- 相關(guān)推薦
2025年新托福閱讀理解考試練習(xí)及參考譯文
在現(xiàn)實(shí)的學(xué)習(xí)、工作中，我們最熟悉的就是考試題了，借助考試題可以更好地考核參考者的知識(shí)才能。什么樣的考試題才是好考試題呢？下面是小編收集整理的2025年新托福閱讀理解考試練習(xí)及參考譯文，歡迎大家分享。
新托福閱讀理解考試練習(xí)及參考譯文 1
The cinema did not emerge as a form of mass consumption until its technology evolved fromthe initial "peepshow" format to the point where images were projected on a screen in adarkened theater. In the peepshow format, a film was viewed through a small opening in amachine that was created for that purpose. Thomas Edisons peepshow device, theKinetoscope, was introduced to the public in 1894. It was designed for use in Kinetoscopeparlors, or arcades, which contained only a few individual machines and permitted only onecustomer to view a short, 50-foot film at any one time. The first Kinetoscope parlors containedfive machines. For the price of 25 cents (or 5 cents per machine), customers moved frommachine to machine to watch five different films (or, in the case of famous prizefights,successive rounds of a single fight).
These Kinetoscope arcades were modeled on phonograph parlors, which had proven successfulfor Edison several years earlier. In the phonograph parlors, customers listened to recordingsthrough individual ear tubes, moving from one machine to the next to hear different recordedspeeches or pieces of music. The Kinetoscope parlors functioned in a similar way. Edison wasmore interested in the sale of Kinetoscopes (for roughly $1,000 apiece) to these parlors than inthe films that would be run in them (which cost approximately $10 to $15 each). He refusedto develop projection technology, reasoning that if he made and sold projectors, thenexhibitors would purchase only one machine-a projector-from him instead of several.
Exhibitors, however, wanted to maximize their profits, which they could do more readily byprojecting a handful of films to hundreds of customers at a time (rather than one at a time) andby charging 25 to 50 cents admission. About a year after the opening of the first Kinetoscopeparlor in 1894, showmen such as Louis and Auguste Lumiere, Thomas Armat and CharlesFrancis Jenkins, and Orville and Woodville Latham (with the assistance of Edisons formerassistant, William Dickson) perfected projection devices. These early projection devices wereused in vaudeville theaters, legitimate theaters, local town halls, makeshift storefront theaters,fairgrounds, and amusement parks to show films to a mass audience.
With the advent of projection in 1895-1896, motion pictures became the ultimate form ofmass consumption. Previously, large audiences had viewed spectacles at the theater, wherevaudeville, popular dramas, musical and minstrel shows, classical plays, lectures, and slide-and-lantern shows had been presented to several hundred spectators at a time. But themovies differed significantly from these other forms of entertainment, which depended oneither live performance or (in the case of the slide-and-lantern shows) the activeinvolvement of a master of ceremonies who assembled the final program.
Although early exhibitors regularly accompanied movies with live acts, the substance of themovies themselves is mass-produced, prerecorded material that can easily be reproduced bytheaters with little or no active participation by the exhibitor. Even though early exhibitorsshaped their film programs by mixing films and other entertainments together in whichever waythey thought would be most attractive to audiences or by accompanying them with lectures,their creative control remained limited. What audiences came to see was the technologicalmarvel of the movies; the lifelike reproduction of the commonplace motion of trains, ofwaves striking the shore, and of people walking in the street; and the magic made possible bytrick photography and the manipulation of the camera.
With the advent of projection, the viewers relationship with the image was no longer private, asit had been with earlier peepshow devices such as the Kinetoscope and the Mutoscope, whichwas a similar machine that reproduced motion by means of successive images on individualphotographic cards instead of on strips of celluloid. It suddenly became public-an experiencethat the viewer shared with dozens, scores, and even hundreds of others. At the same time,the image that the spectator looked at expanded from the minuscule peepshow dimensions of1 or 2 inches (in height) to the life-size proportions of 6 or 9 feet.
Paragraph 1: The cinema did not emerge as a form of mass consumption until its technologyevolved from the initial "peepshow" format to the point where images were projected on ascreen in a darkened theater. In the peepshow format, a film was viewed through a smallopening in a machine that was created for that purpose. Thomas Edisons peepshow device,the Kinetoscope, was introduced to the public in 1894. It was designed for use in Kinetoscopeparlors, or arcades, which contained only a few individual machines and permitted only onecustomer to view a short, 50-foot film at any one time. The first Kinetoscope parlors containedfive machines. For the price of 25 cents (or 5 cents per machine), customers moved frommachine to machine to watch five different films (or, in the case of famous prizefights,successive rounds of a single fight).
