long-term scientific and economic competitiveness in the world, policymakers need to renew efforts to ensure access(n.使用或见到的机会，权利) to high-quality, early learning experiences in childcare settings, preschools and elementary schools.

    The researchers' study tracked 7,757 children from their start in kindergarten to the end of eighth grade. Researchers found that, among kindergarteners with low levels of general knowledge, 62 percent were struggling in science by the time they reached third grade and 54 percent were struggling in that subject in eighth grade. And general knowledge gaps between minorities and Whites were already large at the time when students began kindergarten.

    “Children growing up in low-income families typically experience comparatively fewer early opportunities to learn about the natural and social sciences,” the authors wrote. “Their parents often have lower educational levels and therefore less science knowledge themselves as well as fewer resources available to direct the children's academic growth. Children raised in poverty often attend poorly resourced schools that futher limit their academic opportunities.”

    Morgan said that, within families, parents who regularly talk and interact with toddlers(学步的儿童) can point out and explain physical, natural and social events occurring around them daily. This might help youngsters learn facts and concepts that will prepare them to take better advantage of science instruction they receive during elementary and middle school.

阅读理解

    Today, we are told, children don't spend enough time in the fresh air. Many of them are addicted to screen on a computer or a TV—they seem to be living in a virtual world. They have lost touch with nature.

    But now 400 organizations in the UK, from playgroups to the National Health Service, are encouraging children to have some “wild time”. They want kids to swap at least 30 minutes of watching TV or playing computer games for time playing outside. Activities such as building dens, climbing trees, rummaging for conkers and playing hide and seek are just some of the things kids can do. Even if they live in a city, they can go on adventures in the garden or the park.

    Children often need a helping hand from mom and dad. They need to be shown what to do and where to go. Andy Simpson from National Health Service says, “We want parents to see what this magical wonder product does for their kids' development, independence and creativity, by giving wild time a go”.

    So despite the complicated world that young people grow up in now, it seems that going back to basics and experiencing “nature's playground” is what modern children need. David Bond from Project Wild Thing says, “We need to make more space for wild time in children's daily routine, freeing this generation of kids to have the sort of experiences that many of us took for granted”.

    This might sound a bit old fashioned to you or maybe, like me, it's made you think about sticking on your boots, getting outdoors and reliving your childhood. There is no age limit on enjoying yourself!

His doctor suspected that Simon had been e to a new virus.

下列说法正确的是(N_A表示阿伏加德罗常数的值)（   ）

若行列式 的元素 的代数余子式的值为 ，则实数 ．

行列式 中，元素3的代数余子式的值是