【明確】“一夫當(dāng)關(guān),萬(wàn)夫莫開(kāi)”言劍閣有易守難攻的險(xiǎn)要形勢(shì),暗示中央朝廷的部隊(duì)很不容易打進(jìn)來(lái),因而野心家可以據(jù)險(xiǎn)發(fā)動(dòng)叛亂,“化為狼與豺”,搞地方割據(jù)。如果割據(jù)勢(shì)力之間出現(xiàn)矛盾沖突,難免要發(fā)生混戰(zhàn),結(jié)果必定是“殺人如麻”。詩(shī)人這番預(yù)言在十多年后就得到了證實(shí):從上元二年到大歷初即有段子璋、徐知道、崔旰等人相繼發(fā)動(dòng)叛亂。詩(shī)人的意圖是要嚴(yán)防野心家發(fā)難。詩(shī)人從劍閣的險(xiǎn)要引出對(duì)政治形勢(shì)的描寫。他化用西晉張載《劍閣銘》中形勝之地,匪親勿居的語(yǔ)句,目的在于勸人引以為鑒戒,警惕戰(zhàn)亂的發(fā)生,并聯(lián)系當(dāng)時(shí)的社會(huì)背景,揭露了蜀中豺狼的磨牙吮血,殺人如麻,這既是描寫蜀道猛獸,又是影射政治黑暗的雙關(guān)語(yǔ)句,表達(dá)了對(duì)國(guó)事的憂慮與關(guān)切,為詩(shī)篇增加了現(xiàn)實(shí)的內(nèi)涵、深厚的意蘊(yùn)。唐天寶初年,太平景象背后正潛伏著危機(jī),后來(lái)發(fā)生的安史之亂,證明詩(shī)人的憂慮是有現(xiàn)實(shí)意義的。
(2)個(gè)性化的對(duì)話描寫。在三個(gè)事件的描述中,大段對(duì)話占了很大篇幅,有的情節(jié)干脆由對(duì)話來(lái)表達(dá),許多對(duì)話形象地表現(xiàn)了人物的思想和性格,使我們?nèi)缏勂渎暎缫?jiàn)其人。先說(shuō)藺相如,他在秦廷上的慷慨陳詞,有時(shí)語(yǔ)氣平和,謙恭有禮,使對(duì)方放松警惕;有時(shí)直言斥責(zé),有理有據(jù),雄辯折人;有時(shí)堅(jiān)決表態(tài),分析利害,暗示對(duì)方;有時(shí)怒不可遏,咄咄逼人。總之,詞鋒犀利,剛?cè)峒媸?,而又輕重恰當(dāng),充分表現(xiàn)了他是一個(gè)熱愛(ài)祖國(guó)、不畏強(qiáng)暴、有智有勇,長(zhǎng)于辭令的外交家。再說(shuō)廉頗,在將相交歡事件中,他先前說(shuō)的這一番話,表現(xiàn)了他的自高自大和心胸狹窄,非常符合武將廉頗的性格特點(diǎn),后來(lái)寫他知過(guò)改過(guò),負(fù)荊請(qǐng)罪時(shí)說(shuō):“鄙賤之人,不知將軍寬之至此也!”語(yǔ)言不多,坦誠(chéng)直率,可敬可愛(ài)。(解說(shuō):對(duì)話描寫的分析,宜以學(xué)生為主,教師必要時(shí)適當(dāng)點(diǎn)撥。)
【教學(xué)目標(biāo)】1.理解作者反抗黑暗,辭官歸田,不與當(dāng)時(shí)黑暗的上層社會(huì)同流合污而熱愛(ài)田園生活的積極精神,學(xué)習(xí)其高潔的理想志趣和堅(jiān)定的人生追求。2.掌握“胡、奚、曷、焉、何”五個(gè)疑問(wèn)代詞,歸納“行、引、乘、策”等四個(gè)詞的一詞多義,了解“以、而、之、兮、來(lái)”等文言虛詞的用法。3.背誦全文?!窘虒W(xué)重點(diǎn)】1.了解作者辭官歸田的原因,深刻體味詩(shī)人鄙棄官場(chǎng),熱愛(ài)田園的無(wú)限欣喜之情。