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托??荚噧?nèi)容是什么。

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留學(xué)院校申請條件是什么?留學(xué)費(fèi)用是多少?學(xué)校留學(xué)專業(yè)都有哪些?

點(diǎn)擊咨詢

托??荚噧?nèi)容是什么。

托?!綯OEFL】是由美國教育測驗(yàn)服務(wù)社(ETS)舉辦的英語能力考試,全名為“檢定非英語為母語者的英語能力考試”,中文音譯為“托?!?。TOEFL有三種,分別是:
pbt—paper based test 紙考 677, cbt—computer based test 機(jī)考 300,
ibt—internet based test 網(wǎng)考 120, 新托福滿分是120分。TOEFL考試的有效期為兩年,是從考試日期開始計算的。
新托福聽、說、讀、寫各部分滿分30分,共計120分。新托福80相當(dāng)于老托福550分,新托福100相當(dāng)于老托福600分。新托??荚嚕ňW(wǎng)考)滿分為120分,4部分各占30分。
TOEFL考試的試題分為四部分,前三部分全部采用多項(xiàng)選擇題。每道題一般有4個供選擇的答案,統(tǒng)一在規(guī)定的答題紙上答題。所有答案都使用計算機(jī)判分。第四部分是作文TWE??荚嚂r,先進(jìn)行作文考試,然后是其它三部分的考試,作文考試時間為30分鐘,其它三部分考試時間為110分鐘。從考生進(jìn)人考場到考試結(jié)束全過程需三個半小時。
第一部分是聽力理解(Listening
Comprehension),約50道題,30分鐘左右。主要是測試應(yīng)試者聽、說和理解美國英語的能力。該部分分為A,B,C三組,每組題前有詳細(xì)的說明。A組是句子,聽了一遍錄音后就作答;B組是簡單會話,聽了一遍錄音后就作答;C組是較長的會話或短文,聽了一遍錄音后考生應(yīng)就所需回答的問題立即作答。
第二部分是語法結(jié)構(gòu)和書面表達(dá)(Structure &
Written
Expressive),約40道題,考試時間為25分鐘。主要測試考生在標(biāo)準(zhǔn)英語書面寫作中掌握基本語法的能力。第二部分由A,B兩組題目組成。A組題目側(cè)重于語法結(jié)構(gòu),要求應(yīng)試者選擇正題答案完成不完整的句子;B組主要是從劃線的詞或短語中選出非正確答案來,以此來考查考生的書面表達(dá)能力。
第三部分是詞匯與閱讀理解(Vocabulary &
Reading
Comprehension)約60道題,45分鐘。主要是測試考生運(yùn)用英語詞匯的能力以及理解各類英語閱讀材料的能力。本部分也分為A,B兩組,A組是就劃線部分選出最佳答案;B組是根據(jù)閱讀材料選出含義正確的答案。
TOEFL考試成績包括三個項(xiàng)目成績和一個總成績。三個部分成績是考生答對題數(shù)所得“原始分”,經(jīng)過統(tǒng)計手段而得到的“比例分”,而總成績則是三部分比例分之和乘10除以3得到的??忌疱e不倒扣分,因此T0EFL考試在世界上最好成績?yōu)?80分。美國或加拿大的院校對新生入學(xué)的錄取分?jǐn)?shù)線沒有統(tǒng)一規(guī)定,但一般約四分之三的院校要求新生的T0EFL成績達(dá)到550分以上。美國文學(xué)、人文科學(xué)、新聞學(xué)和商業(yè)管理學(xué)等專業(yè)對TOEFL成績要求更高一些,計算機(jī)、數(shù)學(xué)和自然科學(xué)專業(yè)要求則略低一些。T0EFL考試成績兩年內(nèi)有效,兩年以后需要T0EFL成績者,必須重新參加考試。

一道托福試題

首先可以確定這是個并列句。

第一分句:Inequalities of wealth and rank certainly exist, and have probably existed in most pastoralist societies,

該分句的主語是復(fù)數(shù)名詞Inequalities of wealth and rank(財富和等級的不平等),其中有兩個并列謂語:

1、certainly exist

2、haveprobably existed in most pastoralist societies

第二分句:but except in periods of military conquest, they are normally too slight to generate the stable.

