《同学们的脸上洋溢着愉快的心情》这是什么病句

当杨柳依然摇摆，当野花依然盛开，当枫叶依然落下；当雪花依然飘落；当春夏秋冬依然到来……我却没有依然来到这儿---母校。母校，一个人的一生奋斗的起点！我忘不了在母校生活的点点滴滴，更舍不得离开这个熟悉的地方。可我今天却要背起书包踏上一条陌生的路，去迎接了另一个团徽的呼唤。人生的道路，我将又迈出一小步！
当我触摸着校园的大门，准备离开这个学校时，眼前却不断浮现了这一幕：妈妈带着我走进这个当初陌生的校园。当时，我对这里的一切都很好奇。妈妈又带着我走进一间教室，为我选了一个位置，和老师说了几句话就走了，看看妈妈匆匆离去的身影，又望了望周围那些陌生的面孔，心中不由的一阵凉意：“好孤单呀！”一个恬静的声音在耳边响起：“你好！你叫什么名字？你怎么了？”我小声的说：“没事的。”她笑了笑说：“有事告诉我，我会帮助你的！”当我感受到这两个问号，一个感叹号，我就知道这个校园一定是快乐、美丽的地方，充满情意的地方。
今天，我与同学们互相写着毕业赠言，也为老师们写下温馨的祝福。我把那一张张带有情谊的纸张放入同学录，这样同学录将成为我们的联络图；将成为我们年轻的问侯；将成为我们友情的桥梁；将成为我们永远的祝福；将成为……大家互相拥抱，带着不舍的心情挥泪告别，我想说：“你们给我最珍贵的礼物，真诚的友情，我将永远珍藏在心底。”老师们也很不舍，当了他们六年的学生，转眼间我们就要离开了这个校园了。所以我想对老师说：“老师，您是我心中最闪耀的一颗星星，当了您六年的学生，我才明白春雨是怎样染绿世界的。”看着即将要离开的校园，大家的心中都是万分不舍，我想说：“校园是我另一个家，给了我无数温暖与爱，我还会回来的。”
我触摸着校园的大门，迈着缓缓的步伐离开了，我每往前走一步，我的心就真的好不舍……
再见了母校，再见了老师，再见了同学们！

And my classmates togethe

（1）Ca的名称为：钙； 氢 的元素符号为：H；硫 元素符号为：S；银 元素符号为：Ag；Mn的名称为：锰；
故答案为：钙；H；S；Ag；锰；
（2）根据物质的化学式正确书写物质的名称分别为：①氧气；②四氧化三铁； ③二氧化硫；④碳酸氢氨； ⑤锰酸钾；
故答案为：①氧气；②四氧化三铁； ③二氧化硫；④碳酸氢氨； ⑤锰酸钾．

I often

演讲稿-----我们应该多读点书

解题思路：人体内最大的细胞是卵细胞．

卵细胞呈球形，直径在0.1毫米以上，几乎用肉眼就可以看出，这是人体内最大的细胞．卵细胞的细胞质里含有丰富的卵黄．卵黄是胚胎发育初期所需要的营养物质．
故选：D

点评：
本题考点： 精子和卵细胞，受精．

考点点评： 因为受精卵早期发育的营养主要由卵细胞提供，所以卵细胞个体很大．

不感兴趣的书不看,再好也不看.看感兴趣的书.