2.背誦全文?!窘虒W(xué)難點(diǎn)】1.理解記述中滲透出的或喜或哀,或決絕或猶疑的復(fù)雜感情。2.歸納實(shí)詞、虛詞的用法,掌握省略句、倒裝句兩種句式?!窘叹邷?zhǔn)備】投影儀投影膠片【課時(shí)安排】2課時(shí)【教學(xué)過(guò)程】第一課時(shí)[教學(xué)要點(diǎn)]了解陶淵明及其作品。讀課文,利用注釋、工具書,初步把握文章,朗讀課文,找出押韻的字,由押韻歸納各層大意,幫助學(xué)生理清背誦思路,背誦全文。[教學(xué)步驟]一、導(dǎo)語(yǔ)《桃花源記》是我們?cè)诔踔薪佑|過(guò)的陶淵明的作品。師生一同背誦?!短一ㄔ从洝分杏崎e自得的田園生活正是作者精神追求的形象反映。今天我們學(xué)習(xí)的《歸去來(lái)兮辭》正是作者決別官場(chǎng),同上層社會(huì)分道揚(yáng)鑣的宣言書。
三.分析第三部分:1.夫妻贈(zèng)詩(shī)表現(xiàn)了二人怎樣的心情?提示:崔鶯鶯告誡張生切勿忘記她;張生則發(fā)誓永無(wú)別戀。這充分展示了二人深厚的情誼。2.怎樣理解[耍孩兒]中的典故?提示:“紅淚”借王嘉《拾遺記》的典故,司馬青衫借白居易《琵琶行》的典故,表現(xiàn)主人公因離別而生的傷心之情?!安畡陲w去燕西歸”則用牛郎織女的典故表現(xiàn)兩人纏綿難舍的心情。3.[五煞]表明了主人公怎樣的心情?提示:對(duì)張生的生活的關(guān)心,千叮萬(wàn)囑,真情自現(xiàn)。4.[二煞]中所用是幾個(gè)典故?這些典故的作用是什么?提示:三個(gè)典故,見(jiàn)課本。其作用是表明崔鶯鶯對(duì)張生的擔(dān)心。四.分析第四部分:1.[一煞]中再寫環(huán)境,其作用是否與先前所寫相同?提示:稍有不同,這里是表現(xiàn)崔鶯鶯目送張生遠(yuǎn)去時(shí)那種凄愴悲苦的眷戀之情。以所見(jiàn)之物,寫內(nèi)心深藏之情。2.[收尾]中寫‘殘照’其含義是什么?提示:以“殘照”表現(xiàn)內(nèi)心的悵惘失意之情。
六、到此為止,我們了解到,作者對(duì)“笑”鯤鵬和別人的蜩與學(xué)鳩、斥鴳、宋榮子都一一作了否定。那么請(qǐng)大家討論一下,1、作者對(duì)鯤鵬和“知效一官,行比一鄉(xiāng),德合一君,而征一國(guó)者”是不是肯定呢?明確:也都作了否定。否定后者好理解,關(guān)鍵是否定前者不好理解,因?yàn)椤蚌H鵬展翅”早已作為積極的意象被人們廣泛引用。但在本文中,作者在講述這一寓言故事時(shí),突出的不是鯤鵬本身,而是風(fēng)力,“故九萬(wàn)里,風(fēng)斯在下矣,而后乃今培風(fēng);背負(fù)青天,而莫之夭閼者,而后乃今將圖南”。對(duì)風(fēng)力作用的突出,實(shí)際上就是對(duì)鯤鵬的否定。作者寫了“笑”的雙方,對(duì)“笑”的一方蜩與學(xué)鳩、斥鴳、宋榮子都作了否定,對(duì)被“笑”的一方鯤鵬和“知效一官,行比一鄉(xiāng),德合一君,而征一國(guó)者”也都作了否定,并且對(duì)順便提及的野馬、塵埃、芥、大舟、朝菌、蟪蛄、冥靈、大椿、彭祖、列子等事物或者人物也都作了否定。這種全盤否定的態(tài)度,如果我們借用本文中的一個(gè)形象的詞語(yǔ),可以說(shuō)是:笑!是的,本文也可以說(shuō)是:莊子“笑”萬(wàn)物!
