【正文】 in automobile production.。61. Buyers and sellers should be aware of new developments in technology can and does affect marketing activities.，原因很簡單，因為技術(shù)能夠并且已經(jīng)影響著營銷活動?！　?9. Snow aids farmers by keeping heart in the lower ground levels, thereby saving the seeds from freezing.，因為它保持地層土壤的溫度，使種子不致凍死?！　?7. Poodles were once used as retrievers in duck hunting, but the American Kennel Club does not consider them sporting dogs because they are now primarily kept as pets.，但是美國Kennel Club卻不承認它們?yōu)楂C犬，因為它們現(xiàn)在大多數(shù)作為寵物飼養(yǎng)?！　?4. His teaching began at the Massachusetts Institute of Technology, but William Rainey Harper lured him to the new university of Chicago, where he remained officially for exactly a generation and where his students in advanced position found him terrifyingly frigid in the classroom but sympathetic and understanding in their personal conferences.，但是William Rainey Harper把他吸引到了新成立的芝加哥大學。　　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.，真正艱難的任務(wù)還沒有開始；即危險，吃力，需要傷筋動骨和吵吵嚷嚷的建造這些鐵路的實際工作。不過他們并不是刻意去追求刺激的。　　99. 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?！　?7. 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。 they would devour all our crops and kill our flocks and herds, if it were not for the protection we get from insecteating animals.；如果我們沒有受到以昆蟲為食的動物的保護，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?！　?6. Artificial flowers are used for scientific as well as for decorative purposes. They are made from a variety of materials, such as way and glass, so skillfully that they can scarcely be distinguished from natural flowers.，也可用于裝飾目的，它們可以用各種各樣的材料制成，臂如蠟和玻璃；其制作如此精巧，幾乎可以以假亂真。 it is a means of expression, as well as a vehicle for munication, and as such bees a powerful tool for reaching other human beings.；它是表達的手段和交流的載體并因此成為聯(lián)系他人的有力工具。　　75. 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?！　?7. 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。 51. Using many symbols makes it possible to put a large amount of inFORMation on a single map.?！　?3. It is the interaction between people, rather than the events that occur in their lives, that is the main focus of social psychology.，而不是他們各自生活中的事件。拒絕一切傳統(tǒng)，試圖通過強調(diào)機械和動態(tài)來美化生活?！　?8. Elizabeth Blackwell, the first woman medical doctor in the United States, founded the New York Infirmary, an institution that has always had a pletely female medical staff.28. Elizabeth Blackwell，美國第一個女醫(yī)生，創(chuàng)建了員工一直為女性紐約診所?！　?0. Although pecans are most plentiful in the southeastern part of the United States, they are found as far north as Ohio and Illinois.?！　?2. Billie Holiday’s repu