看感兴趣的书,看一遍不行,要看好几遍.
看第一遍的时候,对感兴趣的这一段边看边琢磨.
看第二遍的时候,第一遍没感兴趣的那段,第二遍可能感兴趣了.,

A, respect teachers, dear schoolmates
B: Happy New Year!
A, how time flys,just like calendar pages falling down, we came to the end of this year.
B,dragon year has gone quietly, the snake year is caming soon, in the past year, we worked hard and studied hard together, and obtained joyfull.
A, in the new year we plan to do our best with hope.
B, on the occasion of the new year, all of us,the teachers of wisdom tree kindergarten, children and parents gather here.
Both: to celebrate the arrival of the new year.
A, looking back we are filled with pride
B, looking forward we have more responsibility
A, in order to make the beautiful dream come ture, let us together bright the New Year candle
B, we wish light as usual and bright fovever
A, to celebrate the new year's day, we XX the kindergarten has made elaborate preparations, B, the students have prepared alot of wonderful and interesting program under the guidance of teachers.
A, let us sing, with lively melodies, show children's naivete style now,
B, let us dancing, with the graceful dancing to express our full of joy
A, today, let us feel joy carefully with our heart, feel the warmth with love.
B, open your heart, release your passion.
Both: XX kindergarten "the stars of tomorrow,the bright of future" show now!
A, happy time is always so short
B, the day we get together always let us move
A, today we sing happily and converse joyfully
A, let us remember today
B, today we think about the future,look forward to tomorrow
A, today, we are gathered together to talk about the joy of success,
B, today, we are laughing, go through the Spring Festival together.
A, dear colleagues,
B, please let us wish you once again : Happy New Year, all wishes come true, good luck in everything
A, we will use a responsible attitude and actions to prove that: we can do better
B, XX kindergarten show is over!Thank you.

Respect teacher,dear students：
Good morning,
My name is ...and I am from class 7 grade 5 .

C

My classmates told me to keep walking up.

一缸水，用去1／2 和5 桶，还剩30%，这缸水有多少桶？ 设这缸水有x 桶。 0.5x+5+0.3x=x 0.2X=5 X=25 答：这缸水有25 桶。 5÷(1- 2 1 -30%)=25 2、一根钢管长10 米，第一次截去它的 10 7 ，第二次又截去余下的 3 1 ，还剩多少米？ 10-10× 10 7 =3[米] [10-3] × 3 1 =1[米] 3-1=2[米] 答：还...

Hello,everyone!My name is Yuqin.I come from Longyan which is a beautiful country.I am twenty years old .In my spare time ,I like playing tennis and surfing the internet .I feel happy that I can study with you in the future .

My classmates !! we are study hard !!差不多了

Dear Honored guests, teachers, and students,.today my topic is the inspirational light dreams of youth. “What were your dreams? ”If I ask you the question, I believe that out of 1000 people will be 1001 answers.The China movie partner tells us at the outset: dream, is to make you feel "there is happiness" things.Whatever your hearts what the answer is, but I can be sure that when you get your dreams, hearts must have felt full and warm!Yes, dream is a great yearning.I also have a dream: inspirational in Regretless Youth, lit beyond dreams.
If the youth does not dream, what do we feed desire?If the youth does not dream, we take whatever direction?If the youth does not dream, what we drive?If the youth does not dream, we were able to sail?
Tell yourself:
Nothing could stand in our inspirational youth lit dream's footsteps, because difficulties would only be a Grand we grew up sharpening stone, let the future glittering;
Nothing could stand in our inspirational lit dream of youth, even though we are Caterpillar, to believe in ideals will eventually emerge into a butterfly fly fly;
Nothing could stand in our inspirational lit dream of youth, as we firmly believe, chapters composed for the success of an enterprise is inseparable from our contribution to the positive energy.
Inspirational youth lit dream, we are ready!Come on!
This concludes my--my talk, thank you –

小题1:活动一： (2分) 能紧扣主题即可。示例：微笑标志着自信、雅量、大度，是一种胸怀，一种境界。微笑着面对生活的人失去的只是自己的烦恼，赢得的则是整个世界。亲爱的同学们，你会每天用微笑装点自己的心情吗？今天，让我们走进“微笑面对生活”综合性学习，领略微笑的巨大魅力。
小题1:活动二：（2分）符合题意即可。如爱迪生
小题1:活动三：（2分）失败乃成功之母。失败对我们是有好处的，我们得祝福灾难，我们是灾难之子。


小题1:活动一：拟写开场白，应紧扣活动主题，语言简练生动，有号召力和吸引力，设计合理即可。
小题1:活动二：所举事例必须具有典型性，概括性，针对性，符合题意即可。
小题1:活动三：积累合理即可。