教學(xué)目標(biāo):1、知識(shí)與能力:(1)識(shí)記:理性、啟蒙運(yùn)動(dòng);伏爾泰、孟德斯鳩、盧梭等偉大的啟蒙思想家及其主張;康德及啟蒙運(yùn)動(dòng)的影響;(2)理解啟蒙運(yùn)動(dòng)興起的背景,分析啟蒙思想的巨大影響;(3)認(rèn)識(shí)上層建筑對(duì)社會(huì)發(fā)展的巨大反作用。2、過(guò)程與方法:(1)指導(dǎo)學(xué)生用表格法掌握啟蒙運(yùn)動(dòng)主要代表人物及其思想主張;(2)運(yùn)用比較法加深對(duì)啟蒙思想家觀點(diǎn)共性和個(gè)性的認(rèn)識(shí)。(3)運(yùn)用比較法對(duì)比文藝復(fù)興和啟蒙運(yùn)動(dòng)的異同,說(shuō)明啟蒙運(yùn)動(dòng)對(duì)人文主義思想的發(fā)展。3、情感態(tài)度與價(jià)值觀:(1)通過(guò)本課的學(xué)習(xí),讓學(xué)生認(rèn)識(shí)到“一定的文化是一定社會(huì)的政治和經(jīng)濟(jì)在觀念上和形態(tài)上的反映”;(2)學(xué)習(xí)啟蒙思想家追求真理的精神,培養(yǎng)學(xué)生遠(yuǎn)大的理想與抱負(fù);(3)通過(guò)法國(guó)啟蒙思想產(chǎn)生的巨大影響的分析,使學(xué)生認(rèn)識(shí)意識(shí)形態(tài)對(duì)社會(huì)發(fā)展所起的重大作用,從而提高學(xué)習(xí)理論的自覺(jué)性。
The listening and speaking part aims at how to protect and help endangered animals by listening, speaking and talking about the facts and reasons. This lesson analyzes the decreasing clause of Tibetan antelope population and the measures of protecting Tibetan antelopes. So students can be guided to learn to analyse the title and use different reading skills or strategies, like scanning, skimming and careful reading.1. Read quickly to get the main ideas and the purpose of going to Tibetan; read carefully to understand what the author see and think.2. Understand the sentences of the present continuous passive voice such as “Much is being done to protect wildlife.” and the inverted sentence “Only when we learn to exist in harmony with nature can we stop being a threat to wildlife and to our planet.”3. Enhance the awareness of protecting wildlife.4. Cultivate the reading methods according to different materials.1. Read quickly to get the main ideas and the purpose of going to Tibetan; read carefully to understand what the author see and think.2. Understand the sentences of the present continuous passive voice such as “Much is being done to protect wildlife.” and the inverted sentence “Only when we learn to exist in harmony with nature can we stop being a threat to wildlife and to our planet.”3. Cultivate the reading methods according to different materials.Step 1 Leading-inWatch a video about elephants and whales and then ask:Why are they endangered ? They are killed/hunted
Listening and Speaking introduces the topic of “ask about online habits”. Many middle school students have been surfing the Internet for many years, but what they do with the Internet and how much time they spend every day may not be very clear to themselves, nor to other students. This section allows students to investigate their peers' Internet use, which is conducive to their mutual understanding and understanding of the Internet. It can also help them reflect on their own online behavior, learn from other people's good online habits, and get rid of their bad online behavior.The listening text of this section is an investigation interview. The investigators interview specific groups with the same questions to obtain information, so as to understand their views, practices or attitudes on this issue. There are two specific questions: “how much time do you spend online every day? What do you usually do online?”. The answers of the three respondents provide rich and different information, and achieve the purpose of the investigators. The oral discourse structure of survey interviews generally includes greeting and explaining the purpose of the interview, presenting the interview questions and the respondents' answers. Listening and Talking introduces the theme of “choosing the right application ". Listening text is a conversation between Laura and Xiao Bo. In this part of listening, “oink”; “piggy bank” may cause the students' hearing comprehension limitation. Oink refers to sound word and pig's sound. So, add some oink to my piggy bank is often used to describe "making a little money".1. Guide students to understand the content of listening texts in terms of listening for definitions.2. Cultivate students' ability to define words and understand an investigation interview.
