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 seri
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
91. The tumultuous Cultural Revolution was chiefly responsible for the searing desire for change in China.混乱的文化大革命是引起对中国发生变化的极度渴望的主要原因。92. Tra
101. Effluent discharges of industrial wastewater and raw sewage into rivers , lakes and inshore coastal areas have not only adversely affected marine life and aquatic resources , but have also jeopar
121. A question begging an answer centers on whether violence is more directly related to the innate characteristic of human being, or whether it is simply a manifestation of the ills of society. Dete
131. Large and small enterprises differ in that the former usually involves conglomerates and the latter private individuals.大企业和小企业的区别在于前者通常涉及联合大企业，
141. While the inclination to procrastinate is common, one must fully consider the detrimental impact of unnecessary delays.虽然拖延的倾向是普遍的，但是人们应该充分考虑到不必
181. Chances are that man will eventually land on Mars.人类有可能最终登陆火星。182. The likelihood for peace in the Middle East remains questionable.中东和平的可能性仍让人怀
191. The plain truth is that people are most often self-centered.明显的事实是人经常是以自我为中心的。192. There's little wonder why young people often find it difficult to find an ap
201. It doesn't follow that one should abandon a workable plan simply because of minor setbacks. So doing would quite frankly be foolish.一个人不能因为几个小挫折就放弃一个可行的