建议选择淡淡的，舒缓的音乐，毕竟带点说教意味，不知，高山流水，怎么样，它有起伏，你可以试一下

180

留连不舍
依依惜别
依依难分
难解难分
留恋忘返
难舍难分
恋恋不舍

三角形的内角和是180 ⁰

掌握三角形的内角和定理．
根据三角形的内角和可知填：180．

到了六年级，忽然变得多愁善感起来。昔日觉得不怎么样的同学们，那张张脸在我心中却变得好可爱，好可爱……又猛得想起要上初中了，马上要和他们告别，心中涌起一阵阵酸……女孩中的男孩——晓婷晓婷，性格像男孩，外...

1. class begins 2.Good morning,class. 3.Is everyone here? 4.Who isn't here?5.Who is on duty today.6.What's the weather like today?7.Be quiet！8.Please listen to me carefully.9.Turn to Page 10.Let's look at the first one.11.Look at the blackboard.12.read loudly,please.13.Are you new here?14.Who can act it out in front of the class.15.Hands up,please.16.Please read after me.17.Who can answer the question?18.Answer it in English.19.Translate the following into Chinese.20.Let's read together .21.Could you introduce yourselves. 22.be quiet.Practise the dialougue in pairs.23.Do you understand?24.Who wants a go. 25.Pardon? 26.Are you ready?Let's listen to the tape.27.Are you clear?28.Your english is good.29.Let's read these sentences again.30.What did we learn last lesson.

It is important to exchange with my classmates,thus,we can interchange our minds with each other.

温度计是利用液体热胀冷缩的性质制成的．在同种条件下，比热容小的，吸收相同热量后，温度变化大，温度计的灵敏度高，测量准确；由题意知：煤油、水银、酒精、水四种物质中，水银的比热容最小，所以从减小实验误差及提高温度计的灵敏程度角度看选取水银温度计最好．
故选B．

“略”（言之有理即可）

[ dear teacher, dear schoolmates, good morning everyone! ] [ the calendar turned to its final page, the wheel of time has left a deep impression, suddenly look back we walked 365 steps, those with our beautiful memory of time will be a thing of the past. [ ] however! We welcome our new year -- 2010! Follow the rhythm of the times, with the blessing of the new year, with youthful vision, let's get together at this wonderful moment. [ ] now, enjoy the New Year bring us joy, enjoy this wonderful time, open your heart, release your passion, let us enjoy it! Please enjoy the show: xxx. [ ] with the pace of the youth, we are approaching to spring, another way, laughing, everything in the wind and snow joyfully waiting. Encouraging youth, we are approaching to spring, another way, laughing, everything is waiting in the Enron laugh. Into the spring, into the vibrant hope, every young heart glow with the colors into the spring, into the fashion world M-Zone, stretching in front of us. [ ] you would like to smile to greet the youthful days and years to the fantastic flowers and green leaves always with you warm memories ] [ here, the faint scent exudes, beating the pulse of youth here, with our passion for life, and our desire for future because, we always believe: tomorrow will be better [ ] the stars still bright, passion is still burning, because of the dream, I exist, you are in your area at youth, I'm on my way tirelessly, and dusk can not stop our footsteps. ]

因为有爱,在心中
所以,被人说有童心,因为用最本质的心在爱着这个世界
一切简简单单~
有童心的人是最快乐的啊~因为可以看到许多别人发现不了的东西~
也许,不久的将来.我们会被这个世界同化~可是不要忘记自己心里的爱吧!用心去爱这个世界~
多到户外走走,多和小孩子在一起,哪怕只是看他们玩耍,都回觉得很快乐啊~
不要忘记,自己最初的愿望,理想~

My father is a sports fan, super like to play badminton.
Dad always study hard and insist on going to the gym practice badminton every night. Father accidentally sprained my ankle in practice, but he didn't stop practicing with ice packs the wound, while practice swing. Dad is so hard, a little pain little fundamental could not prevent his passion for badminton.
Dad do let me understand a truth: there are paying is not necessarily harvest, but don't pay no gain!
翻译：
　我的父亲是一个体育迷,超级喜欢打羽毛球.
　
爸爸总是努力学习,坚持每天晚上去健身房练习羽毛球.父亲在实践中不小心扭伤了脚踝,但他没有停止练习可采用冰敷伤口,而练习挥杆.爸爸太难了,有点痛小根本无法阻止他对羽毛球的热情.
　
爸爸让我明白一个真理:付出不一定有收获,但不付出就没有收获!
　
　
　　
　　

