17.there has been a dramatic increase in the spread of hiv/aids in recent years , with a new study projecting that the dreaded disease will affect over 30 million people worldwide by the year 2005 .

　　近年来，艾滋病蔓延的幅度进一步扩大，一项新的研究预测，到2005年，世界上有超过三千万人将感染这一可怕的疾病。

　　18.working with the disabled cannot help but leave one impressed with their indefatigable desire .

　　与残疾人一起工作使一个人不得不对他们坚持不懈的渴望印象深刻。

　　19.perhaps no issues are more controversial than euthanasia and abortion , both of which involve taking the life of a human being .

　　也许没有问题比安乐死和人工流产更有争议性，它们都涉及结束一个人的生命。

　　20.never before in history has the issue of overpopulation been more evident than now .

　　历史上，人口过剩的问题从来没有比现在更加突出。

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