164. Useful protein drugs, such as insulin, must still be administered by the cumbersome procedure of injection under the skin. If proteins are taken orally, they are digested and cannot reach their target cells. Certain nonprotein drugs, however, contain chemical bonds that are not broken down by the digestive system. They can, thus, be taken orally. The statements above most strongly support a claim that a research procedure that successfully accomplishes which of the following would be beneficial to users of protein drugs? (A) Coating insulin with compounds that are broken down by target cells, but whose chemical bonds are resistant to digestion (B) Converting into protein compounds, by procedures that work in the laboratory, the nonprotein drugs that resist digestion (C) Removing permanently from the digestive system any substances that digest proteins (D) Determining, in a systematic way, what enzymes and bacteria are present in the normal digestive system and whether they tend to be broken down within the body (E) Determining the amount of time each nonprotein drug takes to reach its target cells. 164. Coating insulin as described in choice A, the best answer, would benefit protein-drug users by removing the obstacle identified in the passage that prevents protein drugs, such as insulin, from being taken orally. The insulin would become available to the target cells, since these cells would break down the coating. Converting nonprotein drugs into protein compounds (choice B) would necessitate administration by injection, benefiting neither their users nor users of protein drugs. If removing substances that digest proteins (choice C) enabled protein drugs to be taken orally, it would be at the expense of normal digestive function. The breakdown of normally occurring bacteria and enzymes (choice D) and the activity of nonprotein drugs (choice E) are irrelevant to the problems associated with protein drugs.
在A和C当中我开始还是选择了C，因为觉得A在说insulin，但是protein drugs有很多种啊，insulin只是其中的一种，如何能代表在其他任何一种protein drugs上都能获得相同的作用呢。而C，OG解释的很清楚，说这样是要以牺牲正常的消化功能为代价的，违背了题干说到的beneficial to的意思。对于A，偶错在哪里了捏？牛牛们帮忙。 | 
