前不久,“奋进号”航天飞机进行了一次太空飞行,主要任务是给国际空间站运送物资和给国际空间站安装新的太阳能电池板.该太阳能

不唯一
Something Special for Parents
Not long ago,Student Union in our school advocated that Senior Three students should do something special for their parents on their 18 ^th birthday. All the students were actively in response to it and most of them have come up with their ideas. Some choose to write a letter,saying it’s the best way to express their appreciation as well as love for their dearest parants. Others prefer to cook a big meal to show that they’ve already grown up.
As for me, I tend to do up hair,wash feet and cut fingernails for my parents. By doing what my parents have been doing for me I can really know how much they devote to bringing me up. Also, being eighteen years old means it’s time that I should take responsibility to take care of them.

（1）保险箱受到水的浮力：
F _浮 =ρ _水 gv _排 =1.0×10 ³ kg/m ³ ×10N/kg×0.02m ³ =200N，
∵F _浮 +F _拉 =G，
∴绳子的拉力：F _拉 =G-F _浮 =500N-200N=300N；
（2）保险箱上升的速度：v=
s
t =
10m
50s =0.2m/s；
（3）拉力做功：W=F _拉 s=300N×10m=3000J．
答：（1）保险箱受到水的浮力和绳子的拉力各为200N、300N；
（2）保险箱上升的速度为0.2m/s；
（3）拉力做了3000J的功．

Mr Nunan,
Recently I have had a discussion about the ways to learn English better with Allen, a student from Britain. In his opinion, the best ways are reading English newspapers and talking with friends. He also believes that sometimes seeing English films isn‘t a bad way.
I quite agree with him. However, I think, we can go surfing online, where we can find a lot of information in English to read. Besides, we can look for an e-pal from an English-speaking country so that we can get to know something about his or her country. Finally, learning English grammar well is also a great help.
Yours sincerely,
Liu Mei

1 给父母买个电暖气送去,现在停止供暖了,父母家里冷.
2 常回家看看,带去父母爱吃的东西.
3 常打电话询问父母的近况,陪父母话家常.
4 天暖的时候,带父母出去玩.

是的,所有的日食都发生在农历月底月初,即新月时段.
这个时段,月球处于太阳和地球之间,具备了发生日食的基本条件；如果三者正好运行到了同一条直线上,那必然发生日食,月球离地球远一点的是日环食,离地球近一点的可能就是日全食,如果月球稍稍偏离了一点地球跟太阳的连线,即发生日偏食.

解题思路：灭火的方法有：（1）与空气（或氧气）隔绝．（2）降温到可燃物的着火点以下．（3）撤走可燃物．

使用风力灭火机强力灭火的原理是：空气流动时带走热量，从而使得温度降低到可燃物的着火点以下，达到灭火的目的．故填：降低温度到可燃物着火点以下．
砍伐部分树木打防火用离带的灭火原理是：使可燃物与火源隔离，从而达到灭火的目的．故填：清除或隔离可燃物．

点评：
本题考点： 灭火的原理和方法．

考点点评： 解答本题要充分理解各种灭火的原理方面的知识，只有这样才能对相关方面的问题做出正确的判断．

Not long ago, you and from The United States, a high school students with Allen's sport in discussion of a topic: exactly The t

解题思路：凸透镜在成实像时，物距变化，像距也变化，像的大小也跟着变化，具体规律为：“物近像远像变大”．

根据“物近像远像变大”“物远像近像变小”，小丽同学在学校拍摄浠水一中科技楼的全景照片时，发现镜头中只有科技楼的一部分，在拍摄全景时，必须使像变小，必须减小像距，增大物距，即将照相机远离科技楼，同时将底片像靠近镜头的方向移动．
故选D．

点评：
本题考点： 凸透镜成像的应用．

考点点评： 凸透镜成实像时，满足“物近像远像变大”；成虚像时，满足“物近像近像变小”．

BD

：在他减速下降高度为h的过程中，重力做功mgh，他的重力势能减少了mgh，他的机械能减少了 Fh，选项BD正确AC错误。

帝度冰箱的“云保鲜”技术本质上是给储存的食物一个清新无菌的环境.在帝度冰箱内部的右上方会配置空气净化块,箱内的空气流经净化系统,就快速吸附细菌,铂金离子和银离子共同对细菌进行快速分解,从而达到除菌保鲜效果.

