今年春节期间,以毕业的学生到高老师家做客,高老师用一种方法给大家分糖,她手里拿着一盘糖,让第一个同学先拿一块糖,再把盘里

Hello,Mr.our family want to visit Beijing this winter.Please help us arrange it.We like Beijing because there are many places of interest,which have attracted so many foreigners.We also want to get a knowledge of the culture of the old Beijing.For example ,the history of Wangfujing and the Heaver Temple.In addition ,we want to taste some delicious food and visit hutong .We want to go there by plane and we will stay there for a week.I would appreciate it if you can arrange it and make us satisfied.

(1) 春节后体重为 60*（1+10%）=66kg
锻炼后体重为 66 / (1-10%) =59.4kg
所以磊磊轻了
(2) 64/(1+60%)=40人

删除“210辆消防车、”

考查病句的修改。修改病句的前提是正确辨识。“放弃休假”不能与“消防车”搭配，顾此失彼。

365÷7=52.1
星期二.加一天就行.

既然孝顺为什么不自己写呢?你如果爱你的亲人就应该自己写作文其实一点都不难今年我也留了一篇作文与你写的一样自己认真想总会想出来的.

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唐朝诗人戴叔伦诗：除夕夜宿石头驿
旅馆谁相问,
寒灯独可亲.
一年将尽夜,
万里未归人.
寥落悲前亊,
支离笑此身.
愁颜与衰鬓,
明年又逢春.

偏正短语.
书上错了.只有“今天国庆节”、“下周黄金周”之类的短语才是主谓短语,所以,若改成“今天春节”就是主谓短语了.可能是原来设计的是“今天春节”,后来弄错了.

This Spring Festival,many people visited my family,some of which we haven't seen for years.Now,it's a true family reunion.however,there will be a long period for the next family reunion.

解题思路：钟面上1～12个数字之和是78，在某些数字前添上负号，要使钟面上所有数字之和等于0，只能是正数之和是39，因此首先找到和等于39的数字后，在其它数字之前加上负号，就可以所有数字之和等于0．

根据题意列得：-1-2-3-4-5+6-7-8-9+10+11+12=0；
-1-2-3-4-5-6+7-8+9-10+11+12=0；
-1-2-3-4-5-6-7+8+9+10-11+12=0．

点评：
本题考点： 有理数的加减混合运算．

考点点评： 此题考查了有理数的加减混合运算，弄清题意是解本题的关键．

2010年春晚终于落下了帷幕,确切的说,非要加个定语的话,我个人觉得是骂声……[br/]当然,值得欣慰的是今年的春晚确实一改往日城乡结合部的服装造型,确实能看出在服装、尤其是舞台效果上下足了功夫,让人眼前一亮,延续了...

2010年元旦有月食,具体请见我的文章转载

解题思路：融雪剂样品加水溶解得到无色溶液，可以判断样品中一定没有硫酸铜，因为硫酸铜溶液为蓝色；向无色溶液中加入氢氧化钠溶液可以得到白色沉淀，说明样品中一定含有氯化镁，因为只有氯化镁可以和氢氧化钠反应生成氢氧化镁白色沉淀；同时可以判断无色溶液的溶质一定有氯化钠，则加入硝酸银后产生的白色沉淀一定是氯化银了．
通过题目中的实验无法确定是否含有氯化钠和硝酸钠，这两种物质就是可能含有了．

由题意可知融雪剂样品中可能含有的物质为：氯化钠、氯化镁、硫酸铜、硝酸钠中的两种或两种以上．结合实验分析这四种物质：硫酸铜溶液为蓝色；氯化镁可以和氢氧化钠发生反应生成白色沉淀氢氧化镁和氯化钠；氯化钠和硝酸钠不能与氢氧化钠反应．可以得出判断：样品中一定没有硫酸铜，一定含有氯化镁，可能含有氯化钠和硝酸钠．
由于氯化镁和氢氧化钠反应生成氯化钠，加入硝酸银溶液后生成的白色沉淀一定是氯化银．
故答案为：
（1）硫酸铜；氯化镁；氯化钠和硝酸钠．
（2）MgCl₂+2NaOH═Mg（OH）₂↓+2NaCl；AgCl．

