【文章內(nèi)容簡介】 gh 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 many symbols makes it possible to put a large amount of inFORMation on a single map. 使用多種多樣的符號可以在一張地圖里放進(jìn)大量的信息52. Anarchism is a term describing a cluster of doctrines and attitudes whose principal uniting feature is the belief that government is both harmful and unnecessary.無政府主義這個詞描述的是一堆理論和態(tài)度，它們的主要共同點在于相信政府是有害的，沒有必要的53. Probably no man had more effect on the daily lives of most people in the Untied States than did Henry Ford a pioneer in automobile production.54. The use of wellchosen nonsense words makes possible the testing of many basic hypotheses in the field of language learning.使用精心挑選的無意義詞匯，可以檢驗語言學(xué)科里許多基本的假定55. The history of painting is a fascinating chain of events that probably began with the very first pictures ever made.優(yōu)化歷史是由一連串的迷人事件組成，其源頭大概可以上溯到最早的圖畫56. Perfectly matched pearls, strung into a necklace, bring a far higher price than the same pearls told individually.相互般配的珍珠，串成一條項鏈，就能賣到比單獨售出好得多的價錢57. During the eighteenth century, Little Turtle was chief of the Miami tribe whose territory became what is now Indiana and Ohio.十八世紀(jì)時，“小烏龜”是邁阿密部落的酋長，該部落的地盤就是今天的印第安那州和俄亥俄州58. Among almost seven hundred species of bamboo, some are fully grown at less than a foot high, while others can grow three feet in twentyfour hours.在竹子的近七百個品種中，有的全長成還不到一英尺，有的卻能在二十四小時內(nèi)長出三英尺59. 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.謹(jǐn)慎的航海員在出航前，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60. Of all the economically important plants, palms have been the least studied.在所有的經(jīng)濟(jì)作物中，棕櫚樹得到的研究最少61. Buyers and sellers should be aware of new developments in technology can and does affect marketing activities.購買者和銷售者都應(yīng)該留意技術(shù)的新發(fā)展，原因很簡單，因為技術(shù)能夠并且已經(jīng)影響著營銷活動62. The application of electronic controls made possible by the microprocessor and puter storage have multiplied the uses of the modern typewriter.電腦儲存和由于電子微處理機(jī)得以實現(xiàn)的電控運用成倍的增加了現(xiàn)代打字機(jī)的功能63. The human skeleton consists of more than two hundred bones bound together by tough and relatively inelastic connective tissues called ligaments.人類骨骼有二百多塊骨頭組成，住些骨頭石油堅韌而相對缺乏彈性的，被稱為韌帶的結(jié)蒂組連在一起64. The pigmentation of a pearl is influenced by the type of oyster in which it develops and by the depth, temperature, and the salt content of the water in which the oyster lives.珍珠的色澤受到作為其母體牡蠣種類及牡蠣生活水域的深度，溫度和含鹽度的制約65. Although mockingbirds superbly mimic the songs and calls of many birds, they can nonetheless be quickly identified as mockingbirds by certain aural clues.盡管模仿鳥學(xué)很多種鳥的鳴叫聲惟妙惟肖，但人類還是能夠依其聲音上的線索很快識別它們66. Not only can walking fish live out of water, but they can also travel short distances over land.鲇魚不僅可以離開水存活，還可以在岸上短距離移動67. Scientists do not know why dinosaurs became extinct, but some theories postulate that changers in geography, climate, and sea levels were responsible.科學(xué)家不知道恐龍為何絕種了，但是一些理論推斷是地理，氣候和海平面的變化造成的68. The science of horticulture, in which the primary concerns are maximum yield and superior quality, utilizes inFORMation derived from other sciences.主要目的在于豐富和優(yōu)質(zhì)的農(nóng)藝學(xué)利用了其他科學(xué)的知識69. Snow aids farmers by keeping heart in the lower ground levels, thereby saving the seeds from freezing.雪對農(nóng)民是一種幫助，因為它保持地層土壤的溫度，使種子不致凍死70. Even though the precise qualities of hero in literary words may vary over time, the basic exemplary function of the hero seems to remain constant.歷代文學(xué)作品中的英雄本色雖各有千秋，但其昭世功力卻是恒古不變的71. People in prehistoric times created paints by grinding materials such as plants and clay into power and then adding water.史前的人們制造顏料是將植物和泥土等原料磨成粉末，然后加水72. Often very annoying weeds, goldenrods crowd out less hardy plants and act as hosts to many insect pests.***花通常令人生厭，它擠走不那么頑強(qiáng)的植物，并找來很多害蟲73. Startin