【正文】 ures warmer than at ，在四千年當(dāng)中，北半球的溫度比現(xiàn)在高。 in prehistoric times created paints by grinding materials such as plants and clay into power and then adding ，然后加水。 aids farmers by keeping heart in the lower ground levels, thereby saving the seeds from ，因?yàn)樗３值貙油寥赖臏囟?，使種子不致凍死。 do not know why dinosaurs became extinct, but some theories postulate that changers in geography, climate, and sea levels were ，但是一些理論推斷是地理，氣候和海平面的變化造成的。 mockingbirds superbly mimic the songs and calls of many birds, they can nonetheless be quickly identified as 愛思英語(yǔ)學(xué)習(xí)網(wǎng)愛思英語(yǔ)mockingbirds by certain aural ，但人類還是能夠依其聲音上的線索很快識(shí)別它們。 human skeleton consists of more than two hundred bones bound together by tough and relatively inelastic connective tissues called ，住些骨頭石油堅(jiān)韌而相對(duì)缺乏彈性的，被稱為韌帶的結(jié)蒂組連在一起。 and sellers should be aware of new developments in technology can and does affect marketing ，原因很簡(jiǎn)單，因?yàn)榧夹g(shù)能夠并且已經(jīng)影響著營(yíng)銷活動(dòng)。 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 ，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。 the eighteenth century, Little Turtle was chief of the Miami tribe whose territory became what is now Indiana and ，“小烏龜”是邁阿密部落的酋長(zhǎng)，該部落的地盤就是今天的印第安那州和俄亥俄州。 history of painting is a fascinating chain of events that probably began with the very first pictures ever ，其源頭大概可以上溯到最早的圖畫。 no man had more effect on the daily lives of most people in the Untied States than did Henry Ford a pioneer in automobile 。 many symbols makes it possible to put a large amount of inFORMation on a single 。 with parents whose guidance is firm, consistent, and rational are inclined to possess high levels of ，始終如一和理性，孩子就有可能充滿自信。 until 1866 was the fully successful transatlantic cable finally 。 typically have short rounded wings that enable them to spring into full flight instantly when disturbed in their hiding ，憑此他們可以在受驚時(shí)一躍而起，飛離它們的躲藏地。 social crusade aroused Elizabeth Williams39。 wallflower is so called because its weak stems often grow on walls and along stony cliffs for ，是因?yàn)槠浯嗳醯闹Ω山?jīng)常要靠墻壁或順石崖生長(zhǎng)，以便有所依附。 annual worth of Utah39。 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 ，該線把大西洋流域和太平洋流域區(qū)分開來(lái)。s的影響巨大，所以一些權(quán)威部門認(rèn)定她為美國(guó)女權(quán)運(yùn)動(dòng)的創(chuàng)始人。 Mott39。拒絕一切傳統(tǒng)，試圖通過(guò)強(qiáng)調(diào)機(jī)械和動(dòng)態(tài)來(lái)美化生活。愛思英語(yǔ)學(xué)習(xí)網(wǎng)愛思英語(yǔ) elimination of inflation would ensure that the amount of money used in repaying a loan would have the same value as the amount of money 。 xenon could not FORM chemical pounds was once believed by ：氙氣是不能形成化合物的。 its leaves remain green long after being picked, rosemary became associated with the idea of ，因此人們把迷迭香樹與懷念聯(lián)系在一起。 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 Blackwell，美國(guó)第一個(gè)女醫(yī)生，創(chuàng)建了員工一直為女性紐約診所。 the middle of the twentieth century, painters and sculptors in the United States had begun to exert a great worldwide influence over ，美國(guó)畫家和雕塑家開始在世界范圍內(nèi)對(duì)藝術(shù)產(chǎn)生重大影響。s solid is higher than the density of its ，所以他們的密度在固態(tài)時(shí)高于液態(tài)。s occurring is equal to the probability that it will not ，某一事件發(fā)生的幾率等于它不發(fā)生的幾率。 chief foods eaten in any country depend largely on what grows best in its climate and ，大體取決于什么作物在其天氣和土壤條件下生長(zhǎng)得最好。 pecans are most plentiful in the southeastern part of the United States, they are found as far north as Ohio and 。 are important in the process of decay, which returns ingredients to the soil, enhances soil fertility, and deposes animal ，而腐化過(guò)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。 development of mechanical timepieces spurred the search for more accurate sundials with which to regulate ，以便校準(zhǔn)機(jī)械計(jì)時(shí)器。 before children are able to speak or understand a language, they municate through facial expressions and by making ，很久就會(huì)通過(guò)面部表情和靠發(fā)出噪聲來(lái)與人交流了。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。 Holiday39。 knee is the joints where the thigh bone meets the large bone of the lower 。 modern offices being more mechanized, designers are attempting to personalize them with warmer, less severe ，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(lái)使其具有親切感。 is more difficult to write simply, directly, and effectively than to employ flowery but vague expressions that only obscure one39。 group to remain in existence, a profitmaking organization must, in the long run, produce something consumers consider useful or ，最終都必須生產(chǎn)出消費(fèi)者可用或需要的產(chǎn)品。s et in 1986, how many people will live long enough to see it return in the twentyfirst ，有多少人能夠長(zhǎng)壽到足以目睹它在二十一世紀(jì)的回歸呢？ have discovered that fear, happiness, sadness, and surprise are universally reflected in facial ，恐懼，快樂，悲傷和驚奇都會(huì)行之于色，這在全人類是共通的。第一篇：俞敏洪經(jīng)典英語(yǔ)100句100句背7000單詞俞敏洪的超強(qiáng)英語(yǔ)6級(jí)100句 of the grassland dwellers of the continent is the American antelope, or ，或稱叉角羚，是該大陸典型的草原動(dòng)物。 the millions who saw Haley39。 of its irritating effect on humans, the use of phenol as a general antiseptic has been largely ，它基本上已不再被當(dāng)作常用的防腐劑了。 greater the population there is in a locality, the greater the need there is for water, transportation, and disposal of ，其對(duì)水，交通和垃圾處理的需求就會(huì)越大。s ，直接，有力的寫作難于花哨，含混而意義模糊的表達(dá)。 difference between libel and slander is that libel is printed while slander is ，而后者是口頭的。 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 ，它在溶于水時(shí)具有強(qiáng)烈的氣味和對(duì)金屬的腐蝕性，并且能夠使某些藍(lán)色植物染料變紅。s reputation as a great jazzblues singer rests on her ability to give emotional depth to her Holiday39。, a theory is an abstract, symbolic representation of what is conceived to be 。 to modern irrigation, crops now grow abundantly in areas where once nothing but cacti and sagebrush could (技術(shù)設(shè)施)之賜，農(nóng)作物在原來(lái)只有仙人掌和蕎屬科植物才能生存的地方旺盛的生長(zhǎng)。 is a science in that anthropologists use a rigorous set of methods and techniques to document observations 愛思英語(yǔ)學(xué)習(xí)網(wǎng)愛思英語(yǔ)that can be checked by ，因?yàn)槿祟悓W(xué)家采用一整套強(qiáng)有力的方法和技術(shù)來(lái)記錄觀測(cè)結(jié)果，而這樣記錄下來(lái)的觀測(cè)結(jié)果是供他人核查的。 it is struck, a tuning fork produces an almost pure t