Step 5 While reading---Task 3Read the text again and answer the following questions.Q1: How many countries does the UK consist of ?4 Q2: What are the four countries of the United Kingdom?England, Wales, Scotland and Northern Ireland Q3: Which two were the first to be joined together ?England and WalesQ4: What are the two chief advantages of studying the history of a country ?The first one is to help you understand more about the country and its traditions.The second one is to make visiting it more enjoyable.Q5: What’s the author’s attitude towards studying the history ?Supportive/positiveStep 6 Post reading---Retell the textThe United Kingdom, Great Britain, Britain, England—many people are confused by (1)_____ these different names mean. In the 16th century, the nearby country of Wales (2) __________(join) to the Kingdom of England. In the 19 th century, the Kingdom of Ireland was added to create the United Kingdom of Great Britain and Ireland. Finally, the southern part of Ireland (3) ______ (break) away from the UK, which resulted in the full name we have today. However, most people just use the (4)_________(shorten) name: the UK. The four countries (5)__________ belong to the United Kingdom work together in some areas. There were four sets of invaders and the last group were the Normans. They had castles (6)_________(build) all around England and made changes (7)__________ the legal system. Studying the history of the country will make your visit much more (8)_________(enjoy). The capital city London is (9)___ ancient port city that has a history (10)______(date) back to Roman times. 1. what 2.was joined 3.broke 4.shortened 5.that 6. built 7.to 8.enjoyable 9.an 10.dating Step 6 Homework
This lesson is about music. Students can classify the types of music through the instruments and its sound and can talk about their preferences about music, even join some activities and play a role in them according to their musical talents. On the basis, they are guided to use the languages to express their preferences and some plosive sounds and their rules.1. Classify the music types through the instruments and its sound.2. Listen and understand what the speakers’ preferences are and the reasons; talk about their own preferences and give their own reasons, using these sentences: “What kind of music do you like? And why? “ “Because it makes/gives me energy/peaceful.../touches my heart...”.3. Learn some plosives and the rules.4. Join some activities and play a role in them according to the talents. 1. Listen and understand what the speakers’ preferences are and the reasons;2. talk about their own preferences and give their own reasons, using these sentences: “What kind of music do you like? And why? “ “Because it makes/gives me energy/peaceful.../touches my heart...”.3. Learn some plosives and incomplete plosives and its rules.Step 1 Lead inPoint at the pictures on P50 and ask Q1: What are the people doing in the pictures below?Q2: What kind of music they are?Then play the MP3s one by oneStep 2 ListeningTask 1: A reporter from the school newspaper is interviewing students about music. Listen to the interviews. Draw lines between the words to make complete sentences. Some words will not be used.