解题思路：天平的正确使用步骤：
（1）把天平放到水平台上，游码移到标尺左端的零刻度．
（2）调节天平的平衡螺母使指针指到分度盘的中央，或左右偏转的格数相同．
（3）物体放在天平的左盘，砝码放在天平的右盘，并调节游码在标尺上的位置，直至横梁恢复平衡．要用镊子夹取砝码，要轻拿轻放，要从大到小．
（4）物体的质量=砝码的质量+游码对应的刻度．
（5）整理器材．
天平的本质是等臂杠杆，验证是否准确，可以从力臂是否相等或压力是否相同考虑．

（1）把天平放到水平台上．
（2）游码移到标尺左端的零刻度，调节天平的平衡螺母使指针指到分度盘的中央，或左右偏转的格数相同．
（3）取两个相同且准确的砝码，分别放在已调平的天平左右托盘中，观察天平是否依然平衡．如果平衡，就是准确的；如不平衡，则不够准确．
故答案为：
将游码移至0刻度，调节平衡螺母使天平平衡；取出两只相同的砝码，分别放在天平的左右两托盘中．

点评：
本题考点： 天平的使用．

考点点评： 在用天平测量物体质量时，注意读数时不要漏掉砝码，游码所对刻度以左侧为准．

几秒钟、一首古诗?你们同学太厉害了吧?!下面给楼主一些改善记忆力的方法吧——记忆,就是过去的经验在人脑中的反映.它包括识记、保持、再现/回忆三个基本过程.其形式有形象记忆、概念记忆、逻辑记忆、情绪记忆、运动...

my grandma often treats my classmates some candies

Respected teacher and dear classmates:
I am on duty today. It is July 18, Monday. Did you have a happy weekend? I had a very meaningful weekend. I went to the zoo. Maybe you have been there many times. But as we grow up, we may forget some places where we often played in the course of our growth. Yesterday I saw elepants and pandas. Good morning, everyone. I have not seen any animals for a long time, so I went to the zoo. I want to tell you: Even if we don't need the playmates who have accompanied us for years in our childhood any more, we still should thank them for taking us a wonderful childhood. So I hope we all can look back, maybe they are still around you, please cherish them. That's all. Thank you very much. Any qeustion is welcome.

我是一个小学六年级的学生，马上将要毕业了，又会有一段难忘的回忆了，又会有一段“生离死别”的场景了。
虽然很想马上立刻升到初中，但也非常不想离开那一个个生动活泼的笑脸、那一段小学六年的记忆。虽然我们班是学校里少有的“恶作剧”班，是一个令老师、校长都“刮目相看”的班，但我们班的优点都是一般人看不出来的，【我可不告诉你哦！】偶们是偶们班的忠实粉丝哦！

不要告诉自己臣妾做不到,因为我们都是天子骄子

解题思路：消化系统由消化道和消化腺组成．消化道包括口腔、咽、食道、胃、小肠、大肠和肛门，消化腺包括唾液腺、胃腺、肠腺、肝脏、胰腺．

A．口腔内舌的搅拌和牙齿的咀嚼，能将食物小块变成食糜，方便食物的消化．A正确．
B．食道是一个细长的管道，基本上没有消化和吸收的功能．B正确．
C．胰腺和肝脏都是位于消化道外的大消化腺．“胰腺和肝脏都是位于消化道内的消化腺”说法错误．C错误．
D．食物经过人体的彻底消化后，蛋白质变成简单的氨基酸、糖类变成葡萄糖、脂肪变成甘油和脂肪酸进入循环系统被吸收．D正确．
故选：C

