和 原子核外电子数(判断前后两者的关系)（   ）

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。

Travel Light

    Getting away for a short time always seems like a great idea—until you have to pack. The rule is: pack light. Here are some tips to help you pack.

    Make a list. Think of what you need from your head to your toes. When you've done this once, it'll be easier next time.

    2). Consider buying small-size samples of shampoo, toothpaste, and other items at your local drugstore. You can reuse the plastic containers next time you go away too.

    3). Choosing which clothes to bring is probably the hardest packing decision to make. Think once again from head to toe — hat, shirts, jeans, sneakers, etc. Once you've picked out what you want to bring, think carefully. Do you really need that extra pair of jeans? If so, fine. Don't try to fool yourself. You are the one who will be left holding the bag.

    4). Weather is an important factor in your packing. If it's cold, you could wear a jacket, a sweater, a regular shirt, and a T-shirt. Putting them on will keep you warm. Remember how much easier it will be to carry your bag! As for shoes, you may want to call ahead to see if dress shoes are necessary. If so, one pair will be enough, along with one pair of comfortable shoes. Remember that it is you who have been invited somewhere, not your things. So, do it right—pack light.

A. Mixing and matching is a smart and easy way to lighten your load. B. But packing won't be a problem if you remember one simple rule. C. You will have an easier time if you're weighed down. D. But make sure they're really worth the extra weight. E. It's best to bring these things with you. F. And it'll leave more room in your bag. G. Keep the list for future reference.

目前，学校存在少数考生考试作弊现象。某英文杂志社拟对此现象向中学生征文，标题是“My Opinion on Cheating in Examinations”。请根据下列提示用英语写一篇征文稿。内容要点如下：

主要原因	考试偏多、偏难
	不用功、懒惰
	取悦父母、老师
个人看法	作弊不对，违反校规
	……（其他看法）

注意：

1）短文必须包括所有内容要点，可适当发挥。

2）词数：100左右；

3）参考词汇：作弊 cheat。

体积相等的KCl、CaCl₂、FeCl₃三种溶液，与等体积、等物质的量浓度的AgNO₃溶液均恰好完全反应，则KCl、CaCl₂、FeCl₃三种溶液中溶质的物质的量浓度之比为．

若A为三角形ABC的一个内角，且sinA+cosA= ，则这个三角形是（   ）

将22.4g铜与100mL一定浓度的硝酸反应，铜完全溶解，产生的NO和NO₂混合气体在标准状况下的体积为6.72L，请回答：

实验室欲测定一瓶标签破损的稀硫酸中溶质的质量分数。现取10 g稀硫酸样品，将5%的NaOH溶液逐滴加入到样品中，边加边搅拌，随着NaOH溶液的不断加入，溶液的pH变化如右图所示。试回答：

阅读理解

    You may think that light pollution isn't something extraordinarily important. You may believe that every other type of pollution has a larger impact on the environment that light pollution does. But light pollution is serious.

    Light pollution, or “sky glow”, is the glow you can see at night above cities and towns. Light pollution is a problem that has been accompanying man ever since he started his first fire some 15,000 years ago. Light pollution is the light that comes from streetlights, buildings, parking lots and any other source of light that is reflected or directed into the atmosphere.

    Urban light pollution means that one-fifth of the world's population can no longer see the Milky Way(银河) with the naked eye(肉眼). Many city kids, even if they did look through the orange smog above their heads, would probably see only a handful of stars. We have lost our view of the stars, and we have mucked up our  night-time environment as well. Astronomers are calling for the dark places on Earth to be preserved as national parks.

    Lots of people find the ever-brightening night annoying, and animals that are programmed to prefer the dark may avoid a brightened habitat. Sea turtles can get lost searching for a beach to lay eggs, and their hatchlings(孵化的幼仔)may confuse over-lit beachfront resorts(度假胜地) for the ocean horizon, wasting precious energy needed to find the sea and escape predators(食肉动物). Because their necks aren't yet long enough to see things far away, baby turtles rely on the mirror image of the moon to guide them to the sea, to begin their new life. A car may even hit a particular turtle, which was thinking the light from a nearby city was moonlight reflecting off the ocean waves. Birds that live in and around cities can die because of sky glow, too. The bright lights can blind them, leading to countless collisions with buildings and other tall structures.