該分句是帶有介詞短語的簡單句,they 指代上文的復(fù)數(shù)名詞 Inequalities of wealth and rank

那么,整個句子改寫為三個簡單句:

Inequalities of wealth and rank certainly exist. 財富和等級的不平等確實(shí)存在。

Inequalities of wealth and rank have probably existed in most pastoralist societies. 財富和等級的不平等或許已經(jīng)在多數(shù)理想社會中存在。

Inequalities of wealth and rank are normally too slight to generate the stable except in periods of military conquest. 除了在軍事戰(zhàn)領(lǐng)期間,財富和等級的不平等一般說來過于微不足道而不足以形成這類穩(wěn)定的局面。

The inequalities is most marked during periods of military conquest(這些不平等在軍事戰(zhàn)領(lǐng)期間極為顯著)與 they are normally too slight to generate… 以及前面的一句在意思上大相徑庭。

究竟正與否,需要看題目的要求。如選擇不能表述上文意思的一項(xiàng),它應(yīng)該是正確的;反之,則是錯誤的。

托福閱讀TPO16(試題+答案+譯文)第2篇

TPO是我們常用的托福??脊ぞ?,對我們的備考很有價值,下面我給大家?guī)硗懈i喿xTPO16(試題+答案+譯文)第2篇:Development of the Periodic Table。

托福閱讀原文

The periodic table is a chart that reflects the periodic recurrence of chemical and physical properties of the elements when the elements are arranged in order of increasing atomic number (the number of protons in the nucleus). It is a monumental scientific achievement, and its development illustrates the essential interplay between observation, prediction, and testing required for scientific progress. In the 1800's scientists were searching for new elements. By the late 1860's more than 60 chemical elements had been identified, and much was known about their descriptive chemistry. Various proposals were put forth to arrange the elements into groups based on similarities in chemical and physical properties. The next step was to recognize a connection between group properties (physical or chemical similarities) and atomic mass (the measured mass of an individual atom of an element). When the elements known at the time were ordered by increasing atomic mass, it was found that successive elements belonged to different chemical groups and that the order of the groups in this sequence was fixed and repeated itself at regular intervals. Thus when the series of elements was written so as to begin a new horizontal row with each alkali metal, elements of the same groups were automatically assembled in vertical columns in a periodic table of the elements. This table was the forerunner of the modern table.

When the German chemist Lothar Meyer and (independently) the Russian Dmitry Mendeleyev first introduced the periodic table in 1869-70, one-third of the naturally occurring chemical elements had not yet been discovered. Yet both chemists were sufficiently farsighted to leave gaps where their analyses of periodic physical and chemical properties indicated that new elements should be located. Mendeleyev was bolder than Meyer and even assumed that if a measured atomic mass put an element in the wrong place in the table, the atomic mass was wrong. In some cases this was true. Indium, for example, had previously been assigned an atomic mass between those of arsenic and selenium. Because there is no space in the periodic table between these two elements, Mendeleyev suggested that the atomic mass of indium be changed to a completely different value, where it would fill an empty space between cadmium and tin. In fact, subsequent work has shown that in a periodic table, elements should not be ordered strictly by atomic mass. For example, tellurium comes before iodine in the periodic table, even though its atomic mass is slightly greater. Such anomalies are due to the relative abundance of the "isotopes" or varieties of each element. All the isotopes of a given element have the same number of protons, but differ in their number of neutrons, and hence in their atomic mass. The isotopes of a given element have the same chemical properties but slightly different physical properties. We now know that atomic number (the number of protons in the nucleus), not atomic mass number (the number of protons and neutrons), determines chemical behavior.

Mendeleyev went further than Meyer in another respect: he predicted the properties of six elements yet to be discovered. For example, a gap just below aluminum suggested a new element would be found with properties analogous to those of aluminum. Mendeleyev designated this element "eka-aluminum" (eka is the Sanskrit word for "next") and predicted its properties. Just five years later an element with the proper atomic mass was isolated and named gallium by its discoverer. The close correspondence between the observed properties of gallium and Mendeleyev’s predictions for eka-aluminum lent strong support to the periodic law. Additional support came in 1885 when eka-silicon, which had also been described in advance by Mendeleyev, was discovered and named germanium.

The structure of the periodic table appeared to limit the number of possible elements. It was therefore quite surprising when John William Strut (Lord Rayleigh, discovered a gaseous element in 1894 that did not fit into the previous classification scheme. A century earlier, Henry Cavendish had noted the existence of a residual gas when oxygen and nitrogen are removed from air, but its importance had not been realized. Together with William Ramsay, Rayleigh isolated the gas (separating it from other substances into its pure state) and named it argon. Ramsay then studied a gas that was present in natural gas deposits and discovered that it was helium, an element whose presence in the Sun had been noted earlier in the spectrum of sunlight but that had not previously been known on Earth. Rayleigh and Ramsay postulated the existence of a new group of elements, and in 1898 other members of the series (neon, krypton, and xenon) were isolated.

托福閱讀試題

1.The phrase interplay in the passage (paragraph 1) is closest in meaning to

A.sequence

B.interpretation

C.requirement

D.interaction

2.According to paragraph 1, what pattern did scientists notice when the known elements were written in order of increasing atomic mass?

A.The elements of the group of alkali metals were the first elements in the order of increasing atomic mass.

B.Repetition of the same atomic masses for elements in different groups appeared.

C.Elements with similar chemical properties appeared in the listing at regular intervals.

D.Elements were chemically most similar to those just before and after them in the order.