1.改善城市環(huán)境:治理河流、控制大氣污染物、大力加強(qiáng)綠化建設(shè)為改善城市環(huán)境,上海市全面展開(kāi)對(duì)大氣、河流、噪聲等多方面的治理工作。如蘇州河的治理、降低城市污染物濃度、加強(qiáng)綠化建設(shè),截止1990年,市區(qū)綠化覆蓋率達(dá)到20.3%。2.改善城市交通、改善居住條件擴(kuò)寬主干道,修建環(huán)城公路,修筑了南浦大橋和揚(yáng)浦大橋,新修城市高架公路和地鐵,改造住宅。3.控制城市規(guī)模建立衛(wèi)星城,開(kāi)發(fā)新區(qū),有效地控制城市中心區(qū)的規(guī)模。思考:什么時(shí)候許多國(guó)家采取措施保護(hù)和改善城市環(huán)境?你認(rèn)為可以采取哪些措施來(lái)保護(hù)和改善城市環(huán)境?上海市保護(hù)和改善城市環(huán)境的措施:上海的衛(wèi)星城有哪些?上海新建了哪個(gè)新區(qū)?目前浦東新區(qū)在上海的地位如何?建立衛(wèi)星城和開(kāi)發(fā)新區(qū)可以起到什么作用?上海市為改善交通條件,做了哪些工作?
過(guò)渡:在實(shí)際生活中,城市內(nèi)部空間結(jié)構(gòu)并非完全按照這一經(jīng)濟(jì)規(guī)律呈現(xiàn),而是更具復(fù)雜性。這說(shuō)明除了經(jīng)濟(jì)因素外,還有很多其他因素在起作用,請(qǐng)大家結(jié)合你的認(rèn)識(shí)、圖2.9和案例1:紐約市的少數(shù)民族區(qū)談?wù)勀愕目捶?。?)其他因素I收入——形成不同級(jí)別住宅區(qū)的常見(jiàn)原因。有能力支付昂貴租金和選擇最佳居住環(huán)境的人,其居住地往往形成高級(jí)住宅區(qū)。II知名度——城市內(nèi)某些地區(qū)在歷史、文化或經(jīng)濟(jì)方面具有很高的聲譽(yù),這往往會(huì)吸引更多新的住宅或商場(chǎng)建在該處,以提高其知名度。III種族聚居區(qū)的形成——在有些城市的某一區(qū)域內(nèi),如果某個(gè)種族或宗教團(tuán)體占優(yōu)勢(shì),就可能形成種族聚居區(qū)。如紐約市的唐人街、哈林區(qū)、小意大利區(qū)等。IV歷史因素——城市的建筑物和街道設(shè)計(jì)可以維持久遠(yuǎn),早期的土地利用方式對(duì)日后的功能分區(qū)有著深遠(yuǎn)的影響。
1.歸納珠江三角洲發(fā)展基塘生產(chǎn)有利的地理?xiàng)l件。珠江三角洲地勢(shì)低平,河網(wǎng)密布,降水充沛。北回歸線從珠江三角洲的北部穿過(guò)。珠江三角洲地區(qū)發(fā)展基塘農(nóng)業(yè)生產(chǎn)有利條件可以結(jié)合材料,歸納為三個(gè)方面:地形、氣候、市場(chǎng)(當(dāng)?shù)睾秃M猓?.基塘生產(chǎn)將哪些產(chǎn)業(yè)聯(lián)系起來(lái)?哪些副產(chǎn)品(或廢棄物)被充分利用起來(lái)?這種聯(lián)系對(duì)農(nóng)村經(jīng)濟(jì)發(fā)展有什么作用?基塘生產(chǎn)環(huán)節(jié)將種植業(yè)(桑、蔗等)、養(yǎng)殖業(yè)(養(yǎng)蠶、養(yǎng)魚(yú))、工業(yè)(絲廠、糖廠)等幾種產(chǎn)業(yè)緊密的聯(lián)系在一起。