【正文】 為它們現(xiàn)在大多數(shù)作為寵物飼養(yǎng)?！　?5. The sloth pays such little attention to its personal hygiene that green algae grow on its coarse hair and munities of a parasitic moth live in the depths of its coat producing caterpillars which graze on its mouldy hair. Its muscles are such that it is quits incapable of moving at a speed of over a kilometer an hour even over the shortest distances and the swiftest movement it can make is a sweep of its hooked arm.　　，以至于它粗糙的毛發(fā)上生出綠苔，成群的寄生蛾生長在它的皮毛深處，變成毛毛蟲，并以它的臟毛為食?！　?9. 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.　　，藝術(shù)博物館在考慮購買和接受捐贈的藝術(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。不過他們并不是刻意去追求刺激的?！　?9. It has been found that certain bats emit squeaks and by receiving the echoes, they can locate and steer clear of obstaclesor locate flying insects on which they feed. This echolocation in bats is often pared with radar, the principle of which is similar.　　，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。　　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.　　，說世界各地的普通人只要能在足球場或板球場上相遇就會沒有興趣在戰(zhàn)場上相遇的話，我都倍感詫異。如果我們沒有受到以昆蟲為食的動物的保護(hù)，昆蟲就會吞嚼掉我們所有的莊稼并殺死我們飼養(yǎng)的禽獸?！　?8. 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.　　，真正艱難的任務(wù)還沒有開始。他在那里正式任職長達(dá)整整一代人的時間?！　?5. Though once quite large, the population of the bald eagle across North America has drastically declined in the past forty years.　　，但在近四十年中全北美的禿頭鷹數(shù)量急劇下降。　　67. Scientists do not know why dinosaurs became extinct, but some theories postulate that changers in geography, climate, and sea levels were responsible.　　，但是一些理論推斷是地理，氣候和海平面的變化造成的?！　?9. Before staring on a sea voyage, prudent navigators learn the sea charts, study the sailing directions, and memorize lighthouse locations to prepare themselves for any conditions they might encounter.　　，會研究航向，記錄的燈塔的位置，以便對各種可能出現(xiàn)的情況做到有備無患。 enthusiasm more than the expansion of educational facilities for immigrants to the United States.給美國的新移民增加教育設(shè)施比任何社會運動都更多的激發(fā)了Elizabeth Williams的熱情.45. Quails typically have short rounded wings that enable them to spring into full flight instantly when disturbed in their hiding places.典型的鵪鶉都長有短而圓的翅膀，憑此他們可以在受驚時一躍而起，飛離它們的躲藏地.46. According to anthropologists, the earliest ancestors of humans that stood upright resembled chimpanzees facially, with sloping foreheads and protruding brows.根據(jù)人類學(xué)家的說法，直立行走的人的鼻祖面部輪廓與黑猩猩相似，額頭后傾，眉毛突出.47. Not until 1866 was the fully successful transatlantic cable finally laid.直到1866年第一條橫跨大西洋的電纜才完全成功的架通.48. In his writing, John Crowe Ransom describes what he considers the spiritual barrenness of society brought about by science and technology.John Crowe Ransom在他的著作中描述了他認(rèn)為是由科學(xué)技術(shù)給社會帶來的精神貧困.49. Children with parents whose guidance is firm, consistent, and rational are inclined to possess high levels of selfconfidence.父母的教導(dǎo)如果堅定，始終如一和理性，孩子就有可能充滿自信.50. The ancient Hopewell people of North America probably cultivated corn and other crops, but hunting and gathering were still of critical importance in their economy.北美遠(yuǎn)古的Hopewell人很可能種植了玉米和其他農(nóng)作物，但打獵和采集對他們的經(jīng)濟(jì)貿(mào)易仍是至關(guān)重要的.51. Using many symbols makes it possible to put a large amount of information on a single map.　　。s meaning.簡明，直接，有力的寫作難于花哨，含混而意義模糊的表達(dá).8. With modern offices being more mechanized, designers are attempting to persona