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标题: 问一个平行的问题 [打印本页]

作者: TheAssembly 时间: 2009-11-4 22:16
标题: 问一个平行的问题
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.

(C) because they enhance reproduction or survival, but

(D) because they enhance reproduction or survival, but are

答案D。在动词是BE的时候，为啥不能去掉ARE呢？另外问一下FAVORED是什么意思？THEY指代PRODUCTS 还是 TRAITS？

作者: shanefeng 时间: 2009-11-4 22:23
我认为not...but 平行，保持平行所以要are
根据逻辑they应指代traits吧
favored我也不懂

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