在此環(huán)節(jié)中,塘泥、蠶沙(蠶屎)、蠶蛹、繅絲、濾泥、蔗葉等副產(chǎn)品被充分的回收利用。養(yǎng)蠶業(yè)、蔗糖加工業(yè)同塘魚(yú)養(yǎng)殖業(yè)緊密結(jié)合,作為一種綜合的經(jīng)營(yíng),幾者之間相互依存、相互促進(jìn)、揚(yáng)長(zhǎng)補(bǔ)短,有機(jī)地循環(huán)聯(lián)系起來(lái)?;旧辖鉀Q了桑、蔗的肥料和蠶、魚(yú)的飼料問(wèn)題。不僅養(yǎng)蠶、蔗糖加工和養(yǎng)魚(yú)生產(chǎn)穩(wěn)定,而且成本也大大降低。
隨著社會(huì)生活現(xiàn)代化進(jìn)程的加快,現(xiàn)代生活給幼兒帶來(lái)的危險(xiǎn)日益突出,像火災(zāi)、溺水、拐騙、突發(fā)事件等一系列危險(xiǎn)時(shí)刻威脅著年幼的孩子。幼兒生活經(jīng)驗(yàn)少,自我保護(hù)能力差,極易受到傷害,因此,對(duì)幼兒進(jìn)行自我保護(hù)教育和學(xué)習(xí)處理一些突發(fā)事件十分必要。與其整天把幼兒看管得緊緊的,不如教會(huì)他們必要的安全知識(shí)。鑒于此,我除了在日常生活中注意對(duì)孩子進(jìn)行這方面的隨機(jī)教育外,覺(jué)得有必要組織一次專門的教育活動(dòng),對(duì)孩子進(jìn)行教育,讓幼兒掌握正確的報(bào)警知識(shí)。小班幼兒缺乏生活經(jīng)驗(yàn)和自我保護(hù)能力,在日常生活中很容易發(fā)生意外傷害,雖然知道了一些急用電話,但還不會(huì)正確使用,根據(jù)小班幼兒的這些特點(diǎn),我為本活動(dòng)定出了兩條教育目標(biāo):第一,了解警車、救護(hù)車、消防車與人們生活的關(guān)系。第二,知道電話110、120、119的作用,懂得在危急時(shí)撥打相應(yīng)的電話號(hào)碼。
一、描述圓周運(yùn)動(dòng)的物理量 探究交流 打籃球的同學(xué)可能玩過(guò)轉(zhuǎn)籃球,讓籃球在指尖旋轉(zhuǎn),展示自己的球技,如圖5-4-1所示.若籃球正繞指尖所在的豎直軸旋轉(zhuǎn),那么籃球上不同高度的各點(diǎn)的角速度相同嗎?線速度相同嗎? 【提示】 籃球上各點(diǎn)的角速度是相同的.但由于不同高度的各點(diǎn)轉(zhuǎn)動(dòng)時(shí)的圓心、半徑不同,由v=ωr可知不同高度的各點(diǎn)的線速度不同.
①平動(dòng)的物體一般可以看作質(zhì)點(diǎn)做平動(dòng)的物體,由于物體上各點(diǎn)的運(yùn)動(dòng)情況相同,可以用一個(gè)點(diǎn)代表整個(gè)物體的運(yùn)動(dòng),在這種情況下,物體的大小、形狀就無(wú)關(guān)緊要了,可以把整個(gè)物體當(dāng)質(zhì)點(diǎn)。例如:平直公路上行駛的汽車,車身上各部分的運(yùn)動(dòng)情況相同,當(dāng)我們把汽車作為一個(gè)整體來(lái)研究它的運(yùn)動(dòng)的時(shí)候,就可以把汽車當(dāng)作質(zhì)點(diǎn)。當(dāng)然,假如我們需要研究汽車輪胎的運(yùn)動(dòng),由于輪胎上各部分運(yùn)動(dòng)情況不相同,那就不能把它看作質(zhì)點(diǎn)了。