点评：
本题考点： 实验探究物质的组成成分以及含量；常用盐的用途；常见离子的检验方法及现象；书写化学方程式、文字表达式、电离方程式．

考点点评： 解答通过实验判断物质组成的题目时，一定要抓住各物质的特性．比如颜色变化、产生沉淀、生成气体等，然后实验中每一步的现象做出正确判断．

A

解题思路：钟面上1～12个数字之和是78，在某些数字前添上负号，要使钟面上所有数字之和等于0，只能是正数之和是39，因此首先找到和等于39的数字后，在其它数字之前加上负号，就可以所有数字之和等于0．

根据题意列得：-1-2-3-4-5+6-7-8-9+10+11+12=0；
-1-2-3-4-5-6+7-8+9-10+11+12=0；
-1-2-3-4-5-6-7+8+9+10-11+12=0．

点评：
本题考点： 有理数的加减混合运算．

考点点评： 此题考查了有理数的加减混合运算，弄清题意是解本题的关键．

（1）CdCl ₂ ＋2NaOH＝Cd(OH) ₂ ↓＋2NaCl（2）②④（3）CD

：（1）根据反应物和生成物写出反应化学方程式为；（1）CdCl ₂ ＋2NaOH＝Cd(OH) ₂ ↓＋2NaCl（2）不任意捧、排放工业废水和生活污水经过净化处理后再排放不会污染水资源；而抑制水中所有动、植物的生长和大量使用化肥农药会污染水资源，故选：②④；
（3）在常温、常压下，水可以结成冰，称为“热冰”，所以“热冰”有许多实用价值，如开发新药、用于纳米打印机等，还可能用来在室温下制作冰雕以及建室温溜冰场．故选：CD

the first:this Spring Festival

今年春节我最孝在那过去的一年里，爸爸妈妈为我付出了很多。但我觉得，姥姥为我付出的更多，因为我常年住在姥姥家，所以妈妈关心我，也常回姥姥家。帮姥姥做这做那。例如洗洗衣服，打扫打扫家之类的家务活。每当我看到姥姥和妈妈这么辛苦时就想，她们这么累还不是为了我有一个很好的学习环境吗。所以我特别感激姥姥和妈妈。因此我今天想为我亲爱的姥姥和妈妈洗回脚，做些力所能及的事情。吃完年夜饭，我去厨房端了一盆水放在沙发前，把姥姥拉过来说，您坐下，辛苦了一年了。就让我来帮您洗洗脚，水我已经调好了。您看看合适不？姥姥高兴的看了我一眼，摸着我的头说，我们小羽长大了啊，会关心姥姥了。姥姥没白疼你啊。我说，那当然了。因为我又长一岁了啊。说着，我拿起姥姥的脚，轻轻的放在盆中。您先泡会。等等舒服了我给您洗。听到我这话。姥姥劳累了一生的脸上顿时绽开了一朵美丽的菊花。她连声说到；好好。姥姥叫着妈妈的名字，看来我们的小羽真的懂事了啊。我觉的今年是最快乐的一年了。哎，我洗着姥姥的脚；摸着姥姥长满厚茧的足底。心里不禁的想到；我们的长辈是多么的劳累，又是多么的容易满足啊。他们付出了那么多，所要的竟然仅仅只是儿女们的一丝的关怀。我以后一定会好好孝敬姥姥的。给姥姥洗完脚之后，我又去厨房打了一盆水，把妈妈的脚也仔仔细细的洗了一遍。妈妈也很高兴，连声夸我长大懂事了。洗完脚之后，我们一起坐在电视机旁看春节联欢晚会。姥姥和妈妈今天都笑的特别的开心。我看着她们那开心的笑容，心里暗暗的发誓，妈妈，姥姥。我爱你们。我会让你们以后每天都像这样，开开心心，快快乐乐。我没有什么能孝敬您的。我只能好好的学习，在新的一年里以优异的成绩实现你们对我的期望，报答你们对我的抚育之恩。我爱你们！要说今年谁最高兴，那就是妈妈和姥姥了。她们为什么高兴呢——那就是我的孝顺了，你们说呢？

