Recently physicians have determined that stomach ulcers are not caused by stress, alcohol, or rich foods, but a bacterium that dwells in the mucous lining of the stomach.


not caused by stress, alcohol, or rich foods, but

not caused by stress, alcohol, or rich foods, but are by

caused not by stress, alcohol, or rich foods, but by

caused not by stress, alcohol, and rich foods, but

caused not by stress, alcohol, and rich foods, but are by

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考题讲解

题目分析：
本题中我们可以发现平行触发语not…but…，两者连接的内容需要在逻辑上和语形上保持一致。另外，在(A)(B)(C)中，stress，alcohol，rich foods之间是or关系；在(D)(E)中，三者之间是并列（and）关系。not…but…之间在语形上应该保持一致，可以排除(A)(B)(D)(E)，答案为(C)。

选项分析：

略



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