要注意的是:同一物體在不同情況下有時(shí)可看質(zhì)點(diǎn),有時(shí)不可以看作質(zhì)點(diǎn),一列火車從北京開(kāi)到上海,研究火車的運(yùn)行的時(shí)間,可將火車看成質(zhì)點(diǎn),而火車過(guò)橋時(shí),計(jì)算火車過(guò)橋的時(shí)間,不可以將火車看成質(zhì)點(diǎn)。②有轉(zhuǎn)動(dòng)但轉(zhuǎn)動(dòng)為次要因素例如:研究地球公轉(zhuǎn)時(shí),可把地球看作質(zhì)點(diǎn);研究地球自轉(zhuǎn)時(shí),不能把地球看作質(zhì)點(diǎn)。③物體的形狀、大小可忽略再如:乒乓球旋轉(zhuǎn)對(duì)球的運(yùn)動(dòng)的較大的影響,運(yùn)動(dòng)員在發(fā)球、擊球時(shí)都要考慮,就不能把乒乓球簡(jiǎn)單看作質(zhì)點(diǎn)。
(創(chuàng)設(shè)實(shí)例:多媒體播放視頻劉翔的110m欄。)1.提出問(wèn)題:怎樣定量(準(zhǔn)確)人描述車或劉翔所在的位置?2.提示:你的描述必須能反映物體(或人)的運(yùn)動(dòng)特點(diǎn)(直線)、運(yùn)動(dòng)方向、各點(diǎn)之間的距離等因素。3.總結(jié):①為了定量地描述物體的位置及位置的變化,需要在參考系上建立適當(dāng)?shù)淖鴺?biāo)系。坐標(biāo)系是在參考系的基礎(chǔ)上抽象出來(lái)的概念,是抽象化的參考系。為了定量地描述物體的位置及位置的變化需要在參考系上建立適當(dāng)?shù)淖鴺?biāo)系,如果物體在一維空間運(yùn)動(dòng),即沿一條直線運(yùn)動(dòng),只需建立直線坐標(biāo)系,就能準(zhǔn)確表達(dá)物體的位置;如果物體在二維空間運(yùn)動(dòng),即在同一平面運(yùn)動(dòng),就需要建立平面直角坐標(biāo)系來(lái)描述物體的位置;當(dāng)物體在三維空間運(yùn)動(dòng)時(shí),則需要建立三維坐標(biāo)系。①一維坐標(biāo):描述物體在一條直線上運(yùn)動(dòng),即物體做一維運(yùn)動(dòng)時(shí),可以以這條直線為x軸,在直線上規(guī)定原點(diǎn)、正方向和單位長(zhǎng)度,建立直線坐標(biāo)系。如圖1-1-1所示,若某一物體運(yùn)動(dòng)到A點(diǎn),此時(shí)它的位置坐標(biāo)XA=3m,若它運(yùn)動(dòng)到B點(diǎn),則此時(shí)它的坐標(biāo)XB=-2m(“-”表示沿X軸負(fù)方向)。
1. 課前觀看視頻《物理學(xué)與人類文明》2. 分組討論,派代表發(fā)言,談學(xué)習(xí)感受。主要是物理的地位,物理的學(xué)習(xí)方法。3. 高中物理與初中物理在內(nèi)容和方法上的區(qū)別高中物理除了現(xiàn)象、概念和規(guī)律之外還應(yīng)該關(guān)注研究問(wèn)題的方法,學(xué)會(huì)從先想到抽象,從定性到定量研究問(wèn)題,學(xué)會(huì)用數(shù)學(xué)方法解決物理問(wèn)題,學(xué)會(huì)實(shí)驗(yàn)探究,學(xué)會(huì)獨(dú)立分析問(wèn)題解決問(wèn)題的思維習(xí)慣。4. 高中物理學(xué)習(xí)的基本要求高中物理學(xué)習(xí)應(yīng)該“重視實(shí)驗(yàn),勤于思考”和“經(jīng)歷過(guò)程,體驗(yàn)方法”。