3.In paragraph 2, what is the author's purpose in presenting the information about the decision by Meyer and Mendeleyev to leave gaps in the periodic table?

A.To illustrate their confidence that the organizing principles of the periodic table would govern the occurrence of all chemical elements

B.To indicate that some of their analyses of periodic physical and chemical properties were later found to be wrong

C.To support the idea that they were unwilling to place new elements in the periodic table

D.To indicate how they handled their disagreement about where to place new elements

4.What reason does the author provide for the claim that Mendeleyev was bolder than Meyer?(in paragraph 2)

A.Mendeleyev corrected incorrect information Meyer had proposed.

B.Mendeleyev assumed that some information believed to be true about the elements was incorrect.

C.Mendeleyev argued that Meyer had not left enough gaps in the periodic table.

D.Mendeleyev realized that elements were not ordered by atomic mass in the periodic table.

5.According to paragraph 2, why did Mendeleyev suggest changing the atomic mass of indium?

A.Because indium did not fit into the periodic table in the place predicted by its atomic mass.

B.Because there was experimental evidence that the atomic mass that had been assigned to indium was incorrect.

C.Because there was an empty space between cadmium and tin in the periodic table.

D.Because the chemical properties of indium were similar to those of arsenic and selenium.

6.It can be inferred from paragraph 2 that tellurium comes before iodine in the periodic table even though tellurium's atomic mass is slightly greater because

A.iodine is less common than tellurium

B.both iodine and tellurium have no isotopes

C.the chemical behavior of tellurium is highly variable

D.the atomic number of tellurium is smaller than that of iodine

7.The phrase “abundance” in the passage (paragraph 2) is closest in meaning to

A.weight

B.requirement

C.plenty

D.sequence

8.The phrase “analogous to” in the passage (paragraph 3) is closest in meaning to

A.predicted by

B.expected of

C.similar to

D.superior to

9.Paragraph 3 suggests that Mendeleyev predicted the properties of eka-aluminum on the basis of

A.the atomic mass of aluminum

B.the position of the gap in the periodic table that eka-aluminum was predicted to fill

C.the similarity of eka-aluminum to the other five missing elements

D.observation of the properties of gallium

10.It can be inferred from paragraph 3 that the significance of the discovery of gallium was that it supported which of the following?

A.The idea that aluminum was correctly placed in the periodic table.

B.Mendeleyev's prediction that eka-silicon would be discovered next.

C.The organizing principle of the periodic table.

D.The idea that unknown elements existed.

11.Which of the sentences below best expresses the essential information in the highlighted sentence in the passage (paragraph 4)? Incorrect choices change the meaning in important ways or leave out essential information.

A.Ramsay found evidence of helium in the spectrum of sunlight before he discovered that the element was also contained in natural gas deposits on Earth.

B.Ramsay thought he had discovered a new element present in natural gas deposits, but he was wrong since that element had been previously observed elsewhere on Earth.

C.After Ramsay had discovered a new element, called helium, in natural gas deposits on Earth, he also found evidence of its presence in the Sun.

D.Ramsay later discovered that helium, an element that was already known to be present in the Sun, was also present in natural gas deposits on Earth.

12.The word “postulated” in the passage (paragraph 4) is closest in meaning to

A.hypothesized

B.discovered

C.reported

D.generated

13. Look at the four squares [■] that indicate where the following sentence could be added to the passage. Where would the sentence best fit? It was a natural Idea to break up the series of elements at the points where the sequence of chemical groups to which the elements belonged began to repeat itself.

Paragraph1: The periodic table is a chart that reflects the periodic recurrence of chemical and physical properties of the elements when the elements are arranged in order of increasing atomic number (the number of protons in the nucleus). It is a monumental scientific achievement, and its development illustrates the essential interplay between observation, prediction, and testing required for scientific progress. In the 1800's scientists were searching for new elements. By the late 1860's more than 60 chemical elements had been identified, and much was known about their descriptive chemistry. Various proposals were put forth to arrange the elements into groups based on similarities in chemical and physical properties. ■【A】The next step was to recognize a connection between group properties (physical or chemical similarities) and atomic mass (the measured mass of an individual atom of an element). ■【B】When the elements known at the time were ordered by increasing atomic mass, it was found that successive elements belonged to different chemical groups and that the order of the groups in this sequence was fixed and repeated itself at regular intervals. ■【C】Thus when the series of elements was written so as to begin a new horizontal row with each alkali metal, elements of the same groups were automatically assembled in vertical columns in a periodic table of the elements. ■【D】This table was the forerunner of the modern table.

14. Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points.

The periodic table introduced by Meyer and Mendeleyev was the forerunner of the modern table of elements.

A.Lord Rayleigh provided evidence that the structure of the I—Ramsay and Lord Rayleigh challenged the importance of the periodic table limited the potential number of elements.

B.Chemical research that Henry Cavendish had done a century earlier.

C.Isotopes of a given element have exactly the same physical properties, but their chemical properties are slightly different.