1. According to paragraph 1, all of the following were true of viewing films in Kinetoscopeparlors EXCEPT:
○One individual at a time viewed a film.
○Customers could view one film after another.
○Prizefights were the most popular subjects for films.
○Each film was short.
Paragraph 2: These Kinetoscope arcades were modeled on phonograph parlors, which hadproven successful for Edison several years earlier. In the phonograph parlors, customerslistened to recordings through individual ear tubes, moving from one machine to the next tohear different recorded speeches or pieces of music. The Kinetoscope parlors functioned in asimilar way. Edison was more interested in the sale of Kinetoscopes (for roughly $1,000 apiece)to these parlors than in the films that would be run in them (which cost approximately $10 to$15 each). He refused to develop projection technology, reasoning that if he made and soldprojectors, then exhibitors would purchase only one machine-a projector-from him instead ofseveral.
2. The author discusses phonograph parlors in paragraph 2 in order to
○Explain Edisons financial success
○Describe the model used to design Kinetoscope parlors
○Contrast their popularity to that of Kinetoscope parlors
○Illustrate how much more technologically advanced Kinetoscope parlors were
3. Which of the sentences below best expresses the essential information in the highlightedsentence from the passage?
Incorrect answer choices change the meaning in important ways or leave out essentialinformation.
○Edison was more interested in developing a variety of machines than in developing atechnology based on only one.
○Edison refused to work on projection technology because he did not think exhibitors wouldreplace their projectors with newer machines.
○Edison did not want to develop projection technology because it limited the number ofmachines he could sell.
○Edison would not develop projection technology unless exhibitors agreed to purchase morethan one projector from him.
Paragraph 3: Exhibitors, however, wanted to maximize their profits, which they could do morereadily by projecting a handful of films to hundreds of customers at a time (rather than one at atime) and by charging 25 to 50 cents admission. About a year after the opening of the firstKinetoscope parlor in 1894, showmen such as Louis and Auguste Lumiere, Thomas Armat andCharles Francis Jenkins, and Orville and Woodville Latham (with the assistance of Edisonsformer assistant, William Dickson) perfected projection devices. These early projection deviceswere used in vaudeville theaters, legitimate theaters, local town halls, makeshift storefronttheaters, fairgrounds, and amusement parks to show films to a mass audience.
4. The word readily in the passage is closest in meaning to
○Frequently
○Easily
○Intelligently
○Obviously
5. The word assistance in the passage is closest in meaning to
○Criticism
○Leadership
○Help
○Approval
Paragraph 4: With the advent of projection in 1895-1 896, motion pictures became theultimate form of mass consumption. Previously, large audiences had viewed spectacles at thetheater, where vaudeville, popular dramas, musical and minstrel shows, classical plays,lectures, and slide-and-lantern shows had been presented to several hundred spectators at atime. But the movies differed significantly from these other forms of entertainment, whichdepended on either live performance or (in the case of the slide-and-lantern shows) the activeinvolvement of a master of ceremonies who assembled the final program.
6. According to paragraph 4, how did the early movies differ from previous spectacles thatwere presented to large audiences?
○They were a more expensive form of entertainment.
○They were viewed by larger audiences.
○They were more educational.
○They did not require live entertainers.
Paragraph 5: Although early exhibitors regularly accompanied movies with live acts, thesubstance of the movies themselves is mass-produced, prerecorded material that can easily bereproduced by theaters with little or no active participation by the exhibitor. Even though earlyexhibitors shaped their film programs by mixing films and other entertainments together inwhichever way they thought would be most attractive to audiences or by accompanying themwith lectures* their creative control remained limited. What audiences came to see was thetechnological marvel of the movies; the lifelike reproduction of the commonplace motion oftrains, of waves striking the shore, and of people walking in the street; and the magic madepossible by trick photography and the manipulation of the camera.
7. According to paragraph 5, what role did early exhibitors play in the presentation of moviesin theaters?
○They decided how to combine various components of the film program.
○They advised film-makers on appropriate movie content.