要说今年春节谁最孝敬父母，我觉得其他人都比不上我，我一定会是春节最孝敬父母的人，因为今天一天时间我都在帮父母对我们家的这栋七层楼进行一次大扫除。我们一家人根据年龄大小来分配个人的工作，我被分配到了擦楼梯扶手，但由于太脏了再加上有很多死角。我擦了半天才擦得一点点，再看一下我的毛巾“哇”我吓出一身冷汗，原来干净的毛巾现在已经黑不溜秋，我连忙跑去洗毛巾，我洗完回来又开始继续擦。我左手拿着毛巾右手抓住扶手，然后使劲地擦，我不停地擦了半个多小时，虽然时间长，可我才擦得一层，而且现在我已经腰酸背痛脚抽筋，这时我才知道这活那么难，我想：那么难啊，都搞得我腰酸背痛了。不搞了，不搞了。就在我要走的时侯，突然想到：如果我不搞了，爸爸妈妈又要搞，我现在擦都见麻烦，何况爸爸妈妈的年纪也有点大，擦起来应该会很吃力。想到这我又想到了老师说的话“父母的爱是无价的，父母的爱是无法形容的，我们一辈子都还不清，这么点活和母爱相比算什么呢”于是我又继续擦，经过我一个上午的努力，终于擦完了。下午我又擦墙，虽然很累，但我很开心，因为我是在孝敬父母。帮他们干活。经过这一天的劳动，我把家里打扫得干干净净，我看着心里美滋滋的，因为我又为父母做了一件好事，这也算是我对父母的一种孝敬吧。

D

解题思路：我们运用本金乘以利率乘以时间就是利息，再用利息乘以（1-5%），得到的积就是税后利息．

2000×5.40%×3×（1-5%），
=108×3×0.95，
=324×0.95，
=307.8（元）；
故应选：C．

点评：
本题考点： 存款利息与纳税相关问题．

考点点评： 本题运用“本金×利率×时间×（1-5%）=税后利息”进行解答即可．

Dear David,Welcome to our city.I'm happy to hear that you will come to see me in Spring Festival .In winter ,the weather is cold in our city.So you must prepare some clothes.For example,you should wea...

要说今年春节谁最孝敬父母，我觉得其他人都比不上我，我一定会是春节最孝敬父母的人，因为今天一天时间我都在帮父母对我们家的这栋七层楼进行一次大扫除。
我们一家人根据年龄大小来分配个人的工作，我被分配到了擦楼梯扶手，但由于太脏了再加上有很多死角。我擦了半天才擦得一点点，再看一下我的毛巾“哇”我吓出一身冷汗，原来干净的毛巾现在已经黑不溜秋，我连忙跑去洗毛巾，我洗完回来又开始继续擦。我左手拿着毛巾右手抓住扶手，然后使劲地擦，我不停地擦了半个多小时，虽然时间长，可我才擦得一层，而且现在我已经腰酸背痛脚抽筋，这时我才知道这活那么难，我想：那么难啊，都搞得我腰酸背痛了。不搞了，不搞了。就在我要走的时侯，突然想到：如果我不搞了，爸爸妈妈又要搞，我现在擦都见麻烦，何况爸爸妈妈的年纪也有点大，擦起来应该会很吃力。想到这我又想到了老师说的话“父母的爱是无价的，父母的爱是无法形容的，我们一辈子都还不清，这么点活和母爱相比算什么呢”于是我又继续擦，经过我一个上午的努力，终于擦完了。下午我又擦墙，虽然很累，但我很开心，因为我是在孝敬父母。帮他们干活。经过这一天的劳动，我把家里打扫得干干净净，我看着心里美滋滋的，因为我又为父母做了一件好事，这也算是我对父母的一种孝敬吧。

⑴参加活动的人均次数为
⑵
⑶ 的分布列



本试题主要是考查了条形图的运用，以及古典概型概率的运算，和分布列的求解和数学期望值的综合运用。
（1）由图可知，参加活动1次、2次和3次的学生人数分别10、50和40.
⑴该合唱团学生参加活动的人均次数为
（2）从合唱团中任选两名学生，他们参加活动次数恰好相等的概率为
（3）从合唱团中任选两名学生，记“这两人中一人参加1次活动，另一人参加2次活动”为事件A，“这两人中一人参加2次活动，另一人参加3次”为事件B，“这两人中一人参加1次活动，另一人参加3次活动”为事件C，那么容易知道各个取值的概率值，进而得到分布列。
由图可知，参加活动1次、2次和3次的学生人数分别10、50和40.
⑴该合唱团学生参加活动的人均次数为 ……………（2分）
⑵从合唱团中任选两名学生，他们参加活动次数恰好相等的概率为 ………（4分）
⑶从合唱团中任选两名学生，记“这两人中一人参加1次活动，另一人参加2次活动”为事件A，“这两人中一人参加2次活动，另一人参加3次”为事件B，“这两人中一人参加1次活动，另一人参加3次活动”为事件C。 易知 ………（6分） …………（8分） ……………（10分）
的分布列

