72. Often very annoying weeds, goldenrods crowd out less hardy plants and act as hosts to many insect pests.
73. Starting around 7000 B.C., and for the next four thousand years, much of the Northern Hemisphere experienced temperatures warmer than at present.
74. When Henry Ford first sought financial backing for making cars, the very notion of farmers and clerks owning automobiles was considered ridiculous.
75. Though once quite large, the population of the bald eagle across North America has drastically declined in the past forty years.
76. The beaver chews down trees to get food and material with which to build its home.
77. Poodles were once used as retrievers in duck hunting, but the American Kennel Club does not consider them sporting dogs because they are now primarily kept as pets.
78. As a result of what is now know in physics and chemistry, scientists have been able to make important discoveries in biology and medicine.
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.
80. Since the consumer considers the best fruit to be that which is the most attractive, the grower must provide products that satisfy the discerning eye.
81. Television the most pervasive and persuasive of modern technologies, marked by rapid change and growth, is moving into a new era, an era of extraordinary sophistication and versatility, which promises to reshape our lives and our world.
82. Television is more than just an electronics; it is a means of expression, as well as a vehicle for communication, and as such becomes a powerful tool for reaching other human beings.
83. Even more shocking is the fact that the number and rate of imprisonment have more than doubled over the past twenty years, and recidivism------that is the rate for re-arrest------is more than 60 percent.
84. His teaching began at the Massachusetts Institute of Technology, but William Rainey Harper lured him to the new university of Chicago, where he remained officially for exactly a generation and where his students in advanced composition found him terrifyingly frigid in the classroom but sympathetic and understanding in their personal conferences.
85. The sloth pays such little attention to its personal hygiene that green algae grow on its coarse hair and communities of a parasitic moth live in the depths of its coat producing caterpillars which graze on its mouldy hair. Its muscles are such that it is quits incapable of moving at a speed of over a kilometer an hour even over the shortest distances and the swiftest movement it can make is a sweep of its hooked arm.
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.
87. Three years of research at an abandoned coal mine in Argonne, Illinois, have resulted in findings that scientists believe can help reclaim thousands of mine disposal sites that scar the coal-rich regions of the United States.
88. When the persuading and the planning for the western railroads had finally been completed, the really challenging task remained: the dangerous, sweaty, backbreaking, brawling business of actually building the lines.
89. Because of the space crunch, the Art Museum has become increasingly cautious in considering acquisitions and donations of art, in some cases passing up opportunities to strengthen is collections.
90. The United States Constitution requires that President be a natural-born citizen, thirty-five years of age or older, who has lived in the United States for a minimum of fourteen years.
91. Arid regions in the southwestern United States have become increasingly inviting playgrounds for the growing number of recreation seekers who own vehicles such as motorcycles or powered trail bikes and indulge in hill-climbing contests or in caving new trails in the desert.
92. Stone does decay, and so tools of long ago have remained when even the bones of the man who made them have disappeared without trace.
93. Insects would make it impossible for us to live in the world; they would devour all our crops and kill our flocks and herds, if it were not for the protection we get from insect-eating animals.
94. It is true that during their explorations they often faced difficulties and dangers of the most perilous nature, equipped in a manner which would make a modern climber shudder at the thought, but they did not go out of their way to court such excitement.
95. There is only one difference between an old man and a young one: the young man has a glorious future before him and old one has a splendid future behind him: and maybe that is where the rub is.
96. I find young people exciting. They have an air of freedom, and they have not a dreary commitment to mean ambitions or love comfort. They are not anxious social climbers, and they have no devotion to material things.
97. I am always amazed when I hear people saying that sport creates goodwill between the nations, and that if only the common peoples of the world could meet one another at football or cricket, they would have no inclination to meet on the battlefield.
98. It is impossible to say simply for the fun and exercise: as soon as the question of prestige arises, as soon as you feel that you and some larger unit will be disgraced if you lose, the most savage combative instincts are around.
99. It has been found that certain bats emit squeaks and by receiving the echoes, they can locate and steer clear of obstacles------or locate flying insects on which they feed. This echo-location in bats is often compared with radar, the principle of which is similar.
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.