点评：
本题考点： 各种消化腺的位置和功能．

考点点评： 解答本题要掌握消化系统的组成．掌握消化道各段的特点和各个消化腺的特点．

Respect teacher, dear students! I am XXX, XX year this year;
I always expect the junior middle school life starts from today, I hope that in the new age, new schools, and all the classmates and teachers get along well, learning enjoyable. Spent a good middle school life for 3 years..
Before you came here, my primary school life rich and colorful. Six years of primary school life, the school can and students live together in peace together, but there are also little faults, is my handwriting is not so good, sometimes will affect other students, and the university later in the days I must strive to correct.
The new semester, I am willing and university common progress, with our most valuable years to complete their studies, there are difficulties to help each other, I will be the first to. Please watch over me.
I introduce myself in here, thank you!

甲：敬爱的老师,乙：敬爱的叔叔,阿姨,丙：亲爱的同学们.合：大家好!
甲:寒冷里有我们温暖的相互关心,
乙:大地银装记忆着我们的丰硕成果.丙:我们怀着激动,满含着希望,合:同声祝愿：新春快乐”!
甲：我们经历了欢笑,经历了汗水.乙：你呈现了精彩的小品,我演出了曼妙的舞蹈,他奉献了美妙的歌喉 丙：共同的努力带给大家快乐,但更多的是祝福!合：庆新年联欢会正式闭幕!

(296+40)/56=6

I hope my classmates and I will be good friends forever.

先搞清楚同学之间是什么情况,然后两面夹击,即分别协调两人,不知道能不能帮到你啊!

친애하는 교사, 사랑하는 급우 :
안녕 하십니까! 오늘, "나 사랑 홈" 권리 연설을 시작 싶습니다.
세계의 동쪽에 고 대 국가, 그녀는 아름 답 고 넓은; 세계의 동쪽에는 좋은 나라, 그녀는 근 면 및 강한; 세계의 동쪽에는 비옥한 토양, 마법과 광대 한 그녀의 창 공. 황하의 펜티엄 주기는 그녀의 혈액, 대 산 산 등뼈의 우뚝 솟은 스탠드 그녀, 그녀는 내 나라 중국.
기억 하 고, 엄마는 몇 가지 플래그를 지적 하 고 내게 물었다: 어떤 측면을 할 당신이 가장 사랑? 대답의 자랑: 5와 중국의 붉은 깃발 별, 물론! 어머니 왜 물어? 나는 말했다, "때문에 중국의 붉은 깃발 가장 다채로운 있기 때문에, 중국어로 연의 아들 때문에 중화 민족의 피를 흐르게 했다. ”
수천 년 동안, 바람과 비를 통해 맞은 국토 내. 오늘, 마침내 국제화의 경로에 세계의 지평선에.
이 땅에서 옌 지, 내 고향 오의 마법과 아름 다운 장소입니다.
내 고향-옌 지, 아마도 올해의 많은 노출의 마음에서 아직도 말하기: 낮은, 혼란 주택, 혼잡 하 고 더러운 거리, 문 란 식약청, 거리 노점 따라 배치 정크 사방, 파리 파리 고 시장. 네, 12 년, 옌 지 참으로 초라한 다시 시계 하지만 지금 우리는 사실 볼: 옌 지 지금 급격 한 변화를 겪고 있다. 정리 된 고층 빌딩, 입체 건물, 넓은 깨끗 한 옌 지, 아름 다운 우아한 옌 지 공원, 슈퍼마켓의 행 시 행 거기도 커뮤니티, 레저 광장... 공개 운동 감독... 때마다 밤 떨어졌다, 옌 지 사방 화려한 초기 등불에 입니다. 화려한 네온 램프, 유럽 스타일 건물, 아름 다운 그림을 구성 합니다. 이 환경, 즐거운, 즐거운 자연, 고향에 살고 있는 도시 건설 속도를 빠르게 하기 위해 자랑 스럽게 생각 하는 사람들.
아름 다운 고향 얼굴 눈 우는 도움이 되지 밖으로 내: 나 신속 하 게 당신을 위해 성장 것 이다 사랑 스러운 내 고향, 수 없는 경우에 당신이 당신의 기둥을 잡고, 또한 당신 팀 빛을 위해 만들어진 아름 다운 꽃의 스트레인을 싶습니다.
더 나은 고향 순서로 학생으로 서 어떻게 우리가 해야 합니까?
지금부터 우리는 의식적으로 근 자질을 육성 합니다. 고 대 사상가 한 유에서 말했다: "산업 전문 실사, 레저에 불모. "업계는 원인입니다. 우리가 주택 건설, 근 면의 정신을 무시 하는 즐거움에 대 한 정욕에 탐닉 하는 경우 개발을 계속할 수 있습니다? "남자와 여자, 더 나은 가정을 구축 하는 것이 쉽지만 얻을 수 근 희망에 의존 합니다.
남자와 여자, 더 나은 가정을 공통의 목표의 우리의 새로운 세대와 어린이 청소년의 영광 스러운 책임 되어야 합니다. 우리가 물리에 대 한 교육 사회 연습, 증가 능력에가 서, 문자를 추가. 끊임없이 그들의 자신의 도덕적 인 품질 모양을 자신의 행동을 규제 하 문명, 학문, 에너지를 실질적인 행동, 주택 건설을 입력 함께 "4 개의 좋은" 십 대의 경쟁.
아, 옌 지, 내 사랑 스러운 우리 원 먹이 열정 토지는 집! 우리 세대의 영혼 영양 비옥한 토지는! 당신을 위해 우리의 드레싱, 당신에 게 노래. 가까운 미래에, 내일의 홈 좋을 것 이다을 믿는다! 조국의 내일 더 화려한 될 것 이다!