○They often took part in the live-action performances.
○They produced and prerecorded the material that was shown in the theaters.
Paragraph 6: With the advent of projection, the viewers relationship with the image was nolonger private, as it had been with earlier peepshow devices such as the Kinetoscope and theMutoscope, which was a similar machine that reproduced motion by means of successive imageson individual photographic cards instead of on strips of celluloid. It suddenly became public-anexperience that the viewer shared with dozens, scores, and even hundreds of others. At thesame time, the image that the spectator looked at expanded from the minuscule peepshowdimensions of 1 or 2 inches (in height) to the life-size proportions of 6 or 9 feet.
8. Which of the following is mentioned in paragraph 6 as one of the ways the Mutoscopediffered from the Kinetoscope?
○Sound and motion were simultaneously produced in the Mutoscope.
○More than one person could view the images at the same time with the Mutoscope.
○The Mutoscope was a less sophisticated earlier prototype of the Kinetoscope.
○A different type of material was used to produce the images used in the Mutocope.
9. The word it in the passage refers to
○The advent of projection
○The viewers relationship with the image
○A similar machine
○Celluloid
10. According to paragraph 6, the images seen by viewers in the earlier peepshows, comparedto the images projected on the screen, were relatively
○Small in size
○Inexpensive to create
○Unfocused
○Limited in subject matter
11. The word expanded in the passage is closest in meaning to
○Was enlarged
○Was improved
○Was varied
○Was rejected
Paragraph 3: ■Exhibitors, however, wanted to maximize their profits, which they could domore readily by projecting a handful of films to hundreds of customers at a time (rather thanone at a time) and by charging 25 to 50 cents admission. ■About a year after the opening ofthe first Kinetoscope parlor in 1894, showmen such as Louis and Auguste Lumiere, ThomasArmat and Charles Francis Jenkins, and Orville and Woodville Latham (with the assistance ofEdisons former assistant, William Dickson) perfected projection devices. ■These earlyprojection devices were used in vaudeville theaters, legitimate theaters, local town halls,makeshift storefront theaters, fairgrounds, and amusement parks to show films to a massaudience.■
12. Look at the four squares [■] that indicate where the following sentence can be added tothe passage.
When this widespread use of projection technology began to hurt his Kinetoscope business,Edison acquired a projector developed by Armat and introduced it as “Edison’s latest marvel,the Vitascope."
Where would the sentence best fit?
13. 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 mostimportant ideas in the passage. Some answer choices do not belong in the summary becausethey express ideas that are not presented in the passage or are minor ideas in the passage.This question is worth 2 points.
The technology for modern cinema evolved at the end of the nineteenth century.
●
●
●
Answer Choices
1. Kinetoscope parlors for viewing films were modeled on phonograph parlors.
2. Thomas Edisons design of the Kinetoscope inspired the development of large screenprojection.
3. Early cinema allowed individuals to use special machines to view films privately.
4. Slide-and-lantern shows had been presented to audiences of hundreds of spectators.
5. The development of projection technology made it possible to project images on a largescreen.
6. Once film images could be projected, the cinema became form of mass consumption.
參考答案：
1. ○3
This is a Negative Factual Information question asking for specific information that can befound in paragraph l. Choice 3 is the correct answer. The paragraph does mention that oneviewer at a time could view the films (choice 1), that films could be viewed one after another(choice 2), and that films were short (choice 4). Prizefights are mentioned as one subject ofthese short films, but not necessarily the most popular one.
2. ○2
This is a Rhetorical Purpose question. It asks why the author mentions "phonograph parlors" inparagraph 2. The correct answer is choice 2. The author is explaining why Edison designed hisarcades like phonograph parlors; that design had been successful for him in the past. Theparagraph does not mention the phonograph parlors to explain Edisons financial success, sochoice 1 is incorrect. The paragraph does not directly discuss the situations described in choices3 and 4, so those answers too are incorrect.
3. ○3
This is a Sentence Simplification question. As with all of these items, a single sentence in thepassage is highlighted:
He refused to develop projection technology, reasoning that if he made and sold projectors,then exhibitors would purchase only one machine-a projector-from him, instead of several.