D. Mendeleyev and Meyer organized the known elements into a F chart that revealed periodic recurrences of chemical and physical properties.

E.Mendeleyev's successful prediction of the properties of then- r unknown elements lent support to the acceptance of the periodic law.

F.In the 1890's, Ramsay and Lord Rayleigh isolated argon and proposed the existence of a new series of elements.

托福 閱讀答案

1.interplay相互作用,所以D的interaction正確。從單詞本身看,inter表示在……之間,play是起到什么什么作用,所以interplay是相互作用。原句說觀察、預(yù)測與實(shí)驗(yàn)相互作用,所以答案是interaction,A順序B解釋C要求都錯。

2.以increasing atomic mass做關(guān)鍵詞定位至倒數(shù)第三句,說把元素按照原子量增加的順序排布,發(fā)現(xiàn)相鄰元素屬于不同的族,族的順序是固定的,每隔固定數(shù)量的元素會重現(xiàn)。所以正確答案是C。A的alkali metals,B的same atomic mass原文都沒說;D說相鄰元素性質(zhì)相近與原文相反。

3.修辭目的題,先找到兩個人名,說兩個人都非常有遠(yuǎn)見,在周期表中給沒發(fā)現(xiàn)的元素留了空隙,也就是A說的他們足夠自信認(rèn)為元素周期律適用于所有元素;B的wrong和C的unwilling都跟原文說反;D的disagreement原文沒說。

4.修辭目的題,先找到兩個人名,說門捷列夫比梅伊爾更膽兒大,他推測如果用來在周期表中排序的原子量與元素周期律互相沖突的時候,就說明原子量錯了,也就是選項(xiàng)B說的門捷列夫認(rèn)為以前被大家所認(rèn)識到的一些東西是錯的。兩個人的意見是一樣的,只是門捷列夫更進(jìn)一步,所以A和C說兩者的意見有差異不對;D說不是按原子量排序的錯。

5.以changing the atomic mass of indium做關(guān)鍵詞定位至第六句,說由于元素周期表中砷和硒之間沒有空位,所以銦的原子量是錯的。因?yàn)榍懊嬲f如果原子量把元素放錯了位置,就說明原子量是錯的,后一句是為了證明這個觀點(diǎn)的,所以答案是A。B的experimental evidence和D的化學(xué)性質(zhì)相似原文都沒說;C有space與原文相反。

6.以tellerium coms before iodine做關(guān)鍵詞定位至倒數(shù)第五句for example處,但這句話只是一個例子,所以往前看,說元素不應(yīng)該嚴(yán)格按照原子量排列,而且最后一句又說決定元素化學(xué)性質(zhì)的是原子序數(shù),不是原子量,也就是應(yīng)該按照原序數(shù)量排列,所以答案D正確。A誰common誰不common,B有沒有同位素還有C的化學(xué)性質(zhì)多變沒有信息能推出。

7.abundance豐度,答案是plenty。原句說這種異常,也就是盡管原子量大卻排在前面這種異常是由于同位素的什么,然后后面就解釋每種同位素的原子序數(shù)相同,但中子數(shù)不同,導(dǎo)致原子量不同,猜到每種同位素的多少不同,所以答案plenty,B要求D順序明顯不對;A重量不同原文已經(jīng)直接說了不用再說一遍。

8.analogous to可類比的,相似的,所以答案similar to正確。原句說鋁元素之下的空格表明一個性質(zhì)與鋁怎么樣的元素的存在,前文都說了相鄰的元素屬于不同的族,而且族會相隔固定數(shù)目的元素出現(xiàn),而且根據(jù)常識也知道元素周期表中上下兩元素性質(zhì)相似,所以答案是similar。A實(shí)現(xiàn)預(yù)測的是人,不是鋁元素的性質(zhì);B期待不靠譜;D誰比誰好原文沒說。

9.以eka-aluminum做關(guān)鍵詞定位至第三句,但這句話只說了預(yù)測了eka的性質(zhì),沒說根據(jù)什么預(yù)測的,看上一句,說eka是鋁之下的那個空格里的元素,而且跟鋁性質(zhì)相似,所以答案是B,eka要填的那個空格。A鋁的原子量C另外五個沒發(fā)現(xiàn)的元素D的gallium原文都沒說。

10.gallium做關(guān)鍵詞定位至倒數(shù)第三句,但這句話只是說命名為GA,沒說支持什么,往下看說GA的發(fā)現(xiàn)支持了元素周期律,而問題剛好是問GA的發(fā)現(xiàn)支持了什么,所以答案是C,元素周期表的組成規(guī)律,也就是元素周期律。

11.原文的結(jié)構(gòu)是R研究了一種氣體,并且發(fā)現(xiàn)這種氣體是氦,所以答案是D。A完全搞亂了原文的結(jié)構(gòu),氦在太陽光譜中不是R發(fā)現(xiàn)的;B的轉(zhuǎn)折關(guān)系錯;C和A的錯誤相似,氦在太陽光譜中不是R發(fā)現(xiàn)的。

