第一种：直接陈述观点+概述理由 I agree with the speaker's broad assertion that money spent on research is generally well invested。 However, the speaker unnecessarily extends this broad assertion to embrace research whose results are "controversial," while ignoring certain compelling reasons why some types of research might be unjustifiable。
My points of contention with the speaker involve the fundamental objectives and nature of research, as discussed below。 例文中先支持原文观点：把钱话在研究上是很好的投资;然后转折：结果有争议的研究可以不包含在投资范围的;最后，引出下文要论述的理由。
第二种：比较双方观点，阐明自己观点 There is much debate over the universal issues whether or not tradition and modernization are incompatible。
Some people may claim that they necessarily conflict with each other, while others argue that the two are not mutually exclusive。
Insofar as I can think, the best way is to coordinate them and exert their own advantages for contemporary society。 第一句改写题目，第二句比较两种立场，第三句提出自己的观点。
这种开头比较简单易学，也是同学们比较常用的开头方式，需要注意的是在点明自己的观点的时候，最好把下文中要进行分层论证的关键词结合到句子里面，比如上述例子中的coordinate ;exert their own advantages，可以起到引领下文，令文章结构严谨的作用。
第三种：背景开头+立场 Explosive development of science and technology has been made during the past one hundred years or so。
When it comes to progress of the condition of humanity all over the world, there are always a host of different opinions held by different individuals from different areas。
Have, you may wonder, the technology developments or innovations contributed to promoting our humanity? Admittedly, most people would consider that there are still so many troubles with us such as poverty, violence, conflicts and even wars。
However, as a whole effect in general, technology progress has in fact, tend to lead to a significant promotion of the overall condition of humanity in the world。
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