解题：考生在运用“无词阅读法”略读此段的过程中会发现第一、二、三和第四句都是关于optical computers的;第五句内容是关于fiber optics的;第六句是关于optical instruments的;第七句是关于fiber optic use and in liquid crystal displays的。显然段落中在不断附加新的信息，寻找信息之间的共同点，我们会发现信息都是和optic有关的，因此答案为viii Exiting innovations in fiber optics,而陷阱为ii Computers and their dependence on glass。

最后一、二句归纳总结前文，如剑6，Test 4，passage 1中的C段(这种情况下，考生根据最后一、二句话归纳段落大意即可)

Selling pharmaceuticals is a daily exercise in ethical judgment. Salespeople like Schaefer walk the line between the common practice of buying a prospect’s time with a free meal, and bribing doctors to prescribe their drugs. They work in an industry highly criticized for its sales and marketing practices, but find themselves in the middle of the age-old chicken-or-egg question – business won’t use strategies that don’t work, so are doctors to blame for the escalating extravagance of pharmaceutical marketing? Or is it the industry’s responsibility to decide the boundaries?

解题：运用无词阅读法，略读该段，考生会发现段落的第三句后半部分和第四句，作者用逻辑词so，并采用问句的形式引出结论：so are doctors to blame for the escalating extravagance of pharmaceutical marketing? Or is it the industry’s responsibility to decide the boundaries? 我们在归纳该段的段落大意时，就应该根据第三句so后面的内容来归纳，所以答案选Who is responsible for the increase in promotion?

考生们需要注意，在雅思考试中，以第三种逻辑关系最为常见，而第四种出现频率最小。