【正文】 源頭大概可以上溯到最早的圖畫。51. Using many symbols makes it possible to put a large amount of inFORMation on a single map. 。 47. Not until 1866 was the fully successful transatlantic cable finally laid. 。43. 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。39. The continental divide refers to an imaginary line in the North American Rockies that divides the waters flowing into the Atlantic Ocean from those flowing into the Pacific. ，該線把大西洋流域和太平洋流域區(qū)分開來。拒絕一切傳統(tǒng)，試圖通過強(qiáng)調(diào)機(jī)械和動態(tài)來美化生活。 32. That xenon could not FORM chemical pounds was once believed by scientists. ：氙氣是不能形成化合物的。 28. 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(gè)女醫(yī)生，創(chuàng)建了員工一直為女性紐約診所。24. Most substance contract when they freeze so that the density of a substance’s solid is higher than the density of its liquid. ，所以他們的密度在固態(tài)時(shí)高于液態(tài)。 20. Although pecans are most plentiful in the southeastern part of the United States, they are found as far north as Ohio and Illinois. 。 16. The development of mechanical timepieces spurred the search for more accurate sundials with which to regulate them. ，以便校準(zhǔn)機(jī)械計(jì)時(shí)器。 12. Billie Holiday’s reputation as a great jazzblues singer rests on her ability to give emotional depth to her songs. 12. Billie Holiday’s作為一個(gè)爵士布魯斯樂杰出歌手的名聲建立在能夠賦予歌曲感情深度的能力。 8. With modern offices being more mechanized, designers are attempting to personalize them with warmer, less severe interiors. ，設(shè)計(jì)師們正試圖利用較為溫暖而不太嚴(yán)肅的內(nèi)部裝飾來使其具有親切感。 4. Because of its irritating effect on humans, the use of phenol as a general antiseptic has been largely discontinued. ，它基本上已不再被當(dāng)作常用的防腐劑了。2. Of the millions who saw Haley’s et in 1986, how many people will live long enough to see it return in the twentyfirst century. 2. 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？ 3. Anthropologists have discovered that fear, happiness, sadness, and surprise are universally reflected in facial expressions. ，恐懼，快樂，悲傷和驚奇都會行之于色，這在全人類是共通的。 7. It is more difficult to write simply, directly, and effectively than to employ flowery but vague expressions that only obscure one’s meaning. ，直接，有力的寫作難于花哨，含混而意義模糊的表達(dá)。 11. Acids are chemical pounds that, in water solution, have a sharp taste, a corrosive action on metals, and the ability to turn certain blue vegetable dyes red. ，它在溶于水時(shí)具有強(qiáng)烈的氣味和對金屬的腐蝕性，并且能夠使某些藍(lán)色植物染料變紅。 15. Thanks to modern irrigation, crops now grow abundantly in areas where once nothing but cacti and sagebrush could live. (技術(shù)設(shè)施)之賜，農(nóng)作物在原來只有仙人掌和蕎屬科植物才能生存的地方旺盛的生長。19. When it is struck, a tuning fork produces an almost pure tone, retaining its pitch over a long period of time. ，產(chǎn)生幾乎純質(zhì)的音調(diào)，其音量經(jīng)久不衰。 23. Over a very large number of trials, the probability of an event’s occurring is equal to the probability that it will not occur. ，某一事件發(fā)生的幾率等于它不發(fā)生的幾率。 27. In the eastern part of New Jersey lies the city of Elizabeth, a major shipping and manufacturing center. ，一個(gè)重要的航運(yùn)和制造業(yè)中心，坐落于新澤西州的東部。31. Although apparently rigid, bones exhibit a degree of elasticity that enables the skeleton to withstand considerable impact. ，但它也有一定的彈性，使得骨骼能夠承受相當(dāng)?shù)拇驌簟?35. Futurism, an early twentiethcentury movement in art, rejected all traditions and attempted to glorify contemporary life by emphasizing the machine and motion. ，二十世紀(jì)早期的一個(gè)藝術(shù)思潮。 38. The activities of the international marketing researcher are frequently much broader than those of the domestic marketer. 。 42. The wallflower is so called because its weak stems often grow on walls and