【導(dǎo)讀】美洲羚羊，或稱叉角羚，是該大陸典型的草原動(dòng)物。1986年看見哈雷慧星的千百萬人當(dāng)中，有多少人能夠長壽到足以目睹它在二十一世紀(jì)的回歸呢？人類學(xué)家們已經(jīng)發(fā)現(xiàn)，恐懼，快樂，悲傷和驚奇都會(huì)行之于色，這在全人類是共通的。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。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。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。簡(jiǎn)明，直接，有力的寫作難于花哨，含混而意義模糊的表達(dá)。誹謗和流言的區(qū)別在于前者是書面的，而后者是口頭的。膝蓋是大腿骨和小腿脛的連接處。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。的觀測(cè)結(jié)果是供他人核查的。真菌在腐化過程中十分重要，而腐化過程將化學(xué)物質(zhì)回饋于土壤，提高其肥力，并分解動(dòng)物糞便。雖然美洲山河桃樹最集中于美國的東南部但是在北至俄亥俄州及伊利諾州也能看見它們。

　　

【正文】 材料制成，臂如蠟和玻璃；其制作如此精巧，幾乎可以以假亂真。 87. Three years of research at an abandoned coal mine in Argonne， Illinois， have resulted in findings that scientists believe can help reclaim thousands of mine disposal sites that scar the coalrich regions of the United States. 在伊利諾州 Angonne 市的一個(gè)廢棄煤礦的三年研究取得了成果，科學(xué)家們相信這些成果可以幫助改造把美國產(chǎn)煤區(qū)弄得傷痕累累的數(shù)千個(gè)舊煤場(chǎng)。 88. When the persuading and the planning for the western railroads had finally been pleted， the really challenging task remained： the dangerous， sweaty， backbreaking，brawling business of actually building the lines. 當(dāng)有關(guān)西部鐵路的說服和規(guī)劃工作終于完成后，真正艱難的任務(wù)還沒有開始；即危險(xiǎn)，吃力，需要傷筋動(dòng)骨和吵吵嚷嚷的建造這些鐵路 的實(shí)際工作。 89. Because of the space crunch， the Art Museum has bee increasingly cautious in considering acquisitions and donations of art， in some cases passing up opportunities to strengthen is collections. 由于空間不足，藝術(shù)博物館在考慮購買和接受捐贈(zèng)的藝術(shù)品是越來越慎重，有些情況下放棄其進(jìn)一步改 善收藏的機(jī)會(huì)。 90. The United States Constitution requires that President be a naturalborn citizen，thirtyfive years of age or older， who has lived in the United States for a minimum of fourteen years. 美國憲法要求總統(tǒng)是生于美國本土的公民，三十五歲以上，并且在美國居住了至少十四年。 91. Arid regions in the southwestern United States have bee increasingly inviting playgrounds for the growing number of recreation seekers who own vehicles such as motorcycles or powered trail bikes and indulge in hillclimbing contests or in caving new trails in the desert. 美國西部的不毛之地正成為玩耍的地方，對(duì)越來越多擁有摩托車或越野單車類車輛的，喜歡放縱于爬坡比賽或開辟新的沙漠通道的尋歡作樂者具有不斷增長的吸引力。 92. Stone does decay， and so tools of long ago have remained when even the bones of the man who made them have disappeared without trace. 石頭不會(huì)腐爛，所以以前的（石器）工具能保存下來 ，雖然它們的制造者已經(jīng)消失的無影無蹤。 93. Insects would make it impossible for us to live in the world； they would devour all our crops and kill our flocks and herds， if it were not for the protection we get from insecteating animals. 昆蟲就將會(huì)使我們無法在這個(gè)世界上居住；如果我們沒有受到以昆蟲為食的動(dòng) 物的保護(hù)，昆蟲就會(huì)吞嚼掉我們所有的莊稼并殺死我們飼養(yǎng)的禽獸。 94. It is true that during their explorations they often faced difficulties and dangers of the most perilous nature， equipped in a manner which would make a modern climber shudder at the thought， but they did not go out of their way to court such excitement. 確實(shí)，他們?cè)谔诫U(xiǎn)中遇到了極具威脅性的困難和危險(xiǎn)，而他們的裝備會(huì)讓一個(gè)現(xiàn)代登山者想一想都會(huì)渾身顫栗。不過他們并不是刻意去追求刺激的。 95. There is only one difference between an old man and a young one： the young man has a glorious future before him and old one has a splendid future behind him： and maybe that is where the rub is. 老人和年輕人之間只有一個(gè)區(qū)別：年輕人的前面有輝煌的未來，老年人燦爛的未來卻已在它們身后。這也許就是困難之所在。 96. I find young people exciting. They have an air of freedom， and they have not a dreary mitment to mean ambitions or love fort. They are not anxious social climbers， and they have no devotion to material things. 我們位年強(qiáng)人振奮。它們帶有自由的氣息，他們不會(huì)為狹隘的野心和貪婪享受而孜孜以求。他們不是焦慮的向上爬的人，他們不會(huì)對(duì)物質(zhì)性的東西難舍難分。 97. I am always amazed when I hear people saying that sport creates goodwill between the nations， and that if only the mon peoples of the world could meet one another at football or cricket， they would have no inclination to meet on the battlefield. 每次我聽說體育運(yùn)動(dòng)能夠在國家間建立起友好感情，說世界各地的普通人只要能在足球場(chǎng)或板球場(chǎng)上相遇就會(huì)沒有興趣在戰(zhàn)場(chǎng)上相遇的話，我都倍感詫異。 98. It is impossible to say simply for the fun and exercise： as soon as the question of prestige arises， as soon as you feel that you and some larger unit will be disgraced if you lose，the most savage bative instincts are around. 沒有可能僅僅為了娛樂或鍛煉而運(yùn)動(dòng)：一旦有了問題，一旦你覺得你輸了你和你所屬團(tuán)體會(huì)有失體面時(shí)，你最野蠻的好斗本能就會(huì)被激發(fā)出 來。 99. It has been found that certain bats emit squeaks and by receiving the echoes， they can locate and steer clear of obstacles——or locate flying insects on which they feed. This echolocation in bats is often pared with radar， the principle of which is similar. 人們已經(jīng)發(fā)現(xiàn)，某些蝙蝠發(fā)出尖叫聲并靠接受回響來鎖定和避免障礙物 ——或者找到它們賴以為生的昆蟲。蝙蝠這種回響定位法常拿來和原理與之很相近似的雷達(dá)相比。 100. As the time and cost of making a clip drop to a few days and a few hundred dollars，engineers may soon be free to let their imaginations soar without being penalized by expensive failure. 隨著芯片制造時(shí)間和費(fèi)用降低到了幾天和幾百美元，工程師們可能很快可以任他們的想象馳騁而不會(huì)被昂貴的失敗所懲罰。