李娜和王丽丽都是班内的学习优秀生。李娜积极参加班内组织的集体活动，同学们有了学习上的疑难问题她也不厌其烦地给予解答。有一

法网一役,势如破竹,气势恢宏震九州；破釜沉舟,气贯长虹,名满亚洲展雄威；首轮铤险,耀武扬威,挫捷克新锐热身；次轮矫健,霸气逼人,令西班牙人神伤；三场强势,火力全开,送别罗马尼亚新贵；四场苦战,绝地逆转,斩落科娃闯八强；五场闪亮,状态神勇,挑落阿扎进四强；六场高歌,势不可挡,横扫莎娃挺决赛；末战斯齐亚沃尼,天道酬勤,名垂青史,树华人新风!

解题思路：本题为追击问题，根据两人赛跑的过程中当第一次两人相遇时路程的差为400米列出方程求解即可．

设经过t分钟两人第一次相遇，
由题意得，320x-280x=400，
解得：x=10．
即经过10分钟两人第一次相遇．
故答案为：10．

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，掌握有关追击问题中的等量关系是解决本题的关键．

C

我尽量写的幼稚一点：
Hi teacher,I am Li Na.Because my grandma is fever and my parents are both in business trip,may I have 3 days leave from Apr 6th,to take care of my grandma.I will try to come back to school as soon as possible,and learn the classes I missed.
Thanks

正确答案为：
Lina seems happy today.

解题思路：（1）物体保持匀速直线运动的条件是：不受力或受平衡力；
（2）在地面附近的一切物体都会受到重力的作用；
（3）物体的动能和物体的质量及其运动的速度有关；物体的重力势能与物体的质量及物体离地面的高度有关．

A、由于球离开球拍后，由于惯性会继续保持运动状态，在空中其只受到重力的作用，故该选项错误；
B、只要是地面附近的一切物体都受到重力的作用，故网球离开网后始终受到重力的作用，故该选项正确；
C、在计空气摩擦的情况下，即网球与空气摩擦，网球的一部分机械能会转化为内能，故其机械能会减小；若在不计空气摩擦时，其机械能是不变的，故该选项也是错误的；
D、当网球离开球拍后，其上升过程中，是动能转化为重力势能，在其下落过程中，是重力势能转化为动能，故该选项也错误．
故选B．

点评：
本题考点： 动能和势能的大小变化；机械能．

考点点评： 此题主要考查物体受力的分析，以及力和运动的关系，同时也对能量的转化进行了检测．

李娜,赵青,参加作文竞赛了.
李娜!赵青参加作文竞赛了?
李娜赵青参加作文竞赛了?
李娜!赵青参加作文竞赛了.

解题思路：当一个物体对另一个物体有力的作用时，另一个物体也同时对这个物体有力的作用，即力的作用是相互的；速度大小的改变、运动方向的改变都是运动状态的改变．

拍击球，施力物是拍，受力物是球；拍变形受的力，施力物是球，受力物是拍．这一现象说明物体间力的作用是相互的；
球的运动方向和速度大小的改变是力改变了物体的运动状态．
故答案为：力的作用是相互；运动状态．

点评：
本题考点： 力作用的相互性；力的作用效果．

考点点评： 一个物体在施力的同时必然也受力，另一个物体在受力的同时必然也是施力物体，这说明物体间力的作用是相互的，甲对乙的力和乙对甲的力是一对相互作用力．

上午在校时间：11时5分-7时40分=3小时25分；
下午在校时间：3时40分-1时30分=2小时10分；
所以在校时间为：3小时25分+2小时10分=5小时35分．
答：李娜每天在学校的时间是5时35分．
故答案为：5；35．

Dear Li Na, time to break up.
请采纳，谢谢！

Dear mummy and daddy,
I'm fine here, I have meals everyday on time. There are many kinds of food and drinks I like.
Normally I have milk, eggs, bread with butter for breakfast; a mushroom, tomato pizza, salad and juice for lunch; hamburgers and hot dogs for afternoon tea. I'll go home to have dinner, which will be rice, meat, vegetables and fruit.
I'll take care of myself here.
Best regards,
Li Na

你好,压力过大,首先要面对现实,适应环境,只有这样才能够发挥自己最大的能力去改造环境,以求外界现实符合自己的主观愿望,同时在力不能及的情况下,又能另择目标或重选方法以适应现实环境. 其次,中年人要与人为善,乐于与人交往,和他人建立良好的关系.还要多和朋友交流思想,多听听音乐,多锻炼身体.

