【文章內(nèi)容簡(jiǎn)介】 flight instantly when disturbed in their hiding places.典型的鵪鶉都長(zhǎng)有短而圓的翅膀，憑此他們可以在受驚時(shí)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(lèi)學(xué)家的說(shuō)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(huì)帶來(lái)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(jiān)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(duì)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.　　?！　?2. 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.　　，它們的主要共同點(diǎn)在于相信政府是有害的，沒(méi)有必要的?！　?3. 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.　　?！　?4. The use of wellchosen nonsense words makes possible the testing of many basic hypotheses in the field of language learning.　　，可以檢驗(yàn)語(yǔ)言學(xué)科里許多基本的假定?！　?5. 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(huà)?！　?6. Perfectly matched pearls, strung into a necklace, bring a far higher price than the same pearls told individually.　　，串成一條項(xiàng)鏈，就能賣(mài)到比單獨(dú)售出好得多的價(jià)錢(qián)?！　?7. During the eighteenth century, Little Turtle was chief of the Miami tribe whose territory became what is now Indiana and Ohio.　　，“小烏龜”是邁阿密部落的酋長(zhǎng)，該部落的地盤(pán)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.　　，有的全長(zhǎng)成還不到一英尺，有的卻能在二十四小時(shí)內(nèi)長(zhǎng)出三英尺?！　?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(huì)研究航向，記錄的燈塔的位置，以便對(duì)各種可能出現(xiàn)的情況做到有備無(wú)患。　　60. Of all the economically important plants, palms have been the least studied.　　，棕櫚樹(shù)得到的研究最少?！?1. Buyers and sellers should be aware of new developments in technology can and does affect marketing activities.　　，原因很簡(jiǎn)單，因?yàn)榧夹g(shù)能夠并且已經(jīng)影響著營(yíng)銷(xiāo)活動(dòng)?！　?2. The application of electronic controls made possible by the microprocessor and puter storage have multiplied the uses of the modern typewriter.　　?！　?3. 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(duì)缺乏彈性的，被稱(chēng)為韌帶的結(jié)蒂組連在一起?！　?4. 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.　　，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.　　，但人類(lèi)還是能夠依其聲音上的線索很快識(shí)別它們。　　66. Not only can walking fish live out of water, but they can also travel short distances over land.　　，還可以在岸上短距離移動(dòng)?！　?7. Scientists do not know why dinosaurs became extinct, but some theories postulate that changers in geography, cl