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1、Passage AIt is hard to think of a world without metals.Different metals have different uses,for example,steel is used in cars,and iron is used in electrical equipment.When we use metals,it is important to know how they react with different substances,for example,water and oxygen.The reaction of meta
2、ls with these substances can be put in order.Here is a table with the metals that react most at the top,and the metals that react least at the bottom.MetalHeated in oxygenReaction withwater or steamPotassiumBurns to form an oxide*Reacting withcold waterSodiumCalciumMagnesiumReacting withsteamAlumini
3、umZincIronReacts slowlyPartial reactionCopperPartial reactionNo reaction* an oxideanother substanceoxygenPassage BA Simple Scientific ExperimentBelow is a description of a simple scientific experiment.It shows us how iron reacts with air and with water.Aim: To find out if iron rusts (a) in dry air;(
4、b) in water that has no air in it (airfree water);(c) in ordinary water.Apparatus: 3 clean iron nails;test tubes;test tube holder;cotton wool;oil;Bunsen burner.Iron in dry airMethod(1) Put some iron nails at the bottom of a test tube.(2) Push some cotton wool down the tube.(3) Leave the tube for one
5、 week.ResultAfter one week,the nails have not rusted.ConclusionIron does not rust in dry air.Iron in airfree waterMethod(1) Halffill a test tube with water.(2) Boil the water for three minutes.(This makes sure there is no air in the water.)(3) Put two or three clean nails in the water.(4) Add some o
6、il to the water.This will keep air out of the water.(5) Leave the tube for one week.ResultThe nails do not rust in the tube with airfree water.ConclusionIron does not rust in airfree water.Iron in ordinary waterMethod(1) Halffill a test tube with water and add two or three clean nails.(2) Leave the
7、tube for one week.ResultThe nails rust in the tube with ordinary water.ConclusionIron rusts in ordinary water.文章文章A很難想象一個(gè)沒有金屬的世界。不同的金屬有不同的用途,比如,很難想象一個(gè)沒有金屬的世界。不同的金屬有不同的用途,比如,鋼材用于汽車中,鐵用于電氣設(shè)備鋼材用于汽車中,鐵用于電氣設(shè)備(electrical equipment)中。當(dāng)我們中。當(dāng)我們使用金屬時(shí),了解它們與不同的物質(zhì)如何反應(yīng)使用金屬時(shí),了解它們與不同的物質(zhì)如何反應(yīng)(react)很重要,比如,很重要,比如,水和氧氣
8、。水和氧氣。(不同的不同的)金屬與這些物質(zhì)的反應(yīng)金屬與這些物質(zhì)的反應(yīng)(reaction)程度可以按順程度可以按順序排列。表中金屬反應(yīng)最強(qiáng)的排在上面,反應(yīng)最弱的排在下面。序排列。表中金屬反應(yīng)最強(qiáng)的排在上面,反應(yīng)最弱的排在下面。 金屬金屬在氧氣在氧氣中加熱中加熱跟水或蒸汽反跟水或蒸汽反應(yīng)應(yīng)鉀鉀(potassium)燃燒生成燃燒生成(form) 氧化物氧化物(oxide)跟冷水反應(yīng)跟冷水反應(yīng)鈉鈉 (sodium)鈣鈣 (calcium)鎂鎂 (magnesium)跟蒸汽反應(yīng)跟蒸汽反應(yīng)鋁鋁 (aluminium)鋅鋅 (zinc)鐵鐵反應(yīng)緩慢反應(yīng)緩慢局部反應(yīng)局部反應(yīng)銅銅 (copper)局部局部 (p
9、artical)反應(yīng)反應(yīng)無反應(yīng)無反應(yīng)*一種氧化物另一種物質(zhì)氧一種氧化物另一種物質(zhì)氧 文章文章B一個(gè)簡(jiǎn)單的科學(xué)實(shí)驗(yàn)一個(gè)簡(jiǎn)單的科學(xué)實(shí)驗(yàn)下面是對(duì)一個(gè)簡(jiǎn)單的科學(xué)實(shí)驗(yàn)的描述。它向我們展示鐵如何與下面是對(duì)一個(gè)簡(jiǎn)單的科學(xué)實(shí)驗(yàn)的描述。它向我們展示鐵如何與空氣和水反應(yīng)??諝夂退磻?yīng)。目的:為了弄清鐵在下列情況下是否生銹目的:為了弄清鐵在下列情況下是否生銹(rust)(a)在干燥的空在干燥的空氣中;氣中;(b)在沒有空氣的水中;在沒有空氣的水中;(c)在普通的在普通的(ordinary)水中。水中。儀器:儀器:3枚干凈的鐵釘;試管;試管架;棉球;油;本生酒精枚干凈的鐵釘;試管;試管架;棉球;油;本生酒精燈。燈。鐵
