【正文】 in Los early reply will be highly help you give me is sincerely hope everything will be well with let us know if you want more hope you always enjoy wish you every success in the ing ？？、？？？？？？？？？？？？ remember me to your best regards to your the love and good : Dear : Dear Sir or Madam: Dear Smith: Dear plimentary closings: Sincerely yours, Cordially yours,(Cordially, or Sincerely, alone may be used if we address the reader by his first name。留言涉及的方面很多，包括約會(huì)，通知，請(qǐng)求等任何可用便條留下的口信。所以，請(qǐng)假條大多是病假條。寫假條最重要的是說(shuō)明原因和請(qǐng)假的期限。條據(jù)上需寫明錢物名稱和數(shù)量、立據(jù)人及日期。, 2002 Borrowed from the Foreign Language Department Reference Library three books as follows: A copy of English History and Anthology of English Literature by Wu Weiren，a copy of A Survey of American Literature by Chang Yaoxin，and a copy of World Literature by Jiang Zhuo From the Office of Social Science Department 真的不掉線嗎？？、？？？？？？？？？？？？H+1價(jià)，O2價(jià)Ca、Mg、Ba、Zn、Cu均為+2價(jià)Al是+3價(jià)F、Cl、Br、I是1價(jià)NH4是+1價(jià) OH、NOHCO3是1價(jià)SOCOSO3是2價(jià)PO4是3價(jià)由原子直接構(gòu)成的物質(zhì)有：金屬單質(zhì)（如：鐵Fe、鈉Na等）、稀有氣體單質(zhì)（:如氦氣He、氖氣Ne、氬氣Ar等），部分固態(tài)非金屬單質(zhì)（如：碳C、磷P、硫S、硅Si等）真的不掉線嗎？？、？？？？？？？？？？？？模型與符號(hào) 原子、分子和離子，元素符號(hào)下列選項(xiàng)屬于模型的是（）A、H2O B、表示方向的指向標(biāo) C、電流I D、沙盤中的校園下圖是碳酸分子分解的示意圖，請(qǐng)你從宏觀、微觀方面寫出獲得的信息。由于 所帶正電和 所帶負(fù)電，電量相等，電性相反，所以原子顯電 性第一個(gè)提出原子概念的人是 ；第一個(gè)發(fā)現(xiàn)電子的人是固態(tài)碘、碘溶液和碘蒸氣中都存在碘分子，饅頭遇到固態(tài)碘、碘溶液和碘蒸氣都能變藍(lán)色這一實(shí)驗(yàn)現(xiàn)象說(shuō)明（）A 分子始終在做無(wú)規(guī)則運(yùn)動(dòng) B 分子之間存在空隙C 分子之間存在引力和斥力 D 分子是保持物質(zhì)化學(xué)性質(zhì)的一種微粒下面有關(guān)分子的正確說(shuō)法是（）①分子由原子構(gòu)成；②分子是由一種原子構(gòu)成的；③分子是由不同的原子構(gòu)成的； ④分子構(gòu)成了所有物質(zhì)；⑤分子是構(gòu)成物質(zhì)的微粒之一。每個(gè)H2O2分子是由（）A 氫原子和氧原子組成 B 一個(gè)氫分子和一個(gè)氧分子構(gòu)成C 氫元素和氧元素組成 D 兩個(gè)氫分子和兩個(gè)氧原子構(gòu)成1關(guān)于二氧化硫、二氧化碳、二氧化錳、氧氣四種物質(zhì)的說(shuō)法正確的是()A、都含有氧分子 B、氧元素的化合價(jià)都相同C、都是氧化物 D、都含有氧元素1下列關(guān)于原子的說(shuō)法錯(cuò)誤的是（）真的不掉線嗎？？、？？？？？？？？？？？？A、原子是化學(xué)變化中的最小粒子 B、原子在不斷地運(yùn)動(dòng)C、有些物質(zhì)是由原子直接構(gòu)成的 D、原子是不可再分的粒子1滿足下列條件的原子能夠和氕原子互稱同位素的是，中子數(shù)為2 B．質(zhì)子數(shù)為2，中子數(shù)為1 ，電子數(shù)為l D．質(zhì)子數(shù)為2，電子數(shù)為11下列敘述正確的是()A、湯姆生建立的“湯姆生模型”認(rèn)為原子核像太陽(yáng)，電子像行星繞原子核運(yùn)行B、盧瑟福建立的“盧瑟福模型”認(rèn)為電子像云霧一樣出現(xiàn)在原子核周圍C、波爾建立的“分層模型”認(rèn)為電子在原子核周圍分層運(yùn)動(dòng)第二篇：歷年四級(jí)寫作真題專四輔導(dǎo)之便條寫作（一）便條的寫作便條是一種簡(jiǎn)單的書信形式。便條的特點(diǎn)在于內(nèi)容簡(jiǎn)短，大多是臨時(shí)性的詢問(wèn)、留言、通知、要求等。有急事需要告訴別人而又不能面談時(shí)，就可以寫便條，如請(qǐng)假條、留言條等。結(jié)尾時(shí)也無(wú)需要結(jié)尾禮詞，只需要寫上便條者姓名。但一般不寫年份，因?yàn)楸銞l的內(nèi)容多半是當(dāng)日或近日內(nèi)要辦的事情。基本寫作格式便條內(nèi)容和類型不盡相同，可以靈活變通。分類舉例1）請(qǐng)假（Asking for Leave）例1 Directions: You are about to write a Business Leave Note of about 100 describe the information )the reason you ask for the leave 2)the time and how long you will leave Secretary Li, I’m sorry to apply for ten days’ leave from the to I have to leave with the time is father now in the hospital is badly have to go to see him and take care of him for a few know I’m the only child in my course I will show you the telegram about my father’s illness which is received from my mother to support my concern as the missed lessons during my absence, I promise I will do my best to catch them on after I e back to the for your respectfully， 本文是一封請(qǐng)假條，一般我們要向上級(jí)或老師請(qǐng)假，通常用的是ask for leave這個(gè)短語(yǔ)，請(qǐng)三天假可寫作：ask for three days’ leave。