【正文】 ，某一事件發(fā)生的幾率等于它不發(fā)生的幾率。24. Most substance contract when they freeze so that the density of a substance’s solid is higher than thedensity of its liquid.，所以他們的密度在固態(tài)時(shí)高于液態(tài)。25. The mechanism by which brain cells store memories is not clearly understood. 。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(huà)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。27. In the eastern part of New Jersey lies the city of Elizabeth, a major shipping and manufacturing center. ，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, 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。29. Alexander Graham Bell once told his family that he would rather be remembered as a teacher of the deaf than as the inventor of the telephone.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. 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。31. Although apparently rigid, bones exhibit a degree of elasticity that enables the skeleton to withstand considerable impact.，但它也有一定的彈性，使得骨骼能夠承受相當(dāng)?shù)拇驌簟?2. That xenon could not FORM chemical pounds was once believed byscientists.：氙氣是不能形成化合物的。33. Research into the dynamics of storms is directed toward improving the ability to predict these events and thus to minimize damage and avoid loss of life.，避免人員傷亡。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.。35. Futurism, an early twentiethcentury movement in art, rejected all traditions and attempted to glorify contemporary life by emphasizing the machine and motion.，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(guò)強(qiáng)調(diào)機(jī)械和動(dòng)態(tài)來(lái)美化生活。36. One of the wildest and most inaccessible parts of the United States is the Everglades where wildlife is abundant and largely protected.36. Everglades 是美國(guó)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 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(mén)認(rèn)定她為美國(guó)女權(quán)運(yùn)動(dòng)的創(chuàng)始人。38. The activities of the international marketing researcher are frequently much broader than those of the domestic marketer.。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)。40. Studies of the gravity field of the Earth indicate that its crust and mantle yield when unusual weight is placed on them.，在不尋常的負(fù)荷之下地殼和地幔會(huì)發(fā)生位移。41. The annual worth of Utah’s manufacturing is greater than that of its mining and farming bined.。42. The wallflower is so called because its weak stems often grow on walls and along stony cliffs for support. ，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。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。44. No social crusade aroused Elizabeth Williams’ enthusiasm more than the expansion of educational facilities for immigrants to the United States. Elizabeth Williams 的熱情。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。46. According to anthropologists, the earliest ancestors of humans that stood upright resembled chimpanzees facially, with sloping foreheads and protruding brows.，直立行走的人的鼻祖面部輪