的数学期望： ………………………（14分）

小明收到320元压岁钱,

解题思路：温度计在读数时应先明确其分度值，再根其温度的延伸方向进行数格．判断温度计中的液体是什么，应通过观察温度计的测量范围，与表中所列液体的凝固点、沸点进行比较来确定．

（1）图中温度计的分度值为2℃，能测量的最低温度是-40℃，最高温度是50℃，故量程为-40℃～50℃；
（2）液柱位置在零摄氏度以下，位于-10以下第3个小格，故其示数为-16℃；
（3）通过观察温度计的测量范围，并比较表中的数据可知，酒精的沸点为78℃，大于温度计的最大测量值，凝固点为-117℃，小于温度计的最低温度，而水和水银的凝固点都大于温度计的最低温度，因此温度计内的液体是酒精．
故答案为：-40℃～50℃；-16；水银．

点评：
本题考点： 温度计的使用及其读数．

考点点评： 读取温度计的示数是我们应该掌握的一项基本技能．温度计内的液体的选择是有一定要求的，因为如果温度计的液体本身沸腾或凝固了以后，就无法再测出相应的温度了．

由图可知，参加活动1次、2次和3次的学生人数分别为10、50和40。
（1）该合唱团学生参加活动的人均次数为
。
（2）从合唱团中任选两名学生，他们参加活动次数恰好相等的概率为
。
（3）从合唱团中任选两名学生，记“这两人中一人参加1次活动，另一人参加2次活动”为事件A，“这两人中一人参加2次活动，另一人参加3次活动”为事件B，“这两人中一人参加1次活动，另一人参加3次活动”为事件C，易知


的分布列：

的数学期望： 。

第一户,有三种选择.
第二户,有二种选择.
第三户,有一种选择.
总共有3*2*1=6种.

2013年元宵（正月十五）,公历为2月24日,星期天.

解题思路：设小明现在的年龄为x岁，则奶奶现在的年龄为5x岁，等量关系为：5年后奶奶的年龄=5年后小明的年龄×4，依此列出方程求解即可．

设小明现在的年龄为x岁，则奶奶现在的年龄为5x岁，根据题得，
4（x+5）=5x+5，
解得：x=15，
经检验，符合题意，5x=15×5=75（岁）．
答：奶奶现在的年龄为75岁．

点评：
本题考点： 一元一次方程的应用

考点点评： 本题考查了一元一次方程的应用，解题关键是要读懂题目的意思，根据题目给出的条件，找出合适的等量关系列出方程，再求解．

将假期作业认真完成.
做环保小卫士,动员父母不燃放烟花鞭炮,爱护环境.
每天抽出一个小时的时间进行锻炼身体.
做几个有纪念意义的小礼物送给自己最亲最爱的亲人和朋友.
帮助爸爸妈妈做些力所能及的家务活.
新问题请重新发帖提问,