The correct answer is choice 3. That choice contains all of the essential ideas in the highlightedsentence. It is also the only choice that does not change the meaning of the sentence. Choice 1says that Edison was more interested in developing a variety of machines, which is not true.Choice 2 says that the reason Edison refused to work on projection technology was thatexhibitors would never replace the projectors. That also is not true; the highlighted sentenceimplies that he refused to do this because he wanted exhibitors to buy several Kinetoscopemachines at a time instead of a single projector. Choice 4 says that Edison refused to developprojection technology unless exhibitors agreed to purchase more that one projector fromhim. The highlighted sentence actually says that Edison had already reasoned or concluded thatexhibitors would not buy more than one, so choice 4 is a change in essential meaning.
4. ○2
This is a Vocabulary question. The word being tested is readily. It is highlighted in the passage.Readily means "easily," so choice 2 is the correct answer. The other choices do not fit in thecontext of the sentence.
5. ○3
This is a Vocabulary question. The word being tested is assistance; it is highlighted in thepassage. An assistant is a person who helps a leader, so choice 3, "help," is the correct answer.
6. ○4
This is a Factual Informal-ion question asking for specific information that can be found inparagraph 4. The correct answer is choice 4. Early movies were different from previousspectacles because they did not require live actors. The paragraph states (emphasis added):
"But the movies differed significantly from these other forms of entertainment, whichdepended on either live performance or (in the case of the slide-and-lantern shows) the activeinvolvement of a master of ceremonies who assembled the final program."
So the fact that previous spectacles depended on live performances is explicitly stated as oneof the ways (but not the only way) that those earlier entertainments differed from movies. Theother answer choices are not mentioned in the paragraph.
7. ○1
This is a Factual Information question asking for specific information that can be found inparagraph 5. The correct answer is choice 1, "They decided how to combine variouscomponents of the film program," because that idea is stated explicitly in the paragraph:
"Early exhibitors shaped their film programs by mixing films and other entertainmentstogether."
The other choices, while possibly true, are not explicitly mentioned in the paragraph as beingamong the exhibitors roles.
8. ○4
This is a Factual Information question asking for specific information that can be found inparagraph 6. The correct answer is choice 4, "A different type of material was used to producethe images used in the Mutoscope." The paragraph says that these machines were very similarbut that they differed in one particular way:
". . . the Mutoscope, which was a similar machine that reproduced motion by means ofsuccessive images on individual photographic cards instead of on strips of celluloid."
9. ○2
This is a Reference question. The word being tested is it. That word is highlighted in thepassage. Choice 2, "the viewers relationship with the image," is the correct answer. This is asimple-pronoun referent item. The sentence says that "it" suddenly became "public," whichimplies that whatever "it" is, it was formerly private. The paragraph says that the "viewersrelationship to the image was no longer private," so that relationship is the "it" referred to here.
10. ○1
This is a Factual Information question asking for specific information that can be found inparagraph 6. The correct answer is choice 1. The paragraph says that the images expandedfrom an inch or two to life-size proportions, so "small in size" must be correct. The paragraphdoes not mention the other choices.
11. ○1
This is a Vocabulary Question. The word being tested is expanded. It is highlighted in thepassage. Choice 1, "was enlarged," is the correct answer. If something expanded, it grew or gotbigger. "Enlarged" also means "grew or got bigger."
12. ○4
This is an Insert Text question. You can see the four black squares in paragraph 3 thatrepresent the possible answer choices here.
■ Exhibitors, however, wanted to maximize their profits, which they could do more readily byprojecting a handful of films to hundreds of customers at a time (rather than one at a time) andby charging 25 to 50 cents admission. ■About a year after the opening of the first Kinetoscopeparlor in 1894, showmen such as Louis and Auguste Lumiere, Thomas Armat and CharlesFrancis Jenkins, and Orville and Woodville Latham (with the assistance of Edisons formerassistant, William Dickson) perfected projection devices. ■These early projection devices wereused in vaudeville theaters, legitimate theaters, local town halls, makeshift storefront theaters,fairgrounds, and amusement parks to show films to a mass audience. ■
The ed sentence fits best at square 4 because it represents the final result of the generaluse of projectors. After projectors became popular, Edison lost money, and although he hadpreviously refused to develop projection technology, now be was forced to do so. To place thesentence anyplace else would interrupt the logical narrative sequence of the eventsdescribed. None of the sentences in this paragraph can logically follow the ed sentence,so squares 1, 2, and 3 are all incorrect.