这不是谦虚的表现，是一种自卑心理。自卑的人轻视自己，往往看不到自己的能力，即使可以做得很好，也不敢尝试。罗美就是这种心理，她渴望当这个课代表或出黑板报，可是对自己能否干好没有把握，就放弃了实践自己、展示自我的机会，这不是谦虚，这是没有自信心的表现，是自卑心理。

全文翻译如下：
Hello! Good morning to you today, I Duty! You like the World Formula One Championship? I am a Racing Fans, like F1. .2007 In F1 recently stations in Brazil in the season came to a close. Closely watched the first Ferrari driver to win Lecklin delivered the annual championship. Favorite and won before the British nationality but McLaren driver Hamilton Station in China and Brazil encountered in skidded off the station track doom, and make our own championship twice and lost! And I am even more optimistic about before the McLaren's Spanish driver Alonso has poor state, in China and Brazil stations failed to put in play, ultimately, ranks No. 3.
Lecklin win and the biggest hero is Brazilian Ferrari driver Felipe Massa, Brazil in the first qualifying he won pole position in the tournament, he is tangent to accelerate the success of the first stop Hamilton the grid so that the success of the first team Lecklin beyond McLaren driver Hamilton, and in the back of their first game will give the Lecklin, Lecklin points to a win by Chinese Mill Dayton.
2007 Formula One is very exciting, but I am disappointed because I like the driver Alonso next season will leave McLaren, I do not know where he will go to, but I look forward to his next championship!

http://zhidao.baidu.com/question/545324637.html?bd_source_light=1550576

D

This short essay might be nothing to do with this topic. But still I want to write it up.
It's about my love story.
Not long ago I broke up with my girlfriend. We have been in love for 4 years. The love between us is exists all the way even now.
I couldn't sleep all night and I don't how long this will be. Past momeries has been illuminate by the moon. Represented by the dark nights. So i started suffering from this.
I have a lot of words to tell her, a lot of things to do. A lot of sights we havn't seen together. We broke up.
Sometimes, lots of things that we have to do to each other, the only thing left now is the habit. I cannot get her out of my mind. Later on I have realised that she is gone. So I serious realised that the feeling between us is not only a feeling.
All right then. Let those words out makes me feel better now. I don't care how many marks I am going to get. I am going to hand in this paper now .
~, 看到你的求助我没睡觉都帮你答啦嘿, 明天还有考试, 别不开心啦, ^^过去的总会过去的, have a nice day ~ x

Dear Tom
I am sorry to hear of that .If I were you ,what I would do is Give a call to that friend and ask him for coffee or hang out and explain the misunderstanding face to face .In addition,tell that friend that "I respect the relationship between us very much .I love to keep it forever" .
In future,if some misunderstanding happen between friends ,just explain to them immediately.
Your sincerely
LI HUA

The length of time in the spotlight can also be a determining factor, as the longer the person is examined in the media, the greater the possibility that damaging information will be discovered or that the individual will do something to disparage his or her reputation. But to broadly state that media scrutiny will diminish anyone's reputation is to overstate the distinct possibility that, given a long enough time and a certain level of intensity of coverage, the media may damage a person's reputation.

解题思路：

(1)当拉力最大时，h有最小值。对钢琴：F−mg=maa="0.4"m/s2

v2=−2ahh=0.45m(6分)(用动能定理同样得分)

(2)当减速时间为3s时：(3分)

(法一)(4分)

所以，钢琴机械能的机械能减少了1606.5J(2分)

(法二)(4分)

所以，钢琴机械能的机械能减少了1606.5J(2分)

（1）0.45m            (2) 1606.5J


<>

10 ³

答案C
（A项,语序不当.“阻力极其微弱”应与“空气极其稀薄”互换.B项,成分残缺.“给予”前加上“科学家们”.D项,成分赘余.应去掉“290美元以上”中的“以上”）

参考示例：
　　爱心捐款应是自觉自愿的，捐款的多少也要量力而行，不能攀比，更不能有虚荣心。在善心的天平上，捐款数额的大小是等价的。善良的爱心需要呵护和珍藏。因此，我认为捐款排名公布是不应该的。（意思对即可）

你过分的呵护与溺爱是害死它的‘罪魁祸首’,因为它没了选择的余地和自我调节的空间.野地里的花草,无论多么不好的年景,大都能靠自己顽强的求生欲望挺过来；而温室里的花木,只要温度、湿度有一点不合适,或许就会夭折.人也是一样,所谓‘宝剑锋从磨砺出,梅花香自苦寒来’!”

