张悦从家骑自行车去海滨,先下山后走平地,他以每小时12千米的速度下山,又以每小时9千米的速度通过平地,到达

要那一段自己找吧
A Letter To My Parents
Dear Mom and Dad,
I love you! I love you so much! I love you with all my heart! This letter to you is to tell you my true feelings from the bottom of my heart.
Thank you so much for bringing up! Thank you so much for raising me. I know how hard you’ve worked during the past years. I can image how many difficulties and obstacles you’ve conquered. I can imagine all the problems you have faced and all the sweat and tears you have shed to make my life better. I can fully understand what a huge responsibility it is to raise a child. You’ve been very patient with me. You’ve encouraged me and you’ve helped me. You’ve tried your hardest to give me the best things in life. You’ve made a lot of sacrifices and many difficult choices. I also know that you have great expectations of me. You want me to be very successful and happy. You want me to be the best person I can be. You want me to do great things with my life. You want me to make the world a better place. I know you have so many so many hopes and dreams for my future.
Today I want to tell you something extremely important.
Today I want to tell you that you don't need to worry about me any more. I'm grown up! I will be responsible for my life and for my future. I will study very hard. I will exercise everyday to keep fit. I will read English every morning and every night. I will make the best use of every spare minute. I will be happy, confident, positive and energetic everyday! I will develop good habits and use them to constantly improve myself. I will never do anything that would harm my body or my mind. I will never do anything that would make you feel disappointed or ashamed. I will learn as much as I can and become smarter and stronger every day. I have learned by watching you that the best way to reach my goals is to work hard and never give up. You’re my best role models. You set a great example for me.
I have so many great dreams. I know that realizing these dreams will take a lot of time and effort. But don't worry about me. I have strong confidence in myself. I know if I keep trying, keep working hard and keep dreaming, I will definitely realize all my dreams. I will be somebody special. But I will not only care about myself. I will contribute to my school, my hometown and my country. I will contribute to society. I will use all my abilities and talents to help my family and my country have a glorious future. I will make a difference in this world.
Dear Mom and Dad, you’ll be proud of me! You will see great results from all your hard work and sacrifice. Thank you very much for your continued support! Thank you very much for your patience, love and understanding. I love you! I appreciate you! I’m very proud of you!
Exercise every day to keep healthy! Enjoy life every day and stay happy! My only hope for you is you both to enjoy continued health and happiness. You brought me into this word to share your life. I will do my best to make sure each day of it is filled with joy and pride.
Mom and Dad, you are the best parents in the world! I don’t know what I would have done without you.
All My Everlasting Love,
Your Son /Daughter
给爸爸妈妈的一封信
亲爱的爸爸妈妈：
我爱你们!我是多么的爱你们啊!我全心全意去爱你们!给你们写这封信是想告诉你们我内心深处的真实感受.
感谢你们抚养我长大,感激你们的哺育之恩,我清楚地在过去的这么多年来,你们多么辛苦的工作.我能想象你们克服了多少困难与艰辛,也能想象这些年来你们所面对的问题,还有你们为我的生活变得更加美好而洒下的热泪与汗水!我能深刻理解,抚养一个小孩是多么巨大的责任.你们对我非常耐心.你们一直在鼓励与帮助我.你们尽最大的努力为我提供生活中最好的东西.你们做出了许许多多的牺牲,也做过很多困难的抉择.我也知道你们对我有殷勤的期望.你们希望我成功并快乐,你们希望我成为最好的人,你们希望我能用生命去做伟大的事情,你们想我能将这个世界变得更加美好.我知道你们对我的未来有许多希望和梦想.
今天我要告诉你们一件极其重要的事.
今天我想跟你们说不需要再为我担心了.我已经长大成人.我会为我的人生和未来负责的.我会用功读书.我会每天锻炼身体,保持良好心态.每个清晨与夜晚我都会读英语.我会充分利用闲暇的每一分钟.我每天都会快乐、自信、积极向上并且精力充沛!我会养成良好的习惯,并且利用它们不断完善自己.我不会做任何有伤身心的事情.我不会做任何让你们失望或感到羞耻的事情.我会尽量的多学习,每天变得更聪明、更强壮一点.在你们身上我看到要达成目标的最好的办法是刻苦,并且永不放弃.你们是我最好的人生楷模,为我树立了一好榜样.
我有许多伟大的梦想.我知道要实现这些梦想要花很多时间与精力.不过不要为我担心,因为我对自己有强烈的自信心.我知道只要我一直坚持不懈,敢想敢拼,一定能实现我所有的梦想.我会成为不平凡的人,不过我不会只关心自己,我会为学校、为家乡、为祖国做出贡献.我会回报社会.我将用自己的聪明才智让我们的家及我们的祖国拥有一个光辉的未来.我会在这个世上作出点成就来.
亲爱的爸爸妈妈,你们将会为我自豪的.你们将会看你们所有的辛苦与牺牲都是有好的结果的.非常感谢你们一直以来的支持!感谢你们对我付出的耐心、关爱与理解.我爱你们!我感激你们!我为你们而自豪.
每天坚持锻炼保持身体健康.享受生活,快乐每一天!对你们的唯一希望是希望你们能保持健康与幸福.是你们把我带来这个世界上,来分享你们的生活.我会尽力保证每一天你们的生活都是充满快乐与骄傲.爸爸妈妈,你们是世界上最好的父母!真不知道如果没有你们,我会怎么样.
永远爱你们的女儿、儿子

C

50÷5=10（根）；
答：共需10根蜡烛．

放学回家的路上,张悦对李丹说：“我在研究凸透镜成像问题中,发现物体距透镜30cm时,在距物体40cm的光屏上 得到（一个倒立、放大的实像.）”
可以计算其焦距为：
1/f=1/u+1/v=1/30+1/10=4/30
所以,f=30/4=7.5(cm)

1. 张悦今年x 老师今年y
y-x=x-1=37-y =>x=13, y=25
2. 38+(38+2)+(38+2*2)+...+(38+2*24)=38*25+(2+24)*24/2=1262
3. 9/4*11=99/4=24.75
4. =18,23的公倍数且在（400,450）内=414
5. 甲班不动,外来4个,总数98+4,正好两个甲班人数,所以甲班=(98+4)/2=51,乙班51-4=47

解题思路：根据凸透镜成像规律可知，当u＜f时，成正立放大的虚像；当2f＞u＞f时，v＞2f，成倒立的放大的实像；当u＞2f时，f＜v＜2f，成倒立的缩小的实像．

根据题意可知物距为30cm时，像距为40cm，说明像距大于物距，即2f＞u＞f、v＞2f，则成倒立放大的实像，故只有C的说法正确．
故答案为：C．

点评：
本题考点： 凸透镜成像的应用．

考点点评： 本题主要考查的是凸透镜的成像规律以及应用．

(26-1)/20%=125 页

分析：
下一次应从第26页看起,说明之前看了(26-1)页
书的总页数=已经看了的页数/已经看了的占总页数的比例

设山路为x公里,平路为y公里,列方程如下：
x/12+y/9=11/12
x/6+y/9=7/6
得：x=3,y=6 则x+y=9公里