20.  Although pecans are most plentiful in the southeastern part of the United States, they are found as far north as Ohio and Illinois.

21.   Eliminating problems by transferring the blame to others is often called scapegoating.

22.  The chief foods eaten in any country depend largely on what grows best in its climate and soil.

23.  Over a very large number of trials, the probability of an event’s occurring is equal to the probability that it will not occur.

24.  Most substance contract when they freeze so that the density of a substance’s solid is higher than the density of its liquid.

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.

27.  In the eastern part of New Jersey lies the city of Elizabeth, a major shipping and manufacturing center.

28.  Elizabeth Blackwell, the first woman medical doctor in the United States, founded the New York Infirmary, an institution that has always had a completely female medical staff.

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.  采摘下的迷迭香（rosemary）树叶常绿不衰，因此人们把迷迭香树与怀念（remembrance）联系在一起。

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.  科学家曾相信：氙气（xenon）是不能形成化合物的。（还是注意“无灵主语”的问题）

33.  对风暴动力学（dynamics）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.  消除通货膨胀应确保还贷的钱应与所贷款的价值相同。

35.  未来主义（Futurism）是二十世纪早期的一个艺术思潮。它拒绝一切传统，试图通过强调机械和动态来美化生活。（翻译成一句话：将某些成分处理成“同位语”）

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。（掌握这种下定义的句子结构，新概念3/4课文中这种句子也极为多见，是写作一定要会用的句子。这种句子的特点就是使用定语从句，但并非定语作用，而是进一步说明和描述。这是定语从句的一种特殊、重要的使用方法）

37.  Lucretia Mott’s的影响巨大，所以一些权威部门（authorities）认定她为美国女权运动（feminism）的创始人（originator）。

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.  大陆分水岭是指北美洛矶山脉（North American Rockies）上的一道想象线（imaginary line），该线把大西洋流域（waters）和太平洋流域区分开来。

40.  对地球引力（gravity field）的研究表明，在不寻常的负荷之下地壳（crust）和地幔（mantle）会发生位移（yield）。

41.  犹他州（Utah）制造业（manufacturing）的年产值（annual worth）大于其采矿业（mining）和农业（farming）的总和。

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.

30.  Because its leaves remain green long after being picked, rosemary became associated with the idea of remembrance.