第二段首句出现了GRE阅读中的标志性转折词however,说明这句话就是新观点:但是,风媒植物所独有的一系列特征可减少花粉浪费。这说明风媒植物除了可以产生大量花粉加以补偿的消极策略之外,还可以通过一些积极机制减少花粉损失,不一定需要产生大量花粉。
GRE阅读文章的第三种常见结构是现象解释型。
文章开始提出一个现象,然后解释现象。解释是主题。有多个解释时,作者一般对前面的解释持负面评价,对最后的解释持正面评价。提出现象时的标志词有:phenomenon, fact; problem, difficulty, puzzle, question等。例如,
What causes a helix in nature to appear with either a dextral twist or a sinistral twist is one of the most intriguing puzzles in the science of formWhat mechanisms, control handedness and keep left-handedness rare?
It would seem unlikely that evolution should discriminate against sinistral snails if sinistral and dextral snails are exact mirror images, for any disadvantage that a sinistral twist in itself could confer on its possessor is almost inconceivable. But left- and right-handed snails are not actually true mirror images of one another
But this evolutionary mechanism combining dissymmetry, anatomy, and chance does not provide an adequate explanation of why right-handedness should have become predominant
【GRE阅读里的常见文章结构】相关文章:
最新
2016-03-01
2016-03-01
2016-03-01
2016-03-01
2016-03-01
2016-03-01