D

English composition If you are li hua, your pen Pal recently sent you a New Year gift He send an email to ask whether you received,
Report anonymously | | 13 minutes ago from mobile phones know | classification: foreign language learning

Dear friend,

I’m sorry to hear that you are too much interested in the Internet bars. That’s not right, although it can help us a lot in learning. But getting on-line is a waste of time and money and also affects your studies. It also does harm to your eyes and health. At the same time, it may harm you because there is something bad for the students. “Be away from Internet Bars” is the best choice for us young boys and girls of the new century. Don’t get on-line. Let’s stay away from Internet bars.

时光匆匆 光阴似箭 日月如梭

Dear Xiaoming,
I am glad reveiving your letter.following are the learning english ways and experience of me:
1.must listen ,read,speak,and write more.for example,everyday morning,listen the VOA.BBC or other english program,speak the practical english magzine or course,and usually speak other students who loved english at english corner or at daily life.everyday try to write one english article,it can be the content which contains the daily life,practice or other things happened or you see.it can promote your english greatly.
2.the experience of learning enlish is that you must be bold enough,and don't fear speaking with other guys even if you speak wrong.and the another suggestion is you must exercise everyday,and keep studing.can not Work by fits and starts.(三天打鱼,两天晒网）

Dear Nancy,
How are you getting along with your study these days?
We miss you very much. Firstly, I would like to say “thank you” for teaching us so well. With your help we have learned how to study English. We often recall the days when we stayed together having fun. Secondly, I want to share with you something that happened to me and my class. Two weeks before the New Year, my classmates and I prepared for the talent show for the New Year after school. Our performance was a big success as a result of our hard practice. Now we are employed in going over our lessons for the final exams. What’s more, I have planned to read two English novels during the winter holidays. What do you think of it? Could you tell me about your plan?
I’m looking forward to your early reply.

你好,你的这个短文50词左右太少,我写了比较多,你挑你喜欢的来摘抄一下吧.
Dear XiaoWei,
I'm glad to receive your letter.In your letter you asked me about how to learn English well.
My humble opinion follows:There's no shortcut to learn English,if you can put yourself in an all English-speaking environment you will command a very good spoken English in less than half a year.But if you can't get an environment like that you should make progress step by step.
下面是我的一孔之见：学习英语没有捷径的,除非你把自己放入一个全英语的环境中,那样你将会在半年左右的时间掌握不错的口语,如果你找不到这样的环境你只有一步一步来努力了.
Word is the foundation of learning English so you must start from word（I don't know your level）but I don't encourage you to learn by rote.单词是学习英语的基本功,所以你必须从单词开始（当然这要视你的水平而定）,但是我也不建议你死记硬背地记单词.
Here are some notes for you from my own experience:这是我个人经历中的一些要点：
1.English-learning should be integrated into daily lives. Not only learn English, but live in English also.
将英语真正融入日常生活!不要学英语,而要生活在英语当中!
2.Make some posters with those difficult words and sentences. Hang them in the most outstanding places at home. You will learn them subconsciously.
把难单词、难句子制作成海报,贴在家里最显眼的地方,不知不觉就掌握了!
3、Make English your greatest enjoyment,you'll feel uncomfortable once you don't read English.You even can't eat or sleep once you don't read English.
不读英语就难受!不读英语就“寝食难安”!让读英语变成“最大的爱好”!
4、The first thing after you open your eyes is speak English loudly.Shout out a day of vigor and brilliant! Shout out a day of full and success
睁开眼睛的第一件事就是“大声喊英语”!喊出一天的活力和辉煌!喊出一天的充实和成功! 5、Shout in English ten minutes before going to bed. Let English come into your subconsciousness. You still learn English when dreaming.
入睡前一定要大喊英语十分钟!让英语进入潜意识,做梦也在学英语.
6.Try to speak English out don't be afraid of making mistakes as a beginner.Mistake is inevitable you will deepen the impression and bear it in mind in order to make the same mistake again and you must make a progress from your mistake.试着讲英语,作为一个新手别怕犯错误,错误是难免的,当你犯错误后必须会加深你的印象从而不至于再犯同样的错误,同样你也会从中得到收获.
7.The word "more" is the key to learning English.If you want to learn English,more read more listening and more speaking more reading more writing is necessary.学好英语的关键就是"多",听说读写样样都得多练.
8.Exploit your self-potential and to your full capacity.The secret of success is consistency to purpose.Diligence is the biggest factor in success.
挖掘你的潜能,成功的秘诀就是持之以恒,勤勉是成功的最大决定性因素.　　　　　　　　　　　　　　　　　　　　　　　　　　　　 　　　Yours sincerely
XiaoZheng