12.postulate推斷,推測,所以hypothesize正確。原句說這兩個人怎么樣一個新的元素族的存在,接著后面的人分離出了這些元素,既然是后面的人分離的,discover和report就不對,因?yàn)檫@兩個詞有他們兩個發(fā)現(xiàn)的意思;generate完全不對,這兩個人不能產(chǎn)生元素。

13.三個過渡點(diǎn),分別是名詞chemical groups,名詞sequence和動詞詞組repeat itself,這幾個點(diǎn)都可以確定B或者C是答案,但B前后的atomic mass說明兩句話的過渡是非常緊密的,所以B被排除,答案是C。

14.Lord選項(xiàng)錯,原文沒說他的研究提供了元素周期表限制元素數(shù)量的證據(jù),不選。Ramsay and Lord選項(xiàng)錯,原文沒說他們倆挑戰(zhàn)了卡文迪許,不選。Isotopes選項(xiàng)是原文第二段中的一個細(xì)節(jié),不選。Mendeleyev and Meyer選項(xiàng)對應(yīng)原文第一段后半部分,正確。Mendeleyev’s選項(xiàng)對應(yīng)原文第三段最后兩句,正確。In the 1890’s選項(xiàng)對應(yīng)全文最后一句話,正確。

托福閱讀譯文

元素周期表是按原子序數(shù)(元素原子核中質(zhì)子的數(shù)量)由小到大依次排列,反映化學(xué)周期性和元素的物理特征的圖表。這一科學(xué)發(fā)現(xiàn)具有里程碑的意義,它進(jìn)一步證明了科學(xué)探索過程中觀察、預(yù)測和實(shí)證之間的根本聯(lián)系。19世紀(jì)一開始,科學(xué)家們不斷探索新的元素。到19世紀(jì)60年代后期,已經(jīng)發(fā)現(xiàn)了60種以上的化學(xué)元素,而許多描述性化學(xué)被認(rèn)知。人們提出各種建議,認(rèn)為該基于化學(xué)和物理特征的相似性將化學(xué)元素排列成組。他們接下來又證實(shí)了元素的族群特性(物理或是化學(xué)相似性)和原子質(zhì)量(一種元素的單個原子的測量質(zhì)量)之間存在聯(lián)系。當(dāng)時元素還是按照原子質(zhì)量從小到大排列,人們發(fā)現(xiàn),一些具備連續(xù)性的元素卻分屬不同的化學(xué)組,并且發(fā)現(xiàn)在這種排列方式下,元素群組的順序是固定的且定期重復(fù)。因此,當(dāng)每一新行都以堿性金屬元素開始并逐步將這一系列的元素排列出來時,元素周期表中同一組中的元素就會自動歸入一個垂直縱列中。這個表格就是現(xiàn)代元素周期表的雛形。

當(dāng)?shù)聡瘜W(xué)家邁耶(Lother Meyer)和(彼此獨(dú)立的)俄國化學(xué)家門捷列夫在1869年到1870年間首次發(fā)布元素周期表時,有三分之一的天然化學(xué)元素還沒被發(fā)現(xiàn)。然而這兩位化學(xué)家都極富遠(yuǎn)見,他們在周期表上留白,對元素物理性和化學(xué)性的分析空白處還有新的元素有待發(fā)現(xiàn)。門捷列夫比邁耶更為大膽,他甚至做出假設(shè),如果周期表按原子質(zhì)量排列,但元素位置不對的話,那么原子質(zhì)量也是錯的。在某些情況下,這個設(shè)想是正確的。以銦為例,先前測量出銦的原子質(zhì)量在砷和硒之間。但是因?yàn)樵谥芷诒碇羞@兩個元素之間沒有縫隙,由此門捷列夫提出銦的原子質(zhì)量變?yōu)榻厝徊煌囊粋€值,這樣就可以將其置于鎘和錫之間的空位。事實(shí)上,接下來的研究表明,元素周期表中元素不能嚴(yán)格按照原子質(zhì)量排列。例如,盡管碲的原子質(zhì)量比碘略大,但在元素周期表中,它卻排在碘前面。出現(xiàn)這種反?,F(xiàn)象,主要是因?yàn)橄鄬ωS富的“同位素 ”或者各種元素的多樣性。同一元素的所有同位素具有相同的質(zhì)子數(shù),但中子數(shù)不同,因此它們的原子質(zhì)量也不一樣。一個特定元素的同位素具有相同的化學(xué)特征,但在物理性質(zhì)上有一些細(xì)微差異?,F(xiàn)在我們知道,是原子數(shù)目(原子核中質(zhì)子的數(shù)量)而非原子質(zhì)量(質(zhì)子和中子的數(shù)量)決定著元素的化學(xué)性質(zhì)。