13.○3 5 6
This is a Prose Summary question. It is completed correctly below. The correct choices are 3, 5,and 6. Choices 1, 2, and 4 are therefore incorrect.
電影院的播放技術(shù)從最初的西洋鏡形式演變?yōu)閷⒂跋裢队暗接陌档挠霸浩聊�，這一轉(zhuǎn)變使得電影院大眾化消費(fèi)成為可能。在通過西洋鏡播放電影的年代里，人們只能通過播放儀器的一個(gè)專門設(shè)置的小窗口來看電影。到了1894年，托馬斯?愛迪生發(fā)明的活動(dòng)電影放映機(jī)公布于眾，這種放映機(jī)僅適用于活動(dòng)電影放映室或電影娛樂城。它里面僅包含少量的獨(dú)立播放器，每次僅允許一個(gè)顧客觀看一部50張膠卷的小短片。第一個(gè)電影放映廳的放映機(jī)中有五臺(tái)播放器。價(jià)格是25美分/次，(每臺(tái)播放器觀看價(jià)格是5美分)。觀眾們從一個(gè)播放器換到下一個(gè)播放器依次觀看不同的影片(就像有名的職業(yè)拳擊賽，每場都要連續(xù)進(jìn)行好幾輪比賽)。
這些電影播放廳是仿照留聲機(jī)播放廳設(shè)計(jì)的，這也證明了愛迪生前幾年的設(shè)計(jì)非常成功。在留聲機(jī)播放廳中，顧客們通過獨(dú)立的耳管聽取已經(jīng)錄制好的聲音，從一臺(tái)機(jī)器換到另一臺(tái)聽取不同演講或音樂的錄音。電影放映室的功能與之類似。相比之下，愛迪生對(duì)這些電影放映機(jī)(每臺(tái)一千美元)的銷售更感興趣，而不是那些需要放映的電影(每部10-15美元)。他不愿研究投影技術(shù)，因?yàn)樗J(rèn)為如果研發(fā)并且銷售投影機(jī)，電影放映者就只會(huì)買一臺(tái)投影機(jī)而不是幾臺(tái)。
然而，電影放映者們期望將自己的收益最大化，他們希望能更簡易地將少量電影同時(shí)放映給幾百個(gè)顧客(而不是每次為一個(gè)顧客播放一次電影)，每次收費(fèi)25到50美分。在1894年電影放映機(jī)公布的一年之后，攝影師如Louis和Auguste Lumiere，Thomas Armat和Charles Francis Jenkins，Orville和 Woodville Latham以及愛迪生先前的助手William Dickson將投影設(shè)備變得更加完善。這些早期的投影機(jī)在眾多場合為大眾觀眾播放電影，如：雜技劇團(tuán)、正當(dāng)?shù)挠霸�、�?dāng)?shù)劓?zhèn)上的禮堂、臨時(shí)的影院店面、露天游樂場和游樂園等。
隨著1895-1896年間投影機(jī)的到來，電影成為了大眾消費(fèi)的最終形式。在此之前，一群觀眾坐在劇場里觀看表演，在那里幾百個(gè)觀眾可以同時(shí)觀看輕歌舞劇、流行戲劇、音樂劇、歌唱表演、古典演奏、演講和膠片演示等。電影與這些娛樂形式明顯的`不同點(diǎn)是，電影無需依賴現(xiàn)場表演，也不需要串聯(lián)全場節(jié)目的主持人的積極參與(例如膠片演示)。
盡管早期的電影放映者通常在電影放映時(shí)伴有現(xiàn)場表演，但是電影本身的內(nèi)容是影院事先大量錄制下來的，這些材料能在沒有表演者或者表演者較少參與的情況在電影院中輕松地再現(xiàn)。即便這樣，早期的電影放映者還是將電影和其它娛樂節(jié)目或者演講結(jié)合在一起，他們認(rèn)為用這樣的方法能最大限度的吸引觀眾，他們管理的創(chuàng)造力還是非常有限的。觀眾們?cè)谶@里可以看到的電影技術(shù)的進(jìn)步;生活瑣事的重現(xiàn)，如火車的運(yùn)動(dòng)，海浪拍擊海岸，人們?cè)诮稚闲凶叩?以及由攝影特技和相機(jī)操控做出來的特效。
伴隨投影機(jī)的到來，電影不在屬于個(gè)別人的消費(fèi)品。就像之前西洋鏡時(shí)代的播放設(shè)備，如活動(dòng)電影播放機(jī)和早期電影播放機(jī)，早期電影播放機(jī)播放的都是一系列獨(dú)立的圖像而不是膠片，把單個(gè)攝影卡上的圖片串聯(lián)起來形成影像。投影技術(shù)使得電影變得更加大眾化了，觀眾能夠和十二個(gè)、二十個(gè)、甚至是上百個(gè)人共同觀看一部電影。與此同時(shí)，觀眾所看到的圖像大小也從狹小的1英寸或2英寸西洋鏡高度擴(kuò)展到與實(shí)物狀的6英尺或9英尺。
新托福閱讀理解考試練習(xí)及參考譯文 2
閱讀文章
The process of biological evolution has been a subject of intense study for centuries. One of the key aspects of evolution is the concept of natural selection, which was first proposed by Charles Darwin. Natural selection is the process by which organisms that are better adapted to their environment are more likely to survive and reproduce, passing on their advantageous traits to their offspring.