星期六

小弟,我这次可以帮你找,不过我希望你以后能自己按时完成作业,完成作业是学习中很重要的环节!请牢记!
January 13 2010
It was the first day of our winter holiday. All of us were very happy. Why? Because we have one months to do things we love to do. We are free. Although we have some homework. But we can finish them in several days. And the rest time we can make good use of. My god! We have been very tired after hard studying. In winter holidays, I want to have full sleep and eat good food in order to replenish myself. Last but not the least, I will have a good rest.
January 14 2010 中学生寒假英语日记范文
It was the second day of our winter holiday. I felt good. I felt I’m free. I had a lot of time to do things I like. My parents are in Beijing. So I live alone but I don’t feel lonely. But I didn’t do something special. I stayed at home and watched TV. Oh! I wrote an English daily composition. It was my homework. Today, I have slept for 14 hours. I thought I was very tired. It was time for dinner. I must go! I am very hungry.
January 15 2010
It was the third day of our winter holiday. Today, there are many business in my mother’s company. So my mother told me to help my uncle who is the manager of my mother’s company. I sat in my mother’s office and help her answer the telephone. While I was free, I was writing my homework. Although I also have a lot of time to do my homework, I still do it. Because in my mother’s office, I had nothing to do. If I did nothing, I was wasting my time and my life. I can’t do the foolish thing. We should take good use of our time.
January 16 2010
It is a special day today. My mother sent one hundred basket of red bayberries. I like to eat red bayberries. It tastes nice. When they arrived in Shanghai, they were still fresh. But most of them would be sent to my mother’s business friends. I chose the best basket of red bayberries to eat. I put the rest in my refrigerator. Red bayberry is my hometown’s special product. It is well-known in china. Many people like to eat it.
January 17 2010
Today, I still went to my mother’s office. My mother was very busy, so was my father. They always live in Beijing. They must get up early. Because they will manage the factory. So I know they are very laborious. So I should save my money. Also I should help them. Although I can’t do something useful, but I think I should share the work with them. I am one of my family member. In the future, I will take a job and work. It’ time for me to begin to learn how to work.
January 18 2010
I have rested for a week. I began to feel bored. So I went out with my friends. They are my best friends in the middle school. We didn’t go to someplace special. We just saw the other. We had lunch together. While we were having lunch, we were still talking about the new school and new friends. Yes! A year later, we have grown riper. And we learned much more things and got new life. We haven’t enough time to play, to waste and to lose the way. We only have two years. Two years to go, we will get the real life which belongs to us.
January 19 2010
I have stayed in Shanghai alone for a week. It’s time for me to go to my real home—it is in Beijing. My parents are waiting for me. Although outside is no matter how beautiful, Beijing is still my home. In fact, there is many fresh things. Like red bayberries. In the afternoon, I took a bus to Beijing. I was very unlucky that my mp3 was stolen. I was very sad. I didn’t know why thieves went to steal other’s things. Why don’t they hunt for a job? I don’t why! I hope there is no thief in our motherland.
January 20 2010
When I got home, it was very dark. Why? There is no electric. Every year in Beijing, there is lack of electric to supply. Because there are a lot of factories. And it is very cold in winter. So the government decided: supply electric to resident and the factories must stop working. My house is in the manufacturing district. I was unlucky. It was very cold. So my father use the electric making machine to make electric. Oh! What a unlucky winter!
January 21 2010
It was cooler than yesterday. One of my father’s friends invited me to eat red bayberries. You must know it is unusual. Because we will climb the hill to eat red bayberries. There is no chance to eat red bayberries in the hill for the people who don’t live in Beijing. On the hill, you can breathe the fresh air, you can listen birds singing and you can eat red bayberries. It was enjoyable. It is said there are wild pigs in the hill. What a beautiful natural.
January 22 2010
Today I found time was a cruel thing. Whatever man is, time always goes on. It won’t stay to wait for somebody. You can’t use anything to exchange time. Time is also a fair thing. Although you have a lot of money or you enjoy high reputation, time won’t leave them more. Today I found I hadn’t enough time. Although I have 50-day holiday, but I found I had a lot of things to do. I had a lot of homework to do and I had something necessary to do.
January 23 2010