門捷列夫在另一個研究上也比邁耶更為深入:他預(yù)測還有六種元素的性質(zhì)待被發(fā)現(xiàn)。例如,就在鋁下面有一個空位,這表明還有一個性質(zhì)和鋁類似的新元素存在。門捷列夫?qū)⒃撛囟x為“鋁下元素 ”(eka是梵語詞,意思是 “下一個”)并且還預(yù)測了其性質(zhì)。僅僅5年之后,原子質(zhì)量相吻合的元素就被分離出來,發(fā)現(xiàn)者將其命名為“鎵”。鎵所表現(xiàn)出的特性和門捷列夫?qū)Α颁X下元素”的預(yù)測一一對應(yīng),這為元素法則提供了一個強(qiáng)有力的依據(jù)。還有一個例證,1885年發(fā)現(xiàn)“硅下元素”,同樣為門捷列夫所預(yù)測,后來命名為鍺。

元素周期表的框架似乎限制了可能存在的元素數(shù)量。因此,當(dāng)約翰?威廉姆?斯特拉特(瑞利男爵),在1894年發(fā)現(xiàn)一種氣態(tài)元素不能適應(yīng)之前的元素表時會非常驚訝。一個世紀(jì)以前,亨利?卡文迪許就注意到,當(dāng)氧氣和氮?dú)鈴目諝庵斜灰瞥笕匀挥袣堄鄽怏w存在,但當(dāng)時沒人意識到其中的重要性。瑞利和威廉?拉姆齊一道,共同分離出一種氣體(將之與其他物質(zhì)隔離并存于一個真空環(huán)境)并將其命名為氬。拉姆齊經(jīng)過研究又發(fā)現(xiàn)了另一種存在于自然界中的氣體元素——氦,該元素在太陽中存在,并且很早就被發(fā)現(xiàn)存在于太陽光譜中,但是之前并沒有在地球上找到過。瑞利和拉姆齊做出假設(shè),認(rèn)為存在一組新元素,1898年,這一系列元素中的其他元素(氖,氪,氙)也被成功分離出來。

具有相同質(zhì)子數(shù),不同中子數(shù)(或不同質(zhì)量數(shù))同一元素的不同核素互為同位素(Isotopes)。

Eka是一個用來為在元素周期表中位于某個元素下面的位置的化學(xué)元素命名的前綴。前綴eka-尤其用于命名尚未發(fā)現(xiàn)的元素。例如,在發(fā)現(xiàn)鍺以前它被稱為硅下元素(eka-硅,ekasilicon)。

托福閱讀TPO16(試題+答案+譯文)第2篇相關(guān) 文章 :