解题思路：力的作用效果有两种，一是力可以改变物体的运动状态，二是力可以改变物体的形状．李娜用球拍将球击出的过程中，改变了球的运动方向，同时也改变了球的运动速度，所以在击球过程中，改变了球的运动状态．物体间力的作用是相互的．一切物体都具有惯性．

A、网球发生形变属于力改变了物体的形状．符合题意．
B、大力击球时，球拍受力会发生形变，不合题意．
C、一切物体都具有惯性，不合题意．
D、物体间力的作用是相互的，球拍受网球的作用力，不合题意．
故选A．

点评：
本题考点： 力的作用效果；力作用的相互性；惯性．

考点点评： 此题考查了力的定义、力的作用效果、相互作用力和惯性等知识，要会运用．

解题思路：本题为追击问题，根据两人赛跑的过程中当第一次两人相遇时路程的差为400米列出方程求解即可．

设经过t分钟两人第一次相遇，
由题意得，320x-280x=400，
解得：x=10．
即经过10分钟两人第一次相遇．
故答案为：10．

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，掌握有关追击问题中的等量关系是解决本题的关键．

Dear Xiaohua: How are you recently? I have a good journey in America. I went to NewYork firstly and saw many skyscapers but I had no chance to see the World Trade center. I went to los angeles after 2 days and I visited Hollywood and played in Disnayland. And I also visited Reno of Nevada, I saw a very beautiful river----Dahu.

Dear everybody,My name is li na,I don't care,I lost my red notebook,who picked up to contact me,my telephone number thanks a lot.

解题思路：本题为追击问题，根据两人赛跑的过程中当第一次两人相遇时路程的差为400米列出方程求解即可．

设经过t分钟两人第一次相遇，
由题意得，320x-280x=400，
解得：x=10．
即经过10分钟两人第一次相遇．
故答案为：10．

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，掌握有关追击问题中的等量关系是解决本题的关键．

Dear Xiaohua:
How are you recently?I have a good journey in America.
I went to NewYork firstly and saw many skyscapers but I had no chance to see the World Trade center.I went to los angeles after 2 days and I visited Hollywood and played in Disnayland.
And I also visited Reno of Nevada,I saw a very beautiful river----Dahu.

作为亚军的李娜发表获奖感言时先对小克表示了祝贺：“首先我要祝贺小克,你这两周打得非常棒,这个赛季打得也很棒.另外我还得感谢我的团队,特别要感谢那个男人,你们看到那个穿黄T恤的人了吗,他就是我的丈夫,我之前开了他不少玩笑,其实不管你是胖是瘦,或者是丑是帅,我都会跟随你到永远,我爱你!”这番话得到了现场观众羡慕的掌声,也令姜山非常感动.
虽然输掉了比赛,李娜依然表现得很乐观：“我为自己感到骄傲,因为不论输赢我已经尽力了.马上就是中国的春节了,我要回家陪陪家人,祝大家春节快乐,我们明年见!”

解题思路：根据题意，先求出语文和外语的总成绩，用平均分93乘科数2，再用三科的平均分95乘科数3，求出三科的总成绩，进而用三科的总成绩减去两科的总成绩，就是数学必须考的分数．

95×3-93×2，
=285-186，
=99（分）；
答：数学必须考99分才能使三科的平均分是95分．

点评：
本题考点： 平均数的含义及求平均数的方法．

考点点评： 解决此题关键是先根据两科与三科的平均数，分别求出两科的总成绩和三科的总成绩，进而相减得解．

Dear Miss Li :
I would like to invite you to my birthday party.I wish you can come and give me your wish!If you are free,please arrive my home at 18:00 next Saturday.I will serve delicious food and drink for you.Wish I can see you!
Sincerely yours,
Li Ming

I want to introduce LiNa with you

法网夺冠只是一个新的起点，我的运动生涯还很长，今后的路还等着我继续前行。

解题思路：在所给的条件中，“王菲既不穿蓝裙子，也不穿花裙子”是关键条件．因为3个人穿的裙子只有花、白、蓝3种颜色，因此蓝花两种颜色，王菲只能穿白色裙子．又知道“莫文蔚没有穿蓝的”，结合已推断出的“王菲穿白色裙子”，因此莫文蔚只能穿花裙子．3种颜色中已确定了两种，剩下的李娜必定穿蓝色裙子．