10、在干燥的空氣中鐵在干燥的空氣中方法方法(1)把幾枚鐵釘放入試管底部。把幾枚鐵釘放入試管底部。(2)把一些棉球放入試管。把一些棉球放入試管。(3)將試管放置一周。將試管放置一周。結(jié)果結(jié)果一周后,鐵釘沒有生銹。一周后,鐵釘沒有生銹。結(jié)論結(jié)論 (conclusion)鐵在干燥的空氣中不生銹。鐵在干燥的空氣中不生銹。鐵在沒有空氣的水中鐵在沒有空氣的水中方法方法(1)在試管中注入一半水。在試管中注入一半水。(2)把水煮把水煮 (boil) 3分鐘。分鐘。(這樣可以確保水中沒有空氣。這樣可以確保水中沒有空氣。)(3)把把2到到3枚干凈的鐵釘放入水中。枚干凈的鐵釘放入水中。(4)在水中加入在水中加入(add
11、.to.) 一些油。這將防止空氣進(jìn)入水中。一些油。這將防止空氣進(jìn)入水中。(5)將試管放置一周。將試管放置一周。結(jié)果結(jié)果鐵釘在沒有空氣的水中沒有生銹。鐵釘在沒有空氣的水中沒有生銹。結(jié)論結(jié)論鐵在沒有空氣的水中不生銹。鐵在沒有空氣的水中不生銹。鐵在普通的水中鐵在普通的水中方法方法(1)在試管中注入一半水,加入在試管中注入一半水,加入2到到3枚干凈的鐵釘。枚干凈的鐵釘。(2)將試管放置一周。將試管放置一周。結(jié)果結(jié)果鐵釘在盛有普通的水的試管中生銹了。鐵釘在盛有普通的水的試管中生銹了。結(jié)論結(jié)論鐵在普通的水中生銹。鐵在普通的水中生銹。My feelings about science have really
12、 changed.I never used to enjoy science,but last year I changed schools,and the science teachers at my new school are excellent.The science facilities are very good,with laboratories that have all the latest equipment.Our chemistry teacher,Mr Longford,takes us to public science lectures about four ti
13、mes a term,and these are always very interesting,as the lecturers are people who have made real discoveries in their area of science.The fact is,Canada has many firstclass scientists.In the last twenty years,seven Canadian scientists have won the Nobel Prize!The Nobel Prize is the highest scientific
14、 prize there is,so we should be very proud of that.Im becoming more and more interested in physics,and have decided that I want to study it at university.Im going to try to go to either Montreal or Ottawa University,as both are supposed to have good Physics Departments.My parents are astonished.They
15、 always thought I would become an English teacher!我對(duì)理科的感受真的改變了。過去我對(duì)理科的感受真的改變了。過去(used to)我從不喜歡理科,但是去年我轉(zhuǎn)我從不喜歡理科,但是去年我轉(zhuǎn)學(xué)了,我的新學(xué)校的理科老師很棒??蒲性O(shè)備學(xué)了,我的新學(xué)校的理科老師很棒??蒲性O(shè)備(facility)很好,有配備了最新很好,有配備了最新設(shè)備的實(shí)驗(yàn)室。我們的化學(xué)老師朗福德先生大約每學(xué)期帶我們?nèi)ヂ犓拇喂O(shè)備的實(shí)驗(yàn)室。我們的化學(xué)老師朗福德先生大約每學(xué)期帶我們?nèi)ヂ犓拇喂部茖W(xué)講座共科學(xué)講座(lecture),這些講座總是非常有趣,因?yàn)檠葜v者都是一些在各自,這些講座總是非
16、常有趣,因?yàn)檠葜v者都是一些在各自的科學(xué)領(lǐng)域的科學(xué)領(lǐng)域(in the area of)真正有所發(fā)現(xiàn)的人。事實(shí)是,加拿大有很多一流真正有所發(fā)現(xiàn)的人。事實(shí)是,加拿大有很多一流的科學(xué)家。在過去的的科學(xué)家。在過去的20年里,年里,7名加拿大科學(xué)家獲諾貝爾獎(jiǎng)!諾貝爾獎(jiǎng)是現(xiàn)名加拿大科學(xué)家獲諾貝爾獎(jiǎng)!諾貝爾獎(jiǎng)是現(xiàn)有的最高科學(xué)獎(jiǎng)項(xiàng),因此我們應(yīng)該為此感到驕傲有的最高科學(xué)獎(jiǎng)項(xiàng),因此我們應(yīng)該為此感到驕傲(be proud of)。我對(duì)物理越來越感興趣,并且已決定到大學(xué)去學(xué)習(xí)物理。我打我對(duì)物理越來越感興趣,并且已決定到大學(xué)去學(xué)習(xí)物理。我打算上蒙特利爾大學(xué)或渥太華大學(xué),因?yàn)閮烧叨紤?yīng)該算上蒙特利爾大學(xué)或渥太華大學(xué),因?yàn)閮烧叨紤?yīng)該(be supposed to)擁有出色的物理系擁有出色的物理系(department)。我的父母感到很。我的父母感到很驚訝驚訝(astonished)。他們一直認(rèn)為我會(huì)成為一名英語教師!。他們一直認(rèn)為我會(huì)成為一名英語教師!