【正文】 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. ，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。 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(huì)沒有興趣在戰(zhàn)場上相遇的話，我都倍感詫異。這也許就是困難之所在。 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(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。 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. ，三十五歲以上，并且在美國居住了至少十四年。 86. 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。他的高級作文課上的學(xué)生覺得他在課上古板得可怕，但私下交流卻富有同情和理解。 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(dá)的手段和交流的載體并因此成為聯(lián)系他人的有力工具。 79. The practice of making excellent films based on rather obscure novels has been going on so long in the United States as to constitute a tradition. ，已經(jīng)成為傳統(tǒng)。 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。 71. People in prehistoric times created paints by grinding materials such as plants and clay into power and then adding water. ，然后加水。 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。 63. The human skeleton consists of more than two hundred bones bound together by tough and relatively inelastic connective tissues called ligaments. ，住些骨頭石油堅(jiān)韌而相對缺乏彈性的，被稱為韌帶的結(jié)蒂組連在一起。 59. Before staring on a sea voyage, prudent navigators learn the sea charts, study the sailing directions, and memorize lighthouse 本地s to prepare themselves for any conditions they might encounter. ，會(huì)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。 55. The history of painting is a fascinating chain of events that probably began with the very first pictures ever made. ，其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. 。 44. No social crusade aroused Elizabeth Williams39。 41. The annual worth of Utah39。s的影響巨大，所以一些權(quán)威部門認(rèn)定她為美國女權(quán)運(yùn)動(dòng)的創(chuàng)始人。拒絕一切傳統(tǒng)，試圖通過強(qiáng)調(diào)機(jī)械和動(dòng)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。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)。 22. The chief foods eaten in any country depend largely on what grows best in its climate and soil. ，大體取決于什么作物在其天氣和土壤條件下生長得最好。 18. Fungi are important in the process of decay, which returns ingredients to the soil, enhances soil fertility, and deposes animal debris. ，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。 14. Long before children are able to speak o