请教OG10上一道题，实在看不明白，多谢

taixiKim

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（A）

(E) Determining the amount of time each nonprotein drug takes to reach its target cells

请教答案A和B。。。没看懂这题的意思。。

danielyan86

这题目就是说有些蛋白质成分的药不能口服，只能皮下注射。因为有效成分会被消化系统消化。而非蛋白质药物可以口服，因为它的化学键可以不被破坏。

这样推理得，选项A应该对吧。

理由：他问完成了以下选项的什么研究可以让服用蛋白质药物的病人用药更方便。

A说把insulin，一种蛋白质药物，裹上一种外衣，这种外衣可以被目标细胞剥离（即药物要作用的细胞），但他的化学键不被消化系统破坏。这样就可以口服，把有效成分顺利代入需要的身体部分。这多方便！比注射方便多了。

B说把nonprotein drugs经过实验室方法转换成protein compounds。这纯粹胡说，无助于任何想口服蛋白质药品的病人的方便。

其他以此方法分析分析吧。

        

iamwuyan

protein compounds应该是题干没提到的新词, 往往选这种选项的时候要注意

题干表述了两个事实 1.蛋白质药物不能口服, 因为会被消化而到不了目标细胞 2. 非蛋白质药物可以口服, 因为有抗消化的化学键

所以如要蛋白质药物可被口服, 可以利用化学键的这个扛消化作用, 而且必须也要能被目标细胞分解=>A