-望采纳-

Holidays are over.I visited my grandparents with my family this holiday.Both of my grandparents are very happy to see us.They cooked many delicious dishes for us.I enjoy the food very much.After spending a few days with them,it is time to go back home.I will miss my grandparents.

我祝愿
国家
黄河钢琴协奏曲
第一交响序曲
征服天堂
将进酒
我告诉你将进酒绝对合适，尤其是上面那一段特别气势~而且那首诗绝对是之中经典，文章一气呵成，浑然天成，看到的第一遍就爱上了，第三遍的时候就背下来了....是我背的最快的一首~
滕王阁序
文章不错，不过篇幅可能有点长，你要是截一段也是不错的，不过我觉得滕王阁序文章虽然大气，但缺少了将进酒的那种震撼。
记得吗？你的名字叫炎黄！
现代人写的，文章压了“ang”这个韵，这个韵读起来的话特别有气势，而且文章很大气，也是歌颂中国古代文明什么之类的，可以考虑一下。
满江红
满江红确实不错，我们班原来演讲，然后同学就是凭借这个那第一的，但自认为文章未必比得上将进酒什么的~而且朗诵起来应该不会有将进酒的激情。
凤凰涅磐
郭沫若的名作，不过这个比较适合两个人，不过如果配乐的话效果是极其得好，有一次我们学校校庆的时候有学长和学姐来朗诵，超级震撼！但是郭沫若的东西很容易让人读成“无病呻吟”的感觉，因为那个时代的诗都是什么“啊”“呦”之类的~
蜀道难
蜀道难啊，李白名篇阿....文章也是很瑰奇吧，虽然这诗我不太喜欢~
走马川行奉送出师西征
白雪歌送武判官归京
岑参写的是边塞诗，边塞诗都有那种气势磅礴的感觉，不过比较不要把握吧~
司马将军歌 代陇上健儿陈安
简单说，气势就是属于李白的诗的气质~
还有臧克家的有的人....
至于曲子，如果是新诗的话我比较推荐柴科夫斯基的第一钢琴协奏曲，拿曲子也别好，前面前奏特别的激情、气势，然后是那种很浓重的深情和大气。要是古代诗歌的话可以考虑一些古代的曲子，比如凤求凰阿，高山流水阿，春江花月夜阿，毕竟古琴古筝的音色是很不错的~~
慢慢选……………………………………………………………………………………

