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？ | 
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发表于 2009-11-4 22:16:52
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