13.理論在本質(zhì)上是對認(rèn)識了的現(xiàn)實(shí)的一種抽象和符號化的表達(dá)。
14.兒童在能說或能聽懂語言之前,很久就會通過面部表情和靠發(fā)出噪聲來與人交流了。
15.受當(dāng)代灌溉(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。
16.機(jī)械計(jì)時(shí)器的發(fā)展促使人們尋求更精確的日晷,以便校準(zhǔn)機(jī)械計(jì)時(shí)器。
17.人類學(xué)是一門科學(xué),因?yàn)槿祟悓W(xué)家采用一整套強(qiáng)有力的方法和技術(shù)來記錄觀測結(jié)果,而這樣記錄下來的觀測結(jié)果是供他人核查的。
18.真菌在腐化過程中十分重要,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。
19.音叉被敲擊時(shí),產(chǎn)生幾乎純質(zhì)的音調(diào),其音量經(jīng)久不衰。
20.雖然美洲山河桃樹最集中于美國的東南部但是在北至俄亥俄州及伊利諾州也能看見它們。
21.用怪罪別人的辦法來解決問題通常被稱為尋找替罪羊。
22.一個(gè)國家的主要食物是什么,大體取決于什么作物在其天氣和土壤條件下生長得最好。
23.在大量的實(shí)驗(yàn)中,某一事件發(fā)生的幾率等于它不發(fā)生的幾率。
24.大多數(shù)物質(zhì)遇冷收縮,所以他們的密度在固態(tài)時(shí)高于液態(tài)。
25.大腦細(xì)胞儲存記憶的機(jī)理并不為人明白。
26.到了二十一世紀(jì)中葉,美國畫家和雕塑家開始在世界范圍內(nèi)對藝術(shù)產(chǎn)生重大影響。
27.伊麗莎白市,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。
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。
29. Alexander Graham Bell曾告訴家人,他更愿意讓后人記住他是聾子的老師,而非電話的發(fā)明者。
30.采摘下的迷迭香樹葉常綠不衰,因此人們把迷迭香樹與懷念聯(lián)系在一起。
31.骨頭看起來是脆硬的,但它也有一定的彈性,使得骨骼能夠承受相當(dāng)?shù)拇驌簟?
32.科學(xué)家曾相信:氙氣是不能形成化合物的。
33.對風(fēng)暴動(dòng)力學(xué)的研究是為了提高風(fēng)暴預(yù)測從而減少損失,避免人員傷亡。
34.消除通貨膨脹應(yīng)確保還貸的錢應(yīng)與所貸款的價(jià)值相同。
35.未來主義,二十世紀(jì)早期的一個(gè)藝術(shù)思潮。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。
36. Everglades是美國境內(nèi)最為荒涼和人跡罕至的地區(qū)之一,此處有大量的野生動(dòng)植物而且大多受(法律)保護(hù)。
37. Lucretia Mott’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。
38.國際市場研究者的活動(dòng)范圍常常較國內(nèi)市場研究者廣闊。
39.大陸分水嶺是指北美洛磯山脈上的一道想象線,該線把大西洋流域和太平洋流域區(qū)分開來。
40.對地球引力的研究表明,在不尋常的負(fù)荷之下地殼和地幔會發(fā)生位移。
41.尤它州制造業(yè)的年產(chǎn)值大于其工業(yè)和農(nóng)業(yè)的總和。
42.墻花之所以叫墻花,是因?yàn)槠浯嗳醯闹Ω山?jīng)常要靠墻壁或順石崖生長,以便有所依附。
43.社會心理學(xué)的主要焦點(diǎn)是人與人之間的交往,而不是他們各自生活中的事件。
44.給美國的新移民增加教育設(shè)施比任何社會運(yùn)動(dòng)都更多的激發(fā)了Elizabeth Williams的熱情。
45.典型的鵪鶉都長有短而圓的翅膀,憑此他們可以在受驚時(shí)一躍而起,飛離它們的躲藏地。
46.根據(jù)人類學(xué)家的說法,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.直到1866年第一條橫跨大西洋的電纜才完全成功的架通。
48. John Crowe Ransom在他的著作中描述了他認(rèn)為是由科學(xué)技術(shù)給社會帶來的精神貧困。
49.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.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。
51.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.無政府主義這個(gè)詞描述的是一堆理論和態(tài)度,它們的主要共同點(diǎn)在于相信政府是有害的,沒有必要的。
53.恐怕沒有誰對大多數(shù)美國人的日常生活影響能超過汽車生產(chǎn)的先驅(qū)亨利.福特。
54.使用精心挑選的無意義詞匯,可以檢驗(yàn)語言學(xué)科里許多基本的假定。
55.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.相互般配的珍珠,串成一條項(xiàng)鏈,就能賣到比單獨(dú)售出好得多的價(jià)錢。
57.十八世紀(jì)時(shí),“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.在竹子的近七百個(gè)品種中,有的全長成還不到一英尺,有的卻能在二十四小時(shí)內(nèi)長出三英尺。
59.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.在所有的經(jīng)濟(jì)作物中,棕櫚樹得到的研究最少。
61.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?yàn)榧夹g(shù)能夠并且已經(jīng)影響著營銷活動(dòng)。
62.電腦儲存和由于電子微處理機(jī)得以實(shí)現(xiàn)的電控運(yùn)用成倍的增加了現(xiàn)代打字機(jī)的功能。
63.人類骨骼有二百多塊骨頭組成,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。
64.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.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.鲇魚不僅可以離開水存活,還可以在岸上短距離移動(dòng)。
67.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.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.雪對農(nóng)民是一種幫助,因?yàn)樗3值貙油寥赖臏囟,使種子不致凍死。
70.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。
北京 | 天津 | 上海 | 江蘇 | 山東 |
安徽 | 浙江 | 江西 | 福建 | 深圳 |
廣東 | 河北 | 湖南 | 廣西 | 河南 |
海南 | 湖北 | 四川 | 重慶 | 云南 |
貴州 | 西藏 | 新疆 | 陜西 | 山西 |
寧夏 | 甘肅 | 青海 | 遼寧 | 吉林 |
黑龍江 | 內(nèi)蒙古 |