【正文】 d 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。62. The application of electronic controls made possible by the microprocessor and puter storage have multiplied the uses of the modern typewriter.。60. Of all the economically important plants, palms have been the least studied.，棕櫚樹(shù)得到的研究最少。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。56. 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，就能賣到比單獨(dú)售出好得多的價(jià)錢。54. 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。51. Using many symbols makes it possible to put a large amount of inFORMation on a single map.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.，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。49. Children with parents whose guidance is firm, consistent, and rational are inclined to possess high levels of selfconfidence.，始終如一和理性，孩子就有可能充滿自信。47. Not until 1866 was the fully successful transatlantic cable finally laid.。45. Quails typically have short rounded wings that enable them to spring into full flight instantly when disturbed in their hiding places.，憑此他們可以在受驚時(shí)一躍而起，飛離它們的躲藏地。43. It is the interaction between people, rather than the events that occur in their lives, that is the main focus of social psychology.，而不是他們各自生活中的事件。41. The annual worth of Utah’s manufacturing is greater than that of its mining and farming bined.。39. The 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 Pacific.，該線把大西洋流域和太平洋流域區(qū)分開(kāi)來(lái)。37. Lucretia Mott’s influence was so significant that she has been credited by some authorities as the originator of feminism in the United States.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(guó)女權(quán)運(yùn)動(dòng)的創(chuàng)始人。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。34. The 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 borrowed. 。32. That xenon could not FORM chemical pounds was once believed by scientists.：氙氣是不能形成化合物的。30. Because its leaves remain green long after being picked, rosemary became associated with the idea of remembrance.，因此人們把迷迭香樹(shù)與懷念聯(lián)系在一起。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(guó)第一個(gè)女醫(yī)生，創(chuàng)建了員工一直為女性紐約診所。26. By the middle of the twentieth century, painters and sculptors in the United States had begun to exert a great worldwide influence over art.，美國(guó)畫家和雕塑家開(kāi)始在世界范圍內(nèi)對(duì)藝術(shù)產(chǎn)生重大影響。24. Most substance contract when they freeze so that the density of a substance’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(zhǎng)得最好。20. Although pecans are most plentiful in the southeastern part of the United States, they are found as far north as Ohio and Illinois.。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(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。16. The development of mechanical timepieces spurred the search for more accurate sundials with which to regulate them.，以