    On an individual level, people can help reduce much sky glow by using lighting only when necessary. The stars above us are priceless heritage— for not only for astronomers but for all humans. More of our children should be able to look up at night and see the Milk Way.

在相同条件下，取盐酸和醋酸溶液各100mL，与足量锌粉充分反应，若醋酸与锌反应放出的氢气多，则反应前（　　）

The hotel  (结合, 融合)comfort with convenience.

向500mLNaOH溶液中投入10.8g Al，二者恰好完全反应后，则参加反应的NaOH的物质的量为；原NaOH溶液的物质的量浓度为；生成标准状况下H₂的体积为．

阅读下面这首宋诗，完成下列小题。

祭常山回小猎

苏轼

青盖前头点皂旗，黄茅冈下出长围。

弄风骄马跑空立，趁兔苍鹰掠地飞。

回望白云生翠巘，归来红叶满征衣。

圣明若用西梁簿^① ， 白羽犹能效一挥。

【注释】①西梁簿：指晋将军谢艾，曾任西梁州主簿，本书生，善用兵，胜仗无数。

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。

删除：把多余的词用斜线(\)划掉。

修改：在错的词下画一横线，并在该词下面写出修改后的词。

注意：1)每处错误及其修改均仅限一词；

2)只允许修改10处，多者(从第11处起)不计分。

Dear Editor,

I'm the boy student in a key middle school in our city. I fond of play the piano. It is known by us that the college entrance examination is approaching. I must get good prepared for it. So I have only fifteen minutes to play the piano on every day. I don't want to give up my favorite, and my parents forbade me to continue playing it. They think it a waste of time to do it now. How do you think of it? Could you give me some advices on how to deal with the problem? I am looking forward to your early reply.

Thank you.

John

阅读下面材料，完成写作。

董卿在《朗读者》中说：“世间的一切都是遇见。就像冷遇见暖，有了雨；春遇见冬，有了岁月；天遇见地，有了永恒；人遇见人，就有了生命。”想必大家在语文课上也遇到了一些印象深刻的人物或文学形象，肯定也有很多想说的话。

请给其中一位人物或文学形象写一封信，说说你的心里话。

可选人物：李白、杜甫、苏轼、白居易

可选形象：小通讯员、新媳妇、香雪、琵琶女

要求符合书信格式，题目自拟，不得抄袭，字数不少于800字。

有NaCl、CaCl₂、AlCl₃三种溶液，分别与足量的AgNO₃溶液反应：①若所含溶质的物质的量相等，则生成沉淀的物质的量之比是；②若生成沉淀的质量相等，则三种溶液中所含溶质的物质的量之比是．

三鹿奶粉事件震惊全国,导致了中国奶制品行业危机,其起因是掺假者为了提高奶制品中蛋白质含量而加入了化工原料三聚氰胺(C₃N₆H₆),严重损害了人们的身体健康.测定牛奶中蛋白质含量常用盖达尔法:蛋白质 硫酸铵 氨,如图所示为某一牛奶的营养成分表,现取30mL牛奶用盖达尔法分解蛋白质,把氮全部转化为氨,用50mL0.5mol/L的H₂SO₄吸收,剩余的酸用1mol/LNaOH溶液中和,需38mL.

镁和铝的碱式碳酸盐是中和胃酸药物的主要成分。欲测定某种镁和铝的碱式碳酸盐的成分进行了以下实验，根据以下实验记录，回答下列问题：

在历史画卷之中，有无数英雄人物留下了浓墨重彩的一笔，他们或有其鲜明的个性，或有其突出的贡献。请仿照下面的示例，从烛之武、荆轲、刘和珍等本学期学习过的人物中，任选两位，为他们分别写一副对联。要求：符合人物形象，与示例格式一致。

示例：项羽——数杯酒忘刺杀初衷，一场宴搅天下大局。

下列化学用语正确的是（   ）

这座图书馆是个大建筑,位于市中心。

The library is a big building,.