21. Eliminating problems by transferring the blame to others is often called scape-goating. 用怪罪別人的辦法來解決問題通常被稱為尋找替罪羊。

　　22. The chief foods eaten in any country depend largely on what grows best in its climate and soil. 一個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. Over a very large number of trials，the probability of an event's occurring is equal to the probability that it will not occur. 在大量的實驗中，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 the density of its liquid. 大多數(shù)物質(zhì)遇冷收縮，所以他們的密度在固態(tài)時高于液態(tài)。

　　25. The mechanism by which brain cells store memories is not clearly understood. 大腦細(xì)胞儲存記憶的機(jī)理并不為人明白。

　　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. 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. In the eastern part of New Jersey lies the city of Elizabeth，a major shipping and manufacturing center. 伊麗莎白市，一個重要的航運和制造業(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 completely female medical staff. Elizabeth Blackwell，美國第一個女醫(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. 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. 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。

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