根据题干分析可得：
穿白裙子的是王菲，
穿蓝裙子的是李娜，
穿花裙子的是莫文蔚，
答：穿白裙子的是王菲，穿蓝裙子的是李娜，穿花裙子的是莫文蔚．

点评：
本题考点： 逻辑推理．

考点点评： 此题抓住题干中的“王菲既不穿蓝裙子，也不穿花裙子”，先确定穿白色裙子的是王菲，是整个推理的关键．

王红：教师
李娜：法官
张梅：医生
分析：
张梅比教师年龄大－－张梅不是教师
王红和医生不是同岁,医生比李娜小－－王红、李娜都不是医生－－张梅是医生
张梅比教师年龄大,医生比李娜小－－张梅比教师年龄大,张梅比李娜小－－李娜不是教师－－李娜是法官、王红是教师.

D

刘子鸽：郭晶和李娜到图书馆去了.
刘子鸽：郭晶和李娜到图书馆去了?
刘子鸽（顿号）郭晶和李娜到图书馆去了.

设：答对X道,倒错或错答（10-X)道,则有:10X-2*(10-x)=76X=8说以；打错或不答2道：答对8道

法网一役,势如破竹,气势恢宏震九州；破釜沉舟,气贯长虹,名满亚洲展雄威；首轮铤险,耀武扬威,挫捷克新锐热身；次轮矫健,霸气逼人,令西班牙人神伤；三场强势,火力全开,送别罗马尼亚新贵；四场苦战,绝地逆转,斩落科娃闯八强；五场闪亮,状态神勇,挑落阿扎进四强；六场高歌,势不可挡,横扫莎娃挺决赛；末战斯齐亚沃尼,天道酬勤,名垂青史,树华人新风!

学过,而且经常出国比赛,另外她的教练也是老外,所以就会讲
你讲的多了你也会

解题思路：本题为追击问题，根据两人赛跑的过程中当第一次两人相遇时路程的差为400米列出方程求解即可．

设经过t分钟两人第一次相遇，
由题意得，320x-280x=400，
解得：x=10．
即经过10分钟两人第一次相遇．
故答案为：10．

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，掌握有关追击问题中的等量关系是解决本题的关键．

Li na in the success of the French open greatly enhanced my confidence.

翻译：Li Na is a tennis sta

李娜用球拍将球击出的过程中，改变了球的运动方向，同时也改变了球的运动速度，所以在击球过程中，改变了球的运动状态．
击球过程中，球拍将网球击扁，网球还能恢复原状，说明网球具有弹性，被击扁的网球具有弹性势能，或具有能量．
故答案为：运动状态；能量（或弹性势能）．

My friends do sports everyday
I think he has a football too.
Lina plays tennis but not basketball.

李娜获得冠军时,奥运会赛场播出雄壮的《义勇军进行曲》,升起鲜艳的五星红旗.

my name is LiNa ,I lost a red book ,my phone is 6335682.If you find it please call me .thank you