托??荚囶}型介紹

新托福由四部分組成,分別是閱讀(Reading)、聽力(Listening)、口試(Speaking)、寫作(Writing)。每部分滿分30分,整個試題滿分120分。閱讀(Reading):
有三篇文章, 每篇文章對應(yīng)有12-14道試題,均為選擇題。除了最后一道試題之外,其他試題都是針對文章的某一部分提問,試題的出現(xiàn)順序與文章的段落順序一致。最后一題針對整篇文章提問,要求考生從多條選擇項(xiàng)中挑選若干項(xiàng)對全文進(jìn)行總結(jié)或歸納。新一代托福閱讀文章的篇幅比老托福閱讀文章的篇幅略長,難度也有所增加。這部分持續(xù)時間為1小時。聽力(Listening):
由兩篇較長的校園情景對話和四篇課堂演講組成,課堂演講每篇長約5分鐘。由于是機(jī)考,考生在聽錄音資料之前無法得知試題。在播放錄音資料時,電腦屏幕上會顯示相應(yīng)的背景圖片??忌梢栽诼犚暨^程中記筆記??忌荒軓?fù)查、修改已遞交的答案。這個部分持續(xù)大約50分鐘。聽力水平無疑是新托福成功與否的關(guān)鍵,除閱讀外,無論哪一部分都離不開“聽”。對于中國考生來說,聽力卻正是薄弱環(huán)節(jié)。目前中國考生提高聽力的其中一條有效途徑是“聽寫法”,即把相關(guān)聽力材料拿來精聽,并把聽到的內(nèi)容逐句寫下來。也有專門用來練習(xí)新托福聽寫的軟件,如新托福聽寫王軟件?!奥爩懛ā碧岣呗犃Φ囊粋€缺點(diǎn)是,剛開始練習(xí)時可能比較費(fèi)時。口試(Speaking):
把TSE(Test of Spoken English)融合在新托福中。然而與現(xiàn)行的TSE相比又有較大改動。這個部分共有6題,持續(xù)約20分鐘。第一、二題要求考生就某一話題闡述自己的觀點(diǎn)。第三、四題要求考生首先在45秒內(nèi)閱讀一段短文,隨后短文隱去,播放一段與短文有關(guān)的對話或課堂演講。最后,要求考生根據(jù)先前閱讀的短文和播放的對話或課堂演講回答相關(guān)問題,考生有30秒鐘的準(zhǔn)備時間,然后進(jìn)行60秒鐘的回答。例如,短文中描述了對學(xué)校體育館進(jìn)行擴(kuò)建的兩種方案,對話中一位同學(xué)闡述了自己的立場,即贊成哪種方案,反對哪種方案,并列舉了若干理由。要求考生敘述對話中同學(xué)的立場并解釋他/她列舉了哪些理由支持這一觀點(diǎn)。第五、六題要求考生聽一段校園情景對話或課堂演講,然后回答相關(guān)問題??忌?0秒鐘的準(zhǔn)備時間,之后進(jìn)行60秒鐘的回答。例如,先播放一段市場學(xué)課堂演講,演講中教授列舉了兩種市場調(diào)查的方法,然后要求考生使用課堂演講中的觀點(diǎn)和例子描述教授列舉出的兩種市場調(diào)查的方法??忌梢栽诼犚暨^程中記筆記以幫助答題。在準(zhǔn)備和答題時,屏幕上會顯示倒計時的時鐘。寫作(Writing):
要求考生在1小時內(nèi)完成兩篇作文。其中一篇類似于老托福的寫作,要求考生在30分鐘內(nèi)就某一話題闡述自己的觀點(diǎn),字?jǐn)?shù)要求為300字以上。另一篇則要求考生首先閱讀一篇文章,五分鐘以后,文章隱去,播放一段與文章有關(guān)的課堂演講。課堂演講列舉了一些論據(jù)反駁文章中的論點(diǎn)、論據(jù)。隨后要求考生在20分鐘內(nèi)寫一篇作文,總結(jié)課堂演講的論點(diǎn)、論據(jù),并陳述這些論點(diǎn)、論據(jù)是如何反駁文章的論點(diǎn)、論據(jù)的,字?jǐn)?shù)要求為150字到225字之間。在寫作時,文章會重新顯示在屏幕上。這篇作文不要求考生闡述自己的觀點(diǎn)。加試:
一般實(shí)際考試中,考生往往會在聽力或閱讀部分碰到加試試題,也有可能閱讀、聽力兩部分同時被加試。加試部分不算分(有人說會算分,說是抽幾題給分),但考生事先并不知道哪一部分是加試部分(有的時候經(jīng)典加試是能判斷出來的),所以應(yīng)該認(rèn)真對待。 題目可以去留學(xué)黨論壇找一下。

托福考試全真試題買哪本

《托??荚嚾嬖囶}集》。本書為ETS在中國獨(dú)家授權(quán)版本,也是ETS為托??荚嚲帉懙奈ㄒ灰槐竟俜秸骖}集。書中提供了5套以往考過的托??荚囋囶},幫助考生體驗(yàn)真實(shí)考場情境。本書最后附有托福考試備考計劃,旨在幫助考生更有效的備考并了解通過考試如何增強(qiáng)必需具備的英語技能。

托福IBT的考試題型及每個題型的分值是多少

新托福由四部分組成,分別是閱讀(Reading)、聽力(Listening)、口試(Speaking)、寫作(Writing)。每部分滿分30分,整個試題滿分120分。

閱讀

新托??荚囬喿x部分約為60分鐘,包括3篇文章,每篇650至750個單詞,每篇對應(yīng)11至13道試題。題目類型包括:圖表題,篇章總結(jié)題(從給出的選項(xiàng)中選擇能夠概括文章內(nèi)容的句子),變換措辭題,詞匯題(在一定的上下文中),指代關(guān)系題,簡化句子題,插入文本題,事實(shí)信息題,推斷題,修辭目的題以及否定排除題(例如,下列各項(xiàng)均正確除……之外)。在完成答題的過程中,考生可以使用“復(fù)查”功能瞬間找出沒有回答的題目,而不必每道題都過一遍。閱讀部分的總分是42至45分。

聽力

聽力部分包含兩個對話和四段演講(包括教室對話在內(nèi))。每個對話涉及2個或2個以上的說話者,每個對話對應(yīng)5道試題;每段演講對應(yīng)6道試題。聽力部分共包括34道試題。每道試題是1至2分,共34至36分。聽力部分的時間大約是20分鐘。每個對話是2至3分鐘,每個演講是4至6分鐘。考生可以在聽錄音的過程中做筆記幫助答題。

聽力水平無疑是新托福成功與否的關(guān)鍵,除閱讀外,無論哪一部分都離不開“聽”。對于中國考生來說,聽力卻正是薄弱環(huán)節(jié)。中國考生提高聽力的其中一條有效途徑是“聽寫法”,即把相關(guān)聽力材料拿來精聽,并把聽到的內(nèi)容逐句寫下來。也有專門用來練習(xí)新托福聽寫的軟件,如新托福聽寫王軟件?!奥爩懛ā碧岣呗犃Φ囊粋€缺點(diǎn)是,剛開始練習(xí)時可能比較費(fèi)時。