In a particular ecosystem, there are two types of birds: those with long beaks and those with short beaks. The main food source in this ecosystem is insects that live in the bark of trees. Birds with long beaks are better able to reach these insects, as their beaks can penetrate deeper into the bark. As a result, during a period of drought when food is scarce, the long - beaked birds have a higher survival rate. They are more likely to find enough food to stay alive and reproduce. Over time, the proportion of long - beaked birds in the population increases.
Another important factor in evolution is genetic variation. Genetic variation within a species provides the raw material for natural selection to act upon. Mutations, which are random changes in an organisms DNA, can introduce new traits. For example, a mutation in a plant might cause it to develop a new color of flowers. If this new color attracts more pollinators, the plant with the mutation will have a higher chance of reproducing, and the new trait may spread throughout the population.
However, evolution is not always a straightforward process. There are also factors that can limit or disrupt the process of natural selection. One such factor is genetic drift. Genetic drift is the random change in the frequency of alleles (different forms of a gene) in a small population. In a small group of animals, for instance, if by chance a few individuals with a particular allele die or fail to reproduce, the frequency of that allele in the population can change significantly. This can sometimes lead to the loss of beneficial alleles or the spread of less - advantageous ones, even if they are not favored by natural selection.
閱讀題目
1.According to the passage, what is natural selection?
A. The process by which organisms randomly change their traits.
B. The process where organisms with advantageous traits are more likely to survive and reproduce.
C. The process of genetic drift in a population.
D. The process of mutations in an organisms DNA.
2.Why do long - beaked birds have a higher survival rate during a drought in the described ecosystem?
A. They can fly faster to find food.
B. Their long beaks allow them to reach insects in the tree bark more easily.
C. They can store more food in their beaks.
D. They are more resistant to the effects of drought.
3.What role does genetic variation play in evolution?
A. It has no impact on evolution.
B. It provides the material for natural selection to act upon.
C. It always leads to the development of harmful traits.
D. It only occurs in large populations.
4.What is genetic drift?
A. The process of organisms adapting to their environment.
B. The non - random change in the frequency of alleles in a population.
C. The random change in the frequency of alleles in a small population.
D. The process of mutations that introduce new alleles.
5.Which of the following statements is true according to the passage?