老师认为英语单词的记忆对于英语初学者来说是一个很大的障碍,尤其是英语新教材的实施后,对英语单词的记忆又提出了更高的要求,尽量不要死记硬背.
你可以尝试一下下面的方法：
1. 一边背单词一边把单词大声朗读出来. -
我们都有过这样的经验,当老师在用英语听写单词时,有很多自己并不知道的单词也可以照着读音写出正确的拼法.这是因为绝大多数的单词是可以听音写出来的,不规则的单词很少.可以这么说,如果你记住了单词的发音,再过几遍,就可以拼出80%的单词,这一点也不夸张.一些同学没有体会到这一点,他们背单词的方法就是一本书,一叠纸和一支笔,狂练拼写.显然,这样做既枯燥又低效.记住,要背单词,第一的要诀就是把它正确的读出来,然后你可以按照读音规则进行拼写.这样一举两得,既背会了单词,又练会了单词的发音,为将来能讲一口流利而纯正的英语打下了良好的基础. -
2. 要不断地结合语境边学边练. -
人与人交往的最基本单位是句子而不是单词.只有学以致用,真正将所学单词用于日常生活、学习、工作环境中,只有能随心所欲的使用所学新单词、新语句与他人交流,才能算真正掌握了单词.记住了单词在某一语境中的用法,不但可以在遇到此情况时可熟练地运用此单词,还可以举一反三,将此单词用在相似的语境中,从而真正掌握单词的用法,达到活学活用的目的. -
3. 背单词时不要一次在某一个单词上花的时间太多. -
一个单词一次只要背上几遍,十几遍即可,但是背过之后要不断地复习,特别是在脑子里复习.在脑子里多过几遍是非常重要的.另外还要不断地找机会使用,就可以将之牢牢地记在脑海里. -
4. 要注意单词之间的联系. -
当然,可能刚开始时能建立联系的单词很少,但要注意培养这种意识,争取一串串地背单词,看见一个,就能想起一串.比如,同义的、反义的、形似的-、同类的、同根的单词放在一块儿记.背单词一段时间之后,看到一个单词,就可以想一想以前学过什么同义的,如果只有印象而想不起来,最好在笔记本上记一笔,下次碰到时,特别注意.再比如,背单词一段时间后,你看到了一个新单词tuxedo(礼服),你就应该问自己：我一共学了多少关于衣服的词?也可以几个人比一比,看谁写出的动物/植物/食物.

Most of my classmates like robots. So do I.

是我大学一年级时,一起参加蒙面舞会的一位女生的眼神给我留下了偶尔想起就心生怜爱的印象.由于面具蒙着面,只有面具眼眶周围有大大的圆圈能看到她的眼睛——而就是这心灵的窗户却让我寻找了四年,也许还会更长……闪亮的灯光洒在她的脸上,而我却只能盯住她的眼睛,那里放佛有一种吸引我的磁力一般.大眼睛闪闪的,月光映在里面清澈明亮,略略带着点对面前陌生人的惶恐,放佛能透过去看到心里的某些小委屈,稍稍一低头,眼神里眯了一下,放佛看到了一丝动人的娇羞……

解题思路：根据单质（金属单质、固态非金属单质、稀有气体单质，直接用元素符号表示其化学式；气态非金属单质，在元素符号的右下角写上表示分子中所含原子数的数字）和化合物（金属在前，非金属在后；氧化物中氧在后，原子个数不能漏，正负化合价代数和为零）化学式的书写方法进行分析解答即可．

五氧化二磷的化学式为：P₂O₅．
氧气属于气态非金属单质，在元素符号的右下角写上表示分子中所含原子数的数字，其化学式为：O₂．
氧化镁中镁元素显+2价，氧元素显-2价，其化学式为MgO．
过氧化氢的化学式为：H₂O₂．
故答案为：P₂O₅；O₂；MgO；H₂O₂．

点评：
本题考点： 化学式的书写及意义．

考点点评： 本题难度不大，掌握单质和化合物化学式的书写方法是正确解答此类题的关键．