目前,超强酸在化学和化学工业上,极有应用价值,它既是无机及有机的质子化试剂,又是活性极高的催化剂.过去很多在普通环境下极难实现或根本无法实现的化学反应在超强酸环境中.

（1）植物的夜色枯黄,他们选择施用 （氮）肥是正确的.x0d（2）前一段时间他们曾用熟石灰（Ca(OH)2 ）对花坛中的（酸）性土壤进行改良过.x0d（3）近一个星期一直无雨,气温较高.x0d（4）通过查阅资料,小亮和同学们知道：含NH4+的盐受热或与碱混合,会放出有刺激性气味的氨气,氨气的水溶液呈碱性.x0d【提出假设】x0d（1）太阳的暴晒,气温升高都可以使肥效流失,x0d（2）熟石灰与化肥反应也能使肥效流失.x0d【设计并进行试验】x0d（1）小亮取少量这种化肥置于试管中加热,并在试管口放一条干燥的PH试纸,试纸无变化.x0d（2）另取少量这种化肥与熟石灰混合,闻到（刺激性）气味.x0d【结论】由以上第二实验中的现象他能得出肥料流失与（熟石灰）有关.x0d【反思与应用】x0d（1）小亮进行的第一个实验中,PH试纸无变化,这与查阅资料给出的信息不符,其原因是（PH试纸没用用水浸湿）.

21：wenxin,rudong；
22：谨慎小心；
23：A；
24：C：
26：A

解题思路：（1）知道保险箱全浸没在水中，排开水的体积等于保险箱的体积，利用阿基米德原理求保险箱受到的浮力；而保险箱受到水的浮力加上绳子的拉力等于保险箱重，据此求绳子的拉力；
（2）知道保险箱上升的距离和时间，利用速度公式求上升速度；
（3）知道拉力大小和上升的距离，利用功的公式求拉力做功．

（1）保险箱受到水的浮力：
F_浮=ρ_水gv_排=1.0×10³kg/m³×10N/kg×0.02m³=200N，
∵F_浮+F_拉=G，
∴绳子的拉力：F_拉=G-F_浮=500N-200N=300N；
（2）保险箱上升的速度：v=[s/t]=[10m/50s]=0.2m/s；
（3）拉力做功：W=F_拉s=300N×10m=3000J．
答：（1）保险箱受到水的浮力和绳子的拉力各为200N、300N；
（2）保险箱上升的速度为0.2m/s；
（3）拉力做了3000J的功．

点评：
本题考点： 浮力大小的计算；速度的计算；功的计算．

考点点评： 本题考查了学生度对速度公式、功的公式、阿基米德原理的掌握和运用，因条件已给出，难度不大．

（1）王霞同学要认识到男生女生的正常交往是不可避免的，建立起友谊是正常的。在青春初期，小心走好人生的每一步，把男女同学之间的友谊作为滋润心灵的春雨，让自己健康成长。
（2）要学会以恰当的方式来表达男女同学之间的友情。第一，要自然、大方的进行交往，扩大交往的范围，建立纯洁的友情；第二，要学会尊重对方；第三，要学会自爱、自重，爱护自己的尊严和名誉，珍惜自己的人格和人品，懂得保护自己。

