(原文恕删) 74. (28503-!-item-!-188;#058&003635) Paleontologist Stephen Jay Gould 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 random by-products of other evolutionary developments. (A) due to their enhancement of reproduction or survival, but that they are (B) due to the reproduction or survival they enhance, but they are (C) because they enhance reproduction or survival, but (D) because they enhance reproduction or survival, but are (E) because of enhancing reproduction or survival, but are 这题我乍看也会想选 D, 因为 that子句中的 are not..., but are... 但是再看一遍之後，我比较同意原po的说法， 1) not..., but... 平衡！！ 所以 not + N, but 後面也要直接加 N. 2) 而且"逗点" 也是一个线索，如果是because子句中的两个动词并列, 那麽在but前面不能有逗点, 逗点表示把favored之後的插入句隔出来 3) 如果说是 reproduction(N1) or survival(N2), but N3 的三名词并列， 就更说不通了, 名词并列不可能有or又有but 56. (27418-!-item-!-188;#058&003510) Unlike crested wheatgrass, an alien species from Siberia that forms only shallow roots and produces tall above-ground shoots, (native North American grasses develop an extensive root system, allowing for greater enrichment of the soil, but do not grow to be very) tall. (A) native North American grasses develop an extensive root system, allowing for greater enrichment of the soil, but do not grow to be very (B) native North American grasses develop an extensive root system, which allows for their greater enrichment of the soil, but without growing to be that (C) the root system of native North American grasses is extensive, allowing for greater enrichment of the soil, but they do not grow to be very (D) the root system of native North American grasses is more extensive, allowing for the greater enrichment of the soil, but these grasses do not grow to be very (E) the extensiveness of the root system of native North American grasses allows for their greater enrichment of the soil, but they do not grow to be that 这题也是 ", but" 平衡啊， B 选项，"逗点but" 把 which子句隔开了，所以不可能跟allows平衡， 问题出在 but without growing 和 main Cl.中的 develop 不平衡，所以错。 A 选项则完整表达 main V1 (develop), but main V2 (do not grow) 的平衡。 且 which关代中用现在式表达的定语，通常会用 Ving phrase 来代替。 而 Ving phrase 修饰 the nearest noun 前面不会有逗点，这边是因为插入句的关系， 必需要把 Ving phrase 隔开。 my opinion~~ 参考参考罗... ^^ --

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