I have rested for 10 days. In these days, I felt very bored. I didn’t know to do what. Although I had a lot of things to do, I felt uncomfortable. I was ill because of the cold weather. I was tired, sleepy and had no strength. My parents are worried about my health. in fact, it didn’t matter. I was always in the room with air-conditioner and opened it in a low temperature. So when I went out, the high temperature disagreed to me. Finally, I was ill.
January 24 2010
Today, when I awaked up, I found the air-conditioner didn’t work. I used the control, but it still didn’t work. I knew the air-conditioner was in trouble. I went downstairs. My father told me two air-conditioner and two computer had been broken. Because my father used electric making machine to make electric, so the voltage was not stable. It led to the trouble. Oh! Whenever the government will let the factory use electric? If it lasts longer, I will be crazy!
中学生寒假英语日记范文
January 25 2010
It doesn’t matter that the air-conditioner has been broken. But my notebook-computer also was broken. I really don’t know what to do. So I went to play basketball. I didn’t know any one in that place. And I was the first time to go there to play basketball. At first, there was no person playing basketball. So I played basketball alone. A few minutes later, some students came to play. So we played together. Of course, we had a match. And It lasts two hours. After the match, I felt I would be dead. I was too tired.
January 25 2010
No computer, I will not know to do what. I have no solution to the problem. So I sent my notebook-computer to the Asus computer company. I must have my computer repaired. And the other one, it was thoroughly broken. It can’t be repaired again.The computer company told me that my notebook computer needed one week to repair. The electric led to all trouble. And many electrical appliances are broken. I don’t know when our country can solve the problem.
January 26 2010
I have lost two computers, but I had another one. I bought it about five years ago. It can be called curio. Though it was old. But it can still work. Although it works slowly, I was pleased. I can go on internet again. Chatting with my friends is a good relaxing. In the internet, one of my old friends invited me to tomorrow’s party. He told me that some friends would go, too. So I promised to go. A-ha! I can see my old friends. I was very happy and hopeful.
January 27 2010
It was sunny today. I was excited. I got up at a quarter to seven. I made a appointment to meet at nine o’clock. After I had my breakfast, I went to the city center of Beijing. It was cold outside. When I arrived, my friends didn’t arrive. I waited for him in front of the KFC’s door. I haven’t seen them for a year. And in a year, we didn’t come into contact with others frequently. About ten minutes left, my friends arrived one by one. After we greeted, we went to the 5-star restaurant to have lunch. The lunch cost us 800 yuan. Oh, dear! They were all very rich, and one was poor.
January 28 2010
Yesterday we played happily, but there were only ten people. I remembered last year there were twenty-two people at all. I heard some my friends had gone abroad. They went abroad to study. Maybe I couldn’t see them in the future. I think next year we won’t make a party. Next year is a very important year. We all will prepare for the college entrance examination. It is the most important for us now.
January 29 2010 中学生寒假英语日记范文
I was bored. So I wanted to travel to Hong Kang. I told my father my decision. To my surprise, my father agreed. My father thought I always at home was bad. He thought I should go out to see our country clearly. How beautiful our country is! My father drove me a travel service. I filled out an application form. After that, the agency would finish every things. At last the agency told me it would take a week time to transact procedures.
January 30 2010
The screen of my father’s mobile telephone is broken. When you open the mobile telephone, the screen is always white with light. You can’t see from the screen. And my father is a businessman. He needed a new one. So my father and I went to the electrical appliance shop. There are many new kinds of mobile telephones. At first, my father chose a Sumsung one. But all the telephones have sold out. Finally, my father chose a Motorola one.
January 31 2010
The food in Shanghai disagree me. I think the food in Beijing is the most delicious. Seafood in Beijing is very fresh. Prawns in restaurant are all alive. And there are many food that you can’t see in other cities. It is very cheap that you eat seafood in Beijing. The less money you pay, the more enjoyable you are. Maybe my stomach is ill. Whatever food I eat, I am still thin. And I am too thin, I want to be a litter fatter. So I must eat more.
February 1 2010
My dog will be dead. She is very old. We have kept her for ten years. Now her hairs are falling. And she always lies on the ground. She can’t see very clearly. She eats a little. She becomes thin. She was very strong before. She is still guarding my family. She is one of my family member. Now we are all uneasy because she will die. I think you may know my thinking. Even if it is a dog, you can’t forget it. So these days, we feet her the best food.
可能不够30篇 剩下的自己模仿也能锻炼

