25. The mechanism by which brain cells store memories is not clearly understood.
25.大脑细胞储存记忆的机理并不为人明白。

26. By the middle of the twentieth century, painters and sculptors in the Unit
ed States had begun to exert a great worldwide influence over art.
26.到了二十一世纪中叶，美国画家和雕塑家开始在世界范围内对艺术产生重大影响。

27. In the eastern part of New Jersey lies the city of Elizabeth, a major ship
ping and manufacturing center.
27.伊丽莎白市，一个重要的航运和制造业中心，坐落于新泽西州的东部。

28. Elizabeth Blackwell, the first woman medical doctor in the United States,
founded the New York Infirmary, an institution that has always had a completel
y female medical staff.
28. Elizabeth Blackwell，美国第一个女医生，创建了员工一直为女性纽约诊所。

29. Alexander Graham Bell once told his family that he would rather be remembe
red as a teacher of the deaf than as the inventor of the telephone.
29. Alexander Graham Bell曾告诉家人，他更愿意让后人记住他是聋子的老师，而非电话
的发明者。

30. Because its leaves remain green long after being picked, rosemary became a
ssociated with the idea of remembrance.
30.采摘下的迷迭香树叶常绿不衰，因此人们把迷迭香树与怀念联系在一起。

31. Although apparently rigid, bones exhibit a degree of elasticity that enabl
es the skeleton to withstand considerable impact.
31.骨头看起来是脆硬的，但它也有一定的弹性，使得骨骼能够承受相当的打击。

32. That xenon could not FORM chemical compounds was once believed by scientists.
32.科学家曾相信：氙气是不能形成化合物的。

33. Research into the dynamics of storms is directed toward improving the abil
ity to predict these events and thus to minimize damage and avoid loss of life.

33.对风暴动力学的研究是为了提高风暴预测从而减少损失，避免人员伤亡。

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.
34.消除通货膨胀应确保还贷的钱应与所贷款的价值相同。

35. Futurism, an early twentieth-century movement in art, rejected all traditi
ons and attempted to glorify contemporary life by emphasizing the machine and
motion.
35.未来主义，二十世纪早期的一个艺术思潮。拒绝一切传统，试图通过强调机械和动态来
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是美国境内最为荒凉和人迹罕至的地区之一，此处有大量的野生动植物而
且大多受(法律)保护。

37. Lucretia Mott’s influence was so significant that she has been credited b
y some authorities as the originator of feminism in the United States.
37. Lucretia Mott’s的影响巨大，所以一些权威部门认定她为美国女权运动的创始人。

38. The activities of the international marketing researcher are frequently mu
ch broader than those of the domestic marketer.
38.国际市场研究者的活动范围常常较国内市场研究者广阔。

39. The continental divide refers to an imaginary line in the North American R
ockies that divides the waters flowing into the Atlantic Ocean from those flow
ing into the Pacific.
39.大陆分水岭是指北美洛矶山脉上的一道想象线，该线把大西洋流域和太平洋流域区分开
来。

40. Studies of the gravity field of the Earth indicate that its crust and mant
le yield when unusual weight is placed on them.
40.对地球引力的研究表明，在不寻常的负荷之下地壳和地幔会发生位移。

41. The annual worth of Utah’s manufacturing is greater than that of its mini
ng and farming combined.
41.尤它州制造业的年产值大于其工业和农业的总和。

42. The wallflower is so called because its weak stems often grow on walls and
 along stony cliffs for support.
42.墙花之所以叫墙花，是因为其脆弱的枝干经常要靠墙壁或顺石崖生长，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.
43.社会心理学的主要焦点是人与人之间的交往，而不是他们各自生活中的事件。

44. No social crusade aroused Elizabeth Williams’ enthusiasm more than the ex
pansion of educational facilities for immigrants to the United States.
44.给美国的新移民增加教育设施比任何社会运动都更多的激发了Elizabeth Williams的热
情。

45. Quails typically have short rounded wings that enable them to spring into
full flight instantly when disturbed in their hiding places.
45.典型的鹌鹑都长有短而圆的翅膀，凭此他们可以在受惊时一跃而起，飞离它们的躲藏地。

46. According to anthropologists, the earliest ancestors of humans that stood
upright resembled chimpanzees facially, with sloping foreheads and protruding
brows.
46.根据人类学家的说法，直立行走的人的鼻祖面部轮廓与黑猩猩相似，额头后倾，眉毛突出。