雅思阅读，怎么才能有效发现信号词？

考点：First mechanism， then mass use of chemical fertiliser and pesticides， then monocultures， then battery rearing of livestock， and now genetic engineering – the onward marching of intensive farming ha...

考点：First mechanism， then mass use of chemical fertiliser and pesticides， then monocultures， then battery rearing of livestock， and now genetic engineering – the onward marching of intensive farming has seemed unstoppable in the last hal- century， as the yields of produce have soared. (C7， P44， Q15)
解析：段首句连用表示次序的信号词，first， then， then… and now， 体现发展的不同阶段。(the stages of development of farming industry C7 P77 选择配对)
以上只是粗略概括了信号词对于雅思阅读过程中的作用，具体应用还需要考生多加练习和揣摩，找出适合自己的阅读方法。希望这些内容能给大家带来帮助。