A. Evolution is always a smooth and predictable process.
B. Mutations are always beneficial to an organism.
C. Genetic drift can sometimes disrupt the process of natural selection.
D. Natural selection has no connection with the environment.
參考譯文
幾個(gè)世紀(jì)以來，生物進(jìn)化過程一直是深入研究的課題。進(jìn)化的關(guān)鍵方面之一是自然選擇的概念，這一概念最早由查爾斯達(dá)爾文提出。自然選擇是指那些更適應(yīng)環(huán)境的生物更有可能生存和繁殖，將其有利特征傳遞給后代的過程。
在一個(gè)特定的生態(tài)系統(tǒng)中，有兩種鳥類：長喙鳥和短喙鳥。這個(gè)生態(tài)系統(tǒng)中的主要食物來源是生活在樹皮中的昆蟲。長喙鳥能夠更好地獲取這些昆蟲，因?yàn)樗鼈兊泥箍梢愿畹夭迦霕淦�。因此，在干旱時(shí)期食物匱乏時(shí)，長喙鳥的存活率更高。它們更有可能找到足夠的食物來維持生存和繁殖。隨著時(shí)間的推移，長喙鳥在種群中的比例增加。
進(jìn)化中的另一個(gè)重要因素是遺傳變異。物種內(nèi)部的遺傳變異為自然選擇提供了原材料。突變，即生物體 DNA 中的隨機(jī)變化，可以引入新的特征。例如，植物的突變可能使其開出新顏色的花朵。如果這種新顏色吸引更多的傳粉者，帶有突變的植物就有更高的繁殖機(jī)會(huì)，新特征可能會(huì)在種群中傳播開來。
然而，進(jìn)化并不總是一個(gè)簡單直接的過程。也存在一些因素會(huì)限制或干擾自然選擇的過程。其中一個(gè)因素是遺傳漂變。遺傳漂變是指在小種群中，等位基因（基因的'不同形式）頻率的隨機(jī)變化。例如，在一小群動(dòng)物中，如果碰巧有幾個(gè)帶有特定等位基因的個(gè)體死亡或未能繁殖，該等位基因在種群中的頻率可能會(huì)發(fā)生顯著變化。這有時(shí)會(huì)導(dǎo)致有益等位基因的丟失或不太有利的等位基因的傳播，即使它們不受自然選擇的青睞。
閱讀題目答案及解析
1.答案：B
解析：文章明確提到 “Natural selection is the process by which organisms that are better adapted to their environment are more likely to survive and reproduce, passing on their advantageous traits to their offspring.”，選項(xiàng) B 與原文表述一致。A 選項(xiàng)中 “randomly change their traits” 錯(cuò)誤，自然選擇不是隨機(jī)改變性狀；C 選項(xiàng)遺傳漂變與自然選擇是不同概念；D 選項(xiàng)突變是引入新性狀，并非自然選擇的定義。
2.答案：B
解析：根據(jù)文章 “The main food source in this ecosystem is insects that live in the bark of trees. Birds with long beaks are better able to reach these insects, as their beaks can penetrate deeper into the bark. As a result, during a period of drought when food is scarce, the long - beaked birds have a higher survival rate.” 可知，長喙鳥在干旱時(shí)存活率高是因?yàn)槠溟L喙能更輕松地獲取樹皮中的昆蟲，B 選項(xiàng)正確。A 選項(xiàng)文章未提及長喙鳥飛行速度；C 選項(xiàng)長喙鳥不是因?yàn)槟茉卩怪袃?chǔ)存更多食物；D 選項(xiàng)長喙鳥并非更抗干旱影響。
3答案：B
解析：原文提到 “Genetic variation within a species provides the raw material for natural selection to act upon.”，所以遺傳變異為自然選擇提供作用的材料，B 選項(xiàng)正確。A 選項(xiàng)與原文相悖；C 選項(xiàng)突變不一定總是產(chǎn)生有害性狀；D 選項(xiàng)遺傳變異在大小種群中都可能發(fā)生。
4.答案：C
解析：文中指出 “Genetic drift is the random change in the frequency of alleles (different forms of a gene) in a small population.”，C 選項(xiàng)符合定義。A 選項(xiàng)適應(yīng)環(huán)境是自然選擇相關(guān)，不是遺傳漂變；B 選項(xiàng) “non - random change” 錯(cuò)誤，遺傳漂變是隨機(jī)變化；D 選項(xiàng)突變引入新等位基因，遺傳漂變是等位基因頻率變化，概念不同。
5.答案：C
解析：從文章 “However, evolution is not always a straightforward process. There are also factors that can limit or disrupt the process of natural selection. One such factor is genetic drift.” 可知，遺傳漂變會(huì)干擾自然選擇過程，C 選項(xiàng)正確。A 選項(xiàng)進(jìn)化不總是順利可預(yù)測的；B 選項(xiàng)突變不總是有益的；D 選項(xiàng)自然選擇與環(huán)境密切相關(guān)。
【新托福閱讀理解考試練習(xí)及參考譯文】相關(guān)文章：
托福閱讀理解練習(xí)題05-12
備考托福閱讀理解題練習(xí)201704-13
2017年托�？荚囬喿x理解專項(xiàng)練習(xí)及答案06-04
2017托福閱讀考試沖刺練習(xí)03-08
托福閱讀理解試題04-10