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    1. Typical of the grasslanddwellers of the continent is the American antelope, or pronghorn.
    1.美洲羚羊，或稱叉角羚，是該大陸典型的草原動(dòng)物。
    2. Of the millions who sawHaley’s comet in 1986, how many people will live long enough to see it returnin the twenty-first century.
    2. 1986年看見(jiàn)哈雷慧星的千百萬(wàn)人當(dāng)中，有多少人能夠長(zhǎng)壽到足以目睹它在二十一世紀(jì)的回歸呢?
    3. Anthropologists havediscovered that fear, happiness, sadness, and surprise are universallyreflected in facial expressions.
    3.人類學(xué)家們已經(jīng)發(fā)現(xiàn)，恐懼，快樂(lè)，悲傷和驚奇都會(huì)行之于色，這在全人類是共通的。
    4. Because of its irritatingeffect on humans, the use of phenol as a general antiseptic has been largelydiscontinued.
    4.由于苯酚對(duì)人體帶有刺激性作用，它基本上已不再被當(dāng)作常用的防腐劑了。
    5. In group to remain inexistence, a profit-making organization must, in the long run, producesomething consumers consider useful or desirable.
    5.任何盈利組織若要生存，最終都必須生產(chǎn)出消費(fèi)者可用或需要的產(chǎn)品。
    6. The greater the populationthere is in a locality, the greater the need there is for water,transportation, and disposal of refuse.
    6.一個(gè)地方的人口越多，其對(duì)水，交通和垃圾處理的需求就會(huì)越大。
    7. It is more difficult towrite simply, directly, and effectively than to employ flowery but vagueexpressions that only obscure one’s meaning.
    7.簡(jiǎn)明，直接，有力的寫(xiě)作難于花哨，含混而意義模糊的表達(dá)。
    8. With modern offices becomingmore mechanized, designers are attempting to personalize them with warmer, lesssevere interiors.
    8.隨著現(xiàn)代辦公室的日益自動(dòng)化，設(shè)計(jì)師們正試圖利用較為溫暖而不太嚴(yán)肅的內(nèi)部裝飾來(lái)使其具有親切感。
    9. The difference between libeland slander is that libel is printed while slander is spoken.
    9.誹謗和流言的區(qū)別在于前者是書(shū)面的，而后者是口頭的。
    10. The knee is the jointswhere the thigh bone meets the large bone of the lower leg.
    10.膝蓋是大腿骨和小腿脛的連接處。
    11. Acids are chemicalcompounds that, in water solution, have a sharp taste, a corrosive action onmetals, and the ability to turn certain blue vegetable dyes red.
    11.酸是一種化合物，它在溶于水時(shí)具有強(qiáng)烈的氣味和對(duì)金屬的腐蝕性，并且能夠使某些藍(lán)色植物染料變紅。
    12. Billie Holiday’s reputationas a great jazz-blues singer rests on her ability to give emotional depth toher songs.
    12. Billie Holiday’s作為一個(gè)爵士布魯斯樂(lè)杰出歌手的名聲建立在能夠賦予歌曲感情深度的能力。
    13. Essentially, a theory is anabstract, symbolic representation of what is conceived to be reality.
    13.理論在本質(zhì)上是對(duì)認(rèn)識(shí)了的現(xiàn)實(shí)的一種抽象和符號(hào)化的表達(dá)。
    14. Long before children areable to speak or understand a language, they communicate through facialexpressions and by making noises.
    14.兒童在能說(shuō)或能聽(tīng)懂語(yǔ)言之前，很久就會(huì)通過(guò)面部表情和靠發(fā)出噪聲來(lái)與人交流了。
    15. Thanks to modernirrigation, crops now grow abundantly in areas where once nothing but cacti andsagebrush could live.
    15.受當(dāng)代灌溉(技術(shù)設(shè)施)之賜，農(nóng)作物在原來(lái)只有仙人掌和蕎屬科植物才能生存的地方旺盛的生長(zhǎng)。
    16. The development ofmechanical timepieces spurred the search for more accurate sundials with whichto regulate them.
    16.機(jī)械計(jì)時(shí)器的發(fā)展促使人們尋求更精確的日晷，以便校準(zhǔn)機(jī)械計(jì)時(shí)器。
    17. Anthropology is a sciencein that anthropologists use a rigorous set of methods and techniques to documentobservations that can be checked by others.
    17.人類學(xué)是一門(mén)科學(xué)，因?yàn)槿祟悓W(xué)家采用一整套強(qiáng)有力的方法和技術(shù)來(lái)記錄觀測(cè)結(jié)果，而這樣記錄下來(lái)的觀測(cè)結(jié)果是供他人核查的。
    18. Fungi are important in theprocess of decay, which returns ingredients to the soil, enhances soilfertility, and decomposes animal debris.
    18.真菌在腐化過(guò)程中十分重要，而腐化過(guò)程將化學(xué)物質(zhì)回饋于土壤，提高其肥力，并分解動(dòng)物糞便。
    19. When it is struck, a tuningfork produces an almost pure tone, retaining its pitch over a long period oftime.
    19.音叉被敲擊時(shí)，產(chǎn)生幾乎純質(zhì)的音調(diào)，其音量經(jīng)久不衰。
    20. Although pecans are mostplentiful in the southeastern part of the United States, they are found as farnorth as Ohio and Illinois.
    20.雖然美洲山河桃樹(shù)*集中于美國(guó)的東南部但是在北至俄亥俄州及伊利諾州也能看見(jiàn)它們。
    21. Eliminating problems bytransferring the blame to others is often called scape-goating.
    21.用怪罪別人的辦法來(lái)解決問(wèn)題通常被稱為尋找替罪羊。
    22. The chief foods eaten inany country depend largely on what grows best in its climate and soil.
    22.一個(gè)國(guó)家的主要食物是什么，大體取決于什么作物在其天氣和土壤條件下生長(zhǎng)得*好。
    23. Over a very large number oftrials, the probability of an event’s occurring is equal to the probabilitythat it will not occur.
    23.在大量的實(shí)驗(yàn)中，某一事件發(fā)生的幾率等于它不發(fā)生的幾率。
    24. Most substance contractwhen they freeze so that the density of a substance’s solid is higher than thedensity of its liquid.
    24.大多數(shù)物質(zhì)遇冷收縮，所以他們的密度在固態(tài)時(shí)高于液態(tài)。
    25. The mechanism by whichbrain cells store memories is not clearly understood.