例2 Directions: Your father is seriously ill, and you want to go back a note to the secretary and it should include 1)the cause for leaving。3)Catch on the lesson after returning 5th Dear Miss Huang, My sister called me last night, and she said that my father is dangerously beg to apply for seven days’ leave of absence from 16th to 21st instant, in order that I can see my beloved should be much obliged if you would grant me my regards the lessons to be missed during my absence, I will do my best to make up for them as soon as I get back from yours， I should be much obliged if you would...是一種客套語(yǔ)，表示“……，我當(dāng)不勝感激。2)約請(qǐng)(Invitation)Directions: You have a ticket to the Russian National Ballet Troupe, which is visiting and you want to give it to your friend a note to her and say: 1)the time of the show, 2)the place where you will wait for Dear Alice, Here is a piece of good news for Russian National Ballet Troupe, which is now on a visit in Beijing, will give a performance in the Beijing Grand Theater tomorrow am sure that you will be happy to watch I leave you an admission performance will begin at seven o’clock will wait for you at the theater let me know whether you are prevented from ing or not. 約朋友一起去看戲，可是朋友不在家，只好留下票子和一張便條，但又怕朋友來(lái)不了，所以在便條最后特地寫上“如果你來(lái)不了，告訴我一聲”（Please let me know whether you are prevented from ing）3)道歉（Apology）人非圣賢，孰能無(wú)過(guò)。如果發(fā)生此類事情，就會(huì)給對(duì)方帶來(lái)麻煩和不便。此類信要寫得及時(shí)，態(tài)度要誠(chéng)懇，用詞需謙遜。例1 Directions: You have missed a date of your friend, now you have to write a letter for appologization in about 100 20th Dear Lily, I am sorry I missed seeing you know that you must have been also feel worried and anxious in my fact is that my manager at the last moment asked me to prepare a urgent plan while I could not get to a phone to call you and yesterday I have worked late until about 8:30 am terribly , I would like to ask you out this weekend to make up for give me a chance and I am waiting for your reply. 臨時(shí)有事未能赴約，一定要把事情解釋清楚并真誠(chéng)的道歉，最好能有彌補(bǔ)（to make up），邀請(qǐng)對(duì)方周末再碰頭（I would like to ask you out this weekend）注意句子you must have been disappointed中情態(tài)動(dòng)詞的用法：情態(tài)動(dòng)詞+完成時(shí)態(tài)，表示過(guò)去行為。例2 Directions: You have received a invitation from your friend, but you have already had some guests in your express the reason you can’t go clearly in about 100 Dear Lucy, I do apologize for having to send this letter about Saturday I accepted your invitation, I simply forgot that Saturday was a holiday and that my own guests were not leaving until Sunday is difficult for me to make a I also wonder to meet you very could not very well go out by myself and leave the guests at my hope you know how sorry I am not to be with you this I make a visit to you in my other spare time? Thank you very much. 自己家里有客人，自然不方便再接受別人邀請(qǐng)去做客所以可以明正言順的表示拒絕或可另約時(shí)間。英國(guó)人一般把“打電話”說(shuō)成to ring somebody up，還可以說(shuō) to give somebody a ring，不要錯(cuò)以為別人要送你個(gè)戒指。與別人已經(jīng)定好的約會(huì)卻臨時(shí)不能赴約時(shí)，應(yīng)說(shuō)明原因并誠(chéng)懇地道歉，以期獲得別人的諒解?！坝绊憽庇幸粋€(gè)很地道的短語(yǔ)。5）回復(fù)友人問(wèn)候(Reply for Regards)Directions: You have just had an operation, and received a note of regards from your friend please write a reply to her to tell her your current Jenny, Thanks for your letter of sympathy I received the day before operation on my leg was a wonderful know I