（一）
Li Na wins women's French Open final
Li Na wins it all at Roland Garros
PARIS - History-making tennis legend Li Na notched the first-ever grand slam women's singles title for China and Asia,beating defending champion Francesca Schiavone of Italy 6-4,7-6(7/0) in the French Open final here on Saturday.
The triumph also gifted Li Na a great rise from No 7 to No 4 on WTA rankings.
Boasting far more direct winners than Schiavone,Li Na,29,dominated the match with her powerful and sharp-angled strokes,breaking the Italian's third serve game in the fist set and the first in the second set.
Schiavone,30,a dark horse in last year's French Open who had eliminated Li Na in the then third round,played all out today with all her weapons,such as high-bounced serves,great volleys and spinned balls.
Thanks to Li Na's unforced errors,Schiavone broke Li's fourth serve game to tie the score 4-4 in the second set.
From 5-5 to 6-6,the tough battle was interrupted several times by checking the ball was in or out.In the deciding game,Li Na stormed to victory with a 7-0.
In such a great final,Li Na deserved the win.
Li Na of China returns the ball to Francesca Schiavone of Italy during their women's final at the French Open tennis tournament at the Roland Garros stadium in Paris June 4,2011.
Li Na of China reacts during her women's final against Francesca Schiavone of Italy at the French Open tennis tournament at the Roland Garros stadium in Paris June 4,2011.
（二）
Li Na of China celebrates defeating Francesca Schiavone of Italy in the women's final of the French Open tennis tournament in Roland Garros stadium in Paris,June 4,2011.
VOA Sports June 04,2011 - At the French Open tennis tournament in Paris on Saturday,Li Na became the first Chinese player,and the first player from any Asian country,to win a Grand Slam singles title.
Li defeated last year's women's French Open winner,Italy's Francesca Schiavone,6-4,7-6.
Both players are age 29,which is considered old in the world of tennis.When Schiavone took the 2010 title,she became the oldest first-time women's champion since professionals began competing in 1968.She also was the first Italian Grand Slam women's champion.
Li,who was seeded sixth in the French tournament,was defeated in the Australian Open final earlier this year.She is now expected to jump to number four in the international rankings.Her victory also could spark renewed interest in tennis in her Chinese homeland.
Both players won six games in the final set,leading to a tie-breaker that Li won 7-0.When Schiavone hit long on match point,Li celebrated her victory by falling on her back onto the clay Paris court.It was her first title on clay.
（三）

Na Li is the most incredible tennis player of China. Up to now ,she got four single titles and two double titles of WTA, and what`s more she is the first chinese player who got the single title during the WTA tour. Besides she is the first top ten player of China who gets NO.7 right now. In 2008 Beijing Olympics Game, she reached to semifinal in the single game. And this year,she reached to the final of Australia open which was the first time for an Asinan player to get into final of a grand slam`s single. And we believe that she can make more miracles in the future.
老了,英语退化了

苹果：2*2*8=32 橘子：5/3*9=15,所以一共32+15=47元.如有疑问可追问.

这次网球公开赛,中国选手李娜难道没有取得优异成绩?
闰土的生活很快乐,难道我不羡慕吗?

hello,everyone.My name's LI Na.Now,I'd like to introduce myself.When I'm free,I like to play tennis with my friends.I think It's a good sport to practice myself.And I can enjoy my time with my friends so that we can get along very well.And I have a balance diet.I seldom eat junk food.I keep eating fruit and vegetales everyday.what's more,I like drink milk.I think healthy diet can give me healthy body.That's all.Thank you.

won first prize.first前不加the,参照初二上英语教材57页3a部分.

解题思路：以网球为研究对象，在拍子击打网球的过程中，网球水平受到拍子的作用力，速度大小和方向发生了改变，根据动量定理研究拍子的作用力的冲量．

取拍子击打前网球的速度为v₁方向为正方向，根据动量定理得
拍子对网球作用力的冲量I=-mv₂-mv₁=-m（v₁+v₂），即冲量大小为m（v₁+v₂），方向与v₁方向相反，与v₂方向相同．
故选B

点评：
本题考点： 动量定理．

考点点评： 本题是实际问题，考查应用物理知识分析处理实际问题的能力．对于变力的冲量常常根据动量定理求解．

Dear Lina:
I'm Li Ming,tomorrow is my birthday.I will have a birthday party in my home at 7:30~10:30 tomorrow evening.We are good friend so I hope you can attend my birthday party .I will very happy if you can join in .My home is in 201,Building 30 ,ZhongShan road .You can go by taxi,It's more safely.And I'm also willing to shuttle you .See you tomorrow night!
Yours,
Li Ming

赞成：李娜向全世界展示了荆楚儿女的顽强拼搏精神奖励李娜是传递正能量。反对：李娜不缺钱奖励李娜可以有其他方式80万应该用在更需要的地方。

解题思路：已知开始时间晚上9时和经过时间107分钟，即1小时47分钟，求结束时刻，用开始时刻加上经过时间，即可得解．

107分钟=1小时47分钟，
晚上9时+1时47分=晚上10时47分，
答：结束时间是晚上10时47分．

点评：
本题考点： 日期和时间的推算．

考点点评： 此题考查了时间的推算即用开始时刻+经过时间=结束时刻．

序数词前面一般加the,但如果序数词前面已经有代词了,就不需要了.
her twentieth birthday

18*0.8a+13