解題：讀此段時，考生會發(fā)現(xiàn)在第二句出現(xiàn)however一詞，這種情況下，第一句的內(nèi)容即可以忽略，考生應(yīng)該直接讀第二句及其后面的內(nèi)容。運用無詞閱讀法，第二句大意為“人口和工作密度實際上是增長或保持不變的”；第三句話解釋說明出現(xiàn)這種情況的原因是把相關(guān)領(lǐng)域工作的人放在一起是非常有價值的；第四句話又引用一句話來進一步解釋說明。因此我們根據(jù)轉(zhuǎn)折厚的內(nèi)容選出此段大意為? iii The benefits of working together in cities。而陷阱為vi The impact of telecommunications on population distribution。

☆ 附加新的信息，即信息之間為并列關(guān)系，如劍1，Test 4，passage 1中的B段（這種情況下，考生需要找信息之間的共同點，段落大意根據(jù)共同點得出）

On the horizon are optical computers. These could store programs and process information by means of light—pulses from tiny lasers—rather than electrons. And the pulses would travel over glass fibers, not copper wire. These machines could function hundreds of times faster than today’s electronic computers and hold vastly more information. Today fiber optics are used to obtain a cleaner image of smaller and smaller objects than ever before—even bacterial viruses. A new generation of optical instruments is emerging that can provide detailed imaging of the inner workings of cells. It is the surge in fiber optic use and in liquid crystal displays that has set the U.S. glass industry (a 16 billion dollar business employing some 150,000 workers) to building new plants to meet demand.

解題：考生在運用“無詞閱讀法”略讀此段的過程中會發(fā)現(xiàn)第一、二、三和第四句都是關(guān)于optical computers的；第五句內(nèi)容是關(guān)于fiber optics的；第六句是關(guān)于optical instruments的；第七句是關(guān)于fiber optic use and in liquid crystal displays的。顯然段落中在不斷附加新的信息，尋找信息之間的共同點，我們會發(fā)現(xiàn)信息都是和optic有關(guān)的，因此答案為viii Exiting innovations in fiber optics,而陷阱為ii Computers and their dependence on glass。

☆ 最后一、二句歸納總結(jié)前文，如劍6，Test 4，passage 1中的C段（這種情況下，考生根據(jù)最后一、二句話歸納段落大意即可）

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?

解題：運用無詞閱讀法，略讀該段，考生會發(fā)現(xiàn)段落的第三句后半部分和第四句，作者用邏輯詞so，并采用問句的形式引出結(jié)論：so are doctors to blame for the escalating extravagance of pharmaceutical marketing? Or is it the industry’s responsibility to decide the boundaries? 我們在歸納該段的段落大意時，就應(yīng)該根據(jù)第三句so后面的內(nèi)容來歸納，所以答案選Who is responsible for the increase in promotion?

考生們需要注意，在雅思考試中，以第三種邏輯關(guān)系最為常見，而第四種出現(xiàn)頻率最小。