种族仇恨的起因没有现成的答案。然而，社会学家把原因归结为被误导的更高贵的种族的观念以及天生的对有色人种的不信任。主要原因可能仅仅是因为无知。

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.
现在席卷世界的艾滋病的祸害很有可能由于全世界科学家和研究人员的不懈努力在未来几年内得到控制。

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 .
癌症的发病率主要由以下诸多因素引起，包括不适当的饮食、不好的保健习惯以及没有及早发现。然而，医学的不断进步和对此不断增强的关注给未来带来了很大的希望。

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.
城市人口的增长和车祸中死亡率的增加主要是由于近年内充斥城市道路的汽车。汽车使用量的增加带来的有害因素很有可能超过它的好处。

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.
中国上升的离婚率可以，至少部分可以归结为婚姻的不和谐，受教育水平的差异，变化的社会看法以及年轻一代不断增强的上进心。

80. State-owned enterprises are not only failing because of inefficient management, but also because of their inability to a witch operational mode from the former planned economy to the new market economy.
国有企业失败不仅由于低效的管理，也因为他们不能实现从以前的计划经济到新的市场经济的运作模式的转换。

81. Although we do not know the long-term consequences of separation or deprivation, we do know that they can produce acute immediate distress.
虽然我们不知道分离和丧失亲人的长期后果，但我们知道它们能立即引起剧烈的悲痛。

82. One can readily trace the disappearance of dinosaurs to a major cataclysmic event.
人们很容易把恐龙消失的原因归结为重大的灾难性事件。

83. The reasons for poverty are many, but for the most part center on illiteracy, the lack of opportunities and in some cases pure laziness.
贫困的原因很多，但主要是因为缺少教育、缺少机会，有的情况下纯粹是由于懒惰。

84. Child development depends on a number of factors, both physical and psychological. Correct parental nurturing from infancy through adolescence determines both the physical and mental profile of a mature individual.
儿童的发展取决于很多因素，包括生理的和心理的。从婴儿期到青春期的正确的家长教育决定一个成熟的个人的体质及智力的状况。

85. Factors such as self-confidence and ambition, combined with determination and willpower, contribute to eventual success or failure.hxw.red