Prep1-74

Prep1-74

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

答案：D。请问下这道题为什么不选C呢？我看破解版注释说因为如果省略but后的are，会有歧义让人错误的把but当作介词"除了"的用法，和enhance reproduction or survival这部分结构看作一个小整体，而加上are则必然是连词构成not。。。but 结构。但是我的问题在于，这里not。。。but。。。结构的前半部分not后面是一个名词性短语，作为对称结构，but后面也应该是个名词性短语，这里加上了are会不会显得不对称了呢？请多多指教！

这个也是我想知道的。。。。

下面的76题也是同样的讲not...........but..........平行问题。

By recording the noise of crinkled wrappers as they were slowly stretched out in an otherwise silent chamber, and then digitizing and analyzing the sound emissions on computers, a team of scientists found that the noise was not continuous but consisted of individual bursts or pops just thousandths of a second long.

was not continuous but consisted 是正确答案，但是貌似也不平行的说。........

我觉得应该注意are not……but are吧

总不能是not are……but are吧。我觉得就是对称的，只是习惯上只能用not are呀！而且这也是消除歧义的好方法啊。

如果按照LS 的解释 a team of scientists found that the noise was not continuous but consisted of individual bursts or pops just thousandths of a second long. 里面but consisted 应该改为but was consisted才对吧。因为前面用的是was not........结构啊。

还是不明白。

我觉得LZ说的是有道理的。

不管从语义上，还是语法上，这个题目选C都不会造成歧义。

只能说D更保险了，它完全避开了可能的错误（就是把but读成enhance reproduction or survival的补充）。尽管这个”可能“好像并不太可能。

同意，突然想起来PREP 破解版上好像说过如果容易引起歧义的话要补出谓语动词，否则不用。