最后一句是非常震撼的。作者的雄辩提醒各位，时刻从全方位思考每一个问题，也就是说，每一样新事物的出现和产生，必然附带一些不利的因素，也是就类似新概念里的“The progress of knowledge”所提到的two-edged weapon 效应。

In sum, the speaker's assertion that we should invest in research whose results are "controversial" begs the question, because we cannot know whether research will turn out controversial until we've invested in it. As for the speaker's broader assertion, I agree that money spent on research is generally a sound investment because it is an investment in the advancement of human knowledge and in human imagination and spirit. Nevertheless, when we do research purely for its own sake without aim or clear purpose——we risk squandering resources which could have been applied to relieve the immediate suffering of our dispirited, disadvantaged, and disenfranchised members of society. In the final analysis, given finite economic resources we are forced to strike a balance in how we allocate those resources among competing societal objectives.

最后一段作者等于是把每一段的中心进行有效的浓缩归集。

这篇文章大部分从反面的角度反驳了原文观点，不仅语言运用得体，而且灵活运用复杂句，是难得的好文章。如果ets心情好，忽略一些语法错误（我已更正）的话，6分应该不成问题的。