C 水凝固
冻雨就是雨水落地结冰,也就是水凝固

改正如下：
今年春节,我们全家十二口人从四面八方凑在了一起,老老少少都特别高兴.吃年夜饭时,大家一起举杯祝愿全家幸福,安康.

设成人票x张；小孩票10-x张.
20x+12*(10-x）=168
20x+120-12x=168
8x=48
x=6
10-x=4
所以,大人票6张；小孩票4张.

D.使用氯化钠融雪,对公路周围农作物的生长无影响

车和放弃休假不能搭配,把120辆消防车删掉

今年春节期间,这个市的3000多名消防官兵,放弃休假,始终坚守在各自值勤的岗位上.
消防车不能说是放弃休假

设这个密码为200000+x,则
10x+2＝3×（200000+x）+4004
解之,x＝85142
所以,这个密码为285142

（1）图中温度计的分度值为2℃，能测量的最低温度是-40℃，最高温度是50℃，故量程为-40℃～50℃；
（2）液柱位置在零摄氏度以下，位于-10以下第3个小格，故其示数为-16℃；
（3）通过观察温度计的测量范围，并比较表中的数据可知，酒精的沸点为78℃，大于温度计的最大测量值，凝固点为-117℃，小于温度计的最低温度，而水和水银的凝固点都大于温度计的最低温度，因此温度计内的液体是酒精．
故答案为：-40℃～50℃；-16；水银．

看那烟火满天
“爆竹声中一岁除,春风送暖入屠苏,千门万户瞳瞳日,总把新桃换旧符”.春节的景象早在几百年前的大诗人王安石眼里便是如此和谐美好,而在二十一世纪的今天,更是生机盎然.在春节这个传统佳节里,最靓丽的风景线便是夜空中绚丽灿烂的烟花了.
大年三十的午夜12点,烟花绝对是空中的主角儿.我倘佯在人流之中,频频仰起脸庞欣赏烟花的姹紫嫣红.你瞧!这烟花,一朵、两朵、三朵,“噌”的一下飞上了空中,绚丽多彩的烟花在天空中一点点绽放开来,满心的欢喜在人们心底一点点荡漾开来；这烟花,一出匣,像一条条腾空而飞的火龙,呼啸着,奔向天空,焕发了一刹那的灿烂；这烟花,又仿佛是千万朵鲜花,绽开在半空,伸展出袅娜的舞姿;这烟花像一个魔术师,用它神奇的魔杖在夜空划出一道闪光的轨迹这千姿万态的烟花,摇曳多彩,煞是好看.
你再瞧!这满天的烟花,有红的,蓝的,黄的,绿的,白的.它们落下的“花瓣”好像流星一样划过,消失在天空,将夜幕点缀的如同百花园般千姿百态.既像一个个绣花球,团花簇锦似的在空中荡漾着.又像一个个降落伞携带着上帝的赐赠,从天而降.这满天的烟花,有的像菊花,有的像绒球,有的像海棠.现在“美丽”这个词已经不足以形容了.他们仿佛像清丽可人的仙女有的臂挎花篮,采摘鲜花；有的怀抱琵琶,轻拨银弦；有的倒悬身子,自天而降；有的彩带飘浮,漫天遨游；有的舒展双臂,翩翩起舞,有的脚踩白云,飘飘欲仙.难道不就是一幅丹青难描的"仙女散花"图吗?
虽然烟花一闪而逝,但它已把美丽深深地植入人们的心中,带给人们由衷的赞叹和无限的遐想.望着这半空中的烟花,我不由陷入了沉思:那每一朵放飞的烟花,不正是人们向明天放飞一个美好的祝福吗?
啊,这美丽的烟花之夜!

2000×3.33％×3＝199.8元

将假期作业认真完成.
做环保小卫士,动员父母不燃放烟花鞭炮,爱护环境.
每天抽出一个小时的时间进行锻炼身体.
做几个有纪念意义的小礼物送给自己最亲最爱的亲人和朋友.
帮助爸爸妈妈做些力所能及的家务活.

The Greens ARE PLANNING FOR a trip to Beijing. are planning to make are going to have

A

解题思路：根据氯化钠溶液与水比较，其沸点升高，而凝固点降低；工业食盐中含有亚硝酸钠有毒进行分析解答本题．

根据氯化钠溶液与水比较，其沸点升高，而凝固点降低；金属材料在盐溶液中锈蚀速度大大加快；工业食盐中含有亚硝酸钠，外观与氯化钠相似，有毒性，故答案为：稀溶液的凝固点较低；盐溶液会加速铁的生锈；NaNO₂．

点评：
本题考点： 氯化钠与粗盐提纯；金属锈蚀的条件及其防护；常见中毒途径及预防方法．

考点点评： 本题考查学生对工业食盐的认识，能做融雪剂，但有一定的危害，与环境保护相联系．

少用一次性筷子、碗，不用塑料袋

第一题楼上已解决 第二题：设中途某处到出发的距离x. 则有：（90-x）/4=(90+x)/60 解得：x=78.75 路程解到了,速度知道了,时间问题不就解决了么