高中物理學(xué)習(xí)與初中物理學(xué)習(xí)雖然有一定區(qū)別,但也不是孤立的,要繼續(xù)堅(jiān)持初中物理學(xué)習(xí)中積累的學(xué)習(xí)方法和體會(huì),重視從正反兩個(gè)方面加以總結(jié)和提煉,做到:(1) 認(rèn)真閱讀,學(xué)會(huì)自學(xué)要學(xué)好物理,就要認(rèn)真閱讀課本。閱讀課本是要抓住關(guān)鍵詞語(yǔ),弄清語(yǔ)句間的邏輯順序和因果關(guān)系,領(lǐng)會(huì)文章段落所表達(dá)的物理內(nèi)容,掌握課本敘述物理問(wèn)題的表達(dá)方法。
八、物理學(xué)的基礎(chǔ)地位及物理學(xué)對(duì)人類文明、社會(huì)進(jìn)步的影響。(1) 情景一:磁懸浮實(shí)驗(yàn):找兩個(gè)空心的圓柱片磁鐵,同名磁極相對(duì),穿在同一根竹筷上,用手壓下上面的磁鐵,松手觀察它的運(yùn)動(dòng)情況。問(wèn)題1:上面的磁鐵為什么會(huì)跳起來(lái),為什么會(huì)懸浮在下面的磁鐵上方?問(wèn)題2:根據(jù)這個(gè)實(shí)驗(yàn),你會(huì)想到那一種交通工具?總結(jié):人們就是從磁懸浮現(xiàn)象中得到啟發(fā),進(jìn)行磁懸浮列車的研究和制造的,這說(shuō)明物理學(xué)在推動(dòng)社會(huì)進(jìn)步、人類文明方面起到推動(dòng)作用。(2) 情景二:感應(yīng)起電和火花放電實(shí)驗(yàn):用感應(yīng)起電機(jī)或感應(yīng)圈產(chǎn)生火花放電,讓學(xué)生觀察現(xiàn)象,聞氣味,然后聯(lián)想生活實(shí)例。還可以用一張紙?jiān)囍鴵踝》烹姷幕」?,最好能引燃紙張,說(shuō)明雷擊引起火災(zāi)的現(xiàn)象。問(wèn)題1:你看、聽(tīng)到了什么現(xiàn)象?問(wèn)題2:根據(jù)這個(gè)實(shí)驗(yàn),你會(huì)想到那一種自然現(xiàn)象?問(wèn)題3:放電發(fā)生在什么地方?為什么建筑物上方都有尖尖的設(shè)置,是干什么用的?問(wèn)題4:你聞到什么氣味了嗎?
氣候變化對(duì)健康的影響 氣候變化對(duì)人體健康的不良影響是不難發(fā)現(xiàn)的:熱浪沖擊頻繁加重可致死亡率及某些疾病、特別是心臟呼吸系統(tǒng)疾病發(fā)病率增加;對(duì)氣候變化敏感的傳染性疾病如瘧疾和登革熱的傳播范圍可能增加。極端氣候事件, 如干旱、水災(zāi)、暴風(fēng)雨等, 使死亡率、傷殘率及傳染病疾病率上升, 并增加社會(huì)心理壓力。某些媒介疾病的加重也可能與氣候變化有間接的關(guān)系, 如瘧疾是通過(guò)蚊子傳播的疾病,氣候變化可能使某些變暖地區(qū)的蚊子數(shù)目增加, 從而加重了瘧疾的發(fā)生。我國(guó)1994年瘧疾的發(fā)病率為5.3408/10萬(wàn), 居全國(guó)法定傳染病的第六位。血吸蟲(chóng)病的發(fā)展與高溫及灌溉系統(tǒng)的擴(kuò)增有關(guān)。我國(guó)1994年南方12省市血吸蟲(chóng)病患者的檢出率高達(dá)3.67%,不能忽視氣候變化對(duì)此的可能影響。還有一些疾病,如睡眠病、登革熱、黑熱病等也有與氣候關(guān)系的報(bào)道。另外, CO2、一些空氣污染物如氮氧化物、臭氧等可增加過(guò)敏疾患及心臟呼吸系統(tǒng)疾病和死亡。