口語

新托??荚嚨目谡Z部分共有6題,總時間約為15分鐘。

第1題和第2題為獨(dú)立回答題,準(zhǔn)備時間為15秒,回答問題時間為45秒。問題會被朗讀出來,同時會出現(xiàn)在屏幕上。

第3題和第4題要求考生先閱讀一段文字,然后再聽一段與閱讀文字在內(nèi)容上相關(guān)的聽力材料,最后考生按照要求回答相關(guān)問題。通常一道題是情景題,另一道是學(xué)術(shù)題,閱讀材料只含一個自然段,共45秒鐘的閱讀時間。聽力材料可能是對話,也可能是演講,其長度大約為1分半鐘,考生可以在聽錄音的過程中做筆記來幫助答題??忌?0秒的準(zhǔn)備時間,60秒的回答問題時間。

第5題和第6題以考試中的聽力材料為基礎(chǔ),要求考生回答相關(guān)問題??忌?0秒的準(zhǔn)備時間,60秒的時間回答問題。每個回答的得分是0至4分。參加有針對性的考前模擬對真實(shí)環(huán)境和發(fā)揮都有一定的效果,像易格英語美國外教新托福一對一輔導(dǎo)。

寫作

新托福考試的寫作部分包括兩道試題,需在大約50分鐘的時間內(nèi)完成。獨(dú)立寫作試題部分需30分鐘的時間,需要考生根據(jù)自己的知識和經(jīng)驗(yàn)陳述、解釋并支持對待某一問題的某個看法。通常有效的回答應(yīng)是一篇300個單詞左右的作文。對于以閱讀和聽力材料為基礎(chǔ)的寫作試題,考生首先需要閱讀一篇學(xué)術(shù)演講,閱讀的時間是3分鐘。然后文章隱去,這時考生需要聽一段大約為1分半鐘的演講。但是考生在寫作文時可以看到在放聽力材料時隱去的閱讀材料??忌诼犱浺舻倪^程中可以做筆記來幫助答題。此外,考生有20分鐘的時間來總結(jié)聽力材料中的要點(diǎn),并解釋這些要點(diǎn)與閱讀材料中的要求有何不同。通常有效的回答應(yīng)是一篇150至225個單詞的作文。每個寫作任務(wù)的分?jǐn)?shù)是0至5分??疾榫C合語言技能的作文題目的評分以回答的質(zhì)量、完整性和準(zhǔn)確性為依據(jù)。

加試

一般實(shí)際考試中,考生往往會在聽力或閱讀部分碰到加試試題,加試部分不算分,但考生事先并不知道哪一部分是加試部分,所以應(yīng)該認(rèn)真對待。

TOEFL(R) iBT 樣題

考試環(huán)境:
我做過TOEFL的測試題,至于怎么打不開我不清楚,但我可以告訴你,TOEFL的模擬試與真正的TOEFL 考試環(huán)境差距 比較大,在模擬題中 沒有時間限制 題的答案也可以隨意更改,而且TOEFL白給的試題就“閱讀”和“聽力”2部分,答完就能知道答案,你要是沒考過,主要注意的是“答題時間”而這點(diǎn)模擬題恰恰做不到~ 一般閱讀估計自己在15-20分的學(xué)生 或者以下的 要不就是第一次考的 一定要注意考試時間,TOEFL無加試的閱讀時間安排是這樣的 第1個閱讀 是20分鐘個,第二個和第三個 一共是40分鐘,尤其注意后2的時間安排! 而且考TOEFL的時候你要注意“不要去的太晚” 有的人說“晚去點(diǎn),聽別人口語” 我本人覺得不可行,因?yàn)楫?dāng)你聽到別人答案的時候,一般不是“一個人說”而是“一堆人”說,不僅聽不到而且非常打擾自己答題,但要是 你有點(diǎn)子正好 趕上 你同桌說口語 你就合適了。
相關(guān)的測試題:
我知道 新東方 有賣網(wǎng)上模擬TOEFL考試的 一般是200RMB左右,有可能網(wǎng)絡(luò)掉線什么的~ 也就是 要是掉了 你就白買了~
關(guān)于你的樣題:
你的樣題 絕對不是因?yàn)?你沒有按那個 START 的原因,我的樣題做到一般直接關(guān)了 IE 再上 還能接著答,你可以重進(jìn)下 ETS TOEFL 那個樣題的網(wǎng)頁,或者 你可以注意下你注冊ETS TOEFL 的時候注冊的郵箱~ 要是你的樣題有毛病,或者被答了,或者是沒被啟用什么,能有提示在你的郵箱里,要是沒有提示 應(yīng)該 沒問題的~~
呵呵 最后 Good luck

雅思考試 托??荚?/a> 留學(xué)攻略 留學(xué)院校庫

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