Prep SC中有一题是:Paleontologist SJ(人名) has argued that many biological traits are not the products of natural selection, favored due to their enhancement of reproduction or survival, but that they are simply radom by-products of other evolutionary development.
答案是:because they enhance reproduction or survival, but are
这里not 和but 要求平行的结构 那么答案的 Be not... but be 的结构算是平行么?比较困惑。
谢谢作者: suners 时间: 2011-5-2 13:30