71. Identifying the reasons for an emerging phenomenon which involves several complicated factors is far from an easy task . For example , some scientists attribute environmental deterioration to a series of natural factors , while others place the blame solely on inappropriate human behavior .

　　要找到涉及許多復雜因素的新現象的原因遠非一件易事。例如，一些科學家把環境的惡化歸結為一些自然因素，而另一些人把責任都推在人類不適當的行為上。

　　72. One doesn’t have to look far to realize the direct correlation between smoking and cancer .

　　人們不用花費很大力氣就能發現抽煙和癌癥之間的直接聯系。

　　73. The explanation for the phenomenon of the rising teenage suicide rate involves many complicated factors . Some attribute the rise to an overemphasis on early success , others point to mounting peer pressure , and still others to confusion over changing social values .

　　對上升的少年自殺率的解釋涉及很多復雜的因素。有的人把上升的原因歸結為過分強調少年時期的成功，有的人指出是因為不斷增長的同伴之間的壓力，還有人認為是對不斷變化的社會價值的迷茫造成的。

　　74. The reasons for antisocial behavior are both complicated and varied . I suggest the phenomenon results from inappropriate role models and the lack of well-defined norms of behavior . However , the main reason is quite likely the continuing degeneration of social values .

　　反社會行為的原因既復雜又多樣。我認為這種現象是不恰當的角色典型和缺少行為規范的很好的定義造成的。然而，主要原因很可能是不斷貶低的社會價值。

　　75. The causes of racial hatred are not readily definable . Sociologists , however , attribute them to the misguided concept of a superior race and an innate mistrust of people of color . Perhaps the main cause is quite simply ignorance .

　　種族仇恨的起因沒有現成的答案。然而，社會學家把原因歸結為被誤導的更高貴的種族的觀念以及天生的對有色人種的不信任。主要原因可能僅僅是因為無知。

　　76. The scourge of HIV/AIDS currently engulfing the world will quite likely be brought under control within the next few years thanks to the untiring efforts of scientists and researchers worldwide .

　　現在席卷世界的艾滋病的禍害很有可能由于全世界科學家和研究人員的不懈努力在未來幾年內得到控制。

　　77. The incidence rate of cancer mainly stems from several factors , including inappropriate diets , poor healthcare practices and the lack of early detection . Continuing medical advances and rising awareness do , however , offer promising hope for the future .

　　癌癥的發病率主要由以下諸多因素引起，包括不適當的飲食、不好的保健習慣以及沒有及早發現。然而，醫學的不斷進步和對此不斷增強的關注給未來帶來了很大的希望。

　　78. Increased urban pollution levels and the mounting death toll from motor vehicles accidents can mainly be attributed to the glut of automobiles appearing on city roads in recent years . Detrimental factors will quite likely outweigh the benefits of rising automobile usage .

　　城市人口的增長和車禍中死亡率的增加主要是由于近年內充斥城市道路的汽車。汽車使用量的增加帶來的有害因素很有可能超過它的好處。

　　79. The rising divorce rate in China can , at least in part , be attributed to spousal incompatibility , disparities in education levels , changing social attitudes and the increasing upward mobility of the younger generation .

　　中國上升的離婚率可以，至少部分可以歸結為婚姻的不和諧，受教育水平的差異，變化的社會看法以及年輕一代不斷增強的上進心。

　　80. State-owned enterprises are not only failing because of inefficient management , but also because of their inability to awitch operational modes from the former planned economy to the new market economy .

　　國有企業失敗不僅由于低效的管理，也因為他們不能實現從以前的計劃經濟到新的市場經濟的運作模式的轉換。

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