3.75亿年前的远古“美人鱼”的发现，说明包括人类在内的四足脊椎动物的祖先就是从海里上岸的，再次有力地支持了达尔文的进化论（或证明达尔文的进化论没有错）。（意对即可）

1 我们见到的是毛竹,高大、笔直、粗壮,是园林建筑的好材料.
2 更能衬托出“枝疏叶柔清丽俊秀典雅的婵娟风姿,挺拔凌云坚贞不阿刚直有节的操守和特质”.
4 抒发情感,体现出我爱竹子和那片名不见经传的普通竹林.

（1）全球气候变暖，是全人类共同关注的问题．气候变暖的原因主要有：①新研究显示，地球变得越来越暖的原因是，太阳辐射处于近1000年来最强烈的时期，而且太阳辐射增强对臭氧层和云层的影响所带来的气候变化，可能比太阳光的影响更大．也就是全球变暖可能是太阳活动加剧造成的，“温室效应说”；②宇宙射线说．《英国皇家学会学报》今年2月的一篇文章说，宇宙射线可能在云层形成的过程中扮演重要角色．丹麦气象科学家亨利克•斯文斯马克表示，有实验显示，人类对全球变暖的影响可能比许多科学家以前所认为的小得多．③动物废气说．联合国粮农组织日前发表的报告说，全球10.5亿头牛排放的废气，是导致全球变暖的最大元凶．牛群的屁等排泄物会产出100多种污染气体，其中氨的排放量占全球总量的2/3，氨正是导致酸雨的原因．牛屁中有大量甲烷，其暖化地球的速度比二氧化碳快20倍．
④还有的欧洲气象学家通过卫星监测和计算机计算认为，大气污染阻碍了地球散热，是地球日益变暖的根本原因．
（2）全球气温变暖，危害很多．如：全球变暖将给地球和人类带来复杂的潜在的影响，既有正面的，也有负面 的．例如随着温度的升高，副极地地区也许将更适合人类居住；在适当的条件下，较高的二氧化碳浓度能够促进光合作用，从而使植物具有更高的固碳速率，导致 植物生长的增加，即二氧化碳的增产效应，这是全球变暖的正面影响．但是与正
面影响相比，全球变暖对人类活动的负面影响将更为巨大和深远．今年8月份CCTV报道，由于气候变暖的影响，珠穆朗玛峰的顶峰下降了1.3米．祁连山冰川融化比上个世纪70年代减少了大约10亿立方米，冰川局部地区的雪线正以年均2-2.6米的速度上升．专家分析，冰川退缩，雪线上升除自然气候因素外，另一个主要原因是人口膨胀，超载超牧，过度开垦，乱砍滥伐，滥采地下水有关．
故答案为：（1）全球变暖可能是太阳活动加剧造成的，“温室效应说”，宇宙射线说，动物废气说，大气污染阻碍了地球散热．
（2）只要学生能围绕全球气候变暖来展开说明，均可给分．

dear xiao ming
l’m glad to tell you how to improve your English. At first, you should listen to your teacher carefully, and speak English as much as possiple. When you read English, please read it widely, because it will help you to learn it better. It is very important to learn it by heart, too. You can also improve your English by practicing writing in English. I think listenning to English songs is also a good way to learn more English, you can have a try.
yours,
xiao hua

（1）过滤操作中不需要进行加热，所以提供仪器中的酒精灯在进行过滤操作不需选用；
故答：E；
（2）酚酞遇酸性溶液不变色，因此在检验酸性溶液时不选用酚酞而选择遇酸性溶液变红的石蕊；利用pH试纸可以测定溶液酸碱度，当pH＜7时溶液呈酸性；
故答：石蕊试液，pH试纸；
操作：取水样少量倒入试管，滴加紫色石蕊试液；现象：紫色石蕊试液变红；结论：水样呈酸性；
（3）处理呈酸性的废水，应加入碱，熟石灰氢氧化钙是生活中常见的一种碱，选用氢氧化钙处理酸性废经济实惠；
故选Ca（OH） ₂

解题思路：运动员在0时刻开始先做自由落体运动，然后做加速度逐渐减小的加速运动，在平衡位置速度最大，然后做加速度增大的减速运动，到达最低点速度为零．

A、在t₁～t₂时间内做加速度逐渐减小的加速运动，加速度逐渐减小，根据牛顿第二定律，合力逐渐减小．故A正确．
B、t₃时刻速度变为零，即到达最低点．故B错误，D正确．
C、在t₄时刻处于平衡位置，速度最大，但弹力不是最大，在最低点弹力最大．故C错误．
故选AD．

点评：
本题考点： 牛顿第二定律；匀变速直线运动的图像．

考点点评： 解决本题的关键会根据牛顿第二定律通过合力的变化判断加速度的变化，会根据速度方向和加速度方向的关系判断速度的变化．

My dream
As is shown in the table, my classmate’s dream vary considerably. Li long, whose mother is a music teacher, has a gift for music and is fond of singing and dancing. As a devoted fan of Singer Song Zuying, she wants to be a singer when growing up. As for Wu Dong , he is not only strong but also good at sports. He likes playing basketball, running and so on. His dream is to become a national athlete.
Personally , I dream of becoming a doctor in the future. It’s a virtue to cure the wounded and rescue the dying. Doctors are always respected and admired by people. Furthermore, I’m good at biology , chemistry and so on ,which will lay a solid foundation for becoming a qualified doctor.
In my opinion, people may gain what they dream of after hard work.

D

Dear Mr.Black,I am gald to know Mike and had chance to talk with him about the ways to learn English better.First, we think reading English newspaper is a good way, during reading, we can learn some n...

用词造句方面没有抄……
这个需要看你用的材料和表达的意味是否与原文一样
立意可以相近,但主旨不能有具体地完全地相同
如果你立意相近,材料也差不多,构成了实质性的近似,就是抄袭了.
不好说的,还是要看你的文章和原文才能判断.

解题思路：根据动能定理求解运动员动能的减小量，根据重力做功求解重力势能的减小量．根据运动员克服阻力做功，求解机械能的变化量．

A、运动员进水过程中合力对他做功为（mg-F）h，则根据动能定理得知，他的动能减少了（F-mg）h．故A错误．
B、重力对运动员做功为mgh，则他的重力势能减小了 mgh．故B错误．
C、D运动员克服阻力做功为Fh，则他的机械能减少了 Fh．故C错误，D正确．
故选D

点评：
本题考点： 动能定理的应用；功能关系．

考点点评： 本题考查对几对功能关系的理解和应用能力．其中机械能的变化量也直接根据动能与重力势能的变化之和求解．

答案（1）：这种动物的生活环境在非洲扎伊尔东部的热带雨林地带
答案（2）：它属于偶蹄类动物
答案（3）：应该是和山羊一类的动物,因为它虽然身体像老虎前额像狮子但
是没有猫科动物的特征（脚上的肉垫,以及胡须之类的）,此外
猫科动物都是食肉的；
从以给出的形态以及习性上说上说符合偶蹄类生物的特性
答案（4）,（5）不正确,不同意

碳反应就产生二氧化碳但煤复杂得多 .现在很少用煤了.应该是木炭
煤中有机质是复杂的高分子有机化合物,主要由碳、氢、氧、氮、硫和磷等元素组成,而碳、氢、氧三者总和约占有机质的95％以上；煤中的无机质也含有少量的碳、氢、氧、硫等元素.碳是煤中最重要的组分,其含量随煤化程度的加深而增高.泥炭中碳含量为50％～60％,褐煤为60％～70％,烟煤为74％～92％,无烟煤为 90％～98％.烧起来比较呛.

固体硫化亚铁（FeS）与稀硫酸在常温下反应制取硫化氢属于固体和液体混合反应不需要加热的反应，所以实验室制取二氧化碳的发生装置；硫化氢能溶于水，它的水溶液叫氢硫酸，所以多余的H₂S可用碱液吸收例如氢氧化钠溶液．
故答案为：CO₂；NaOH．