题目

某22肽被水解成1个4肽，2个3肽，2个6肽，则这些短肽的氨基总数的最小值及肽键总数依次是    （     ） A.6    18          B.5    18        C.5    17        D.6    17 答案：  C听下面一段材料，回答第1至3题。 1. How did the speaker go to London? [     ]A. By rail. B. By air. C. By bus. 2. Why did Mr. Merrick talk about the speaker's studies? [     ]A. He wanted to learn something about the speaker. B. He was interested in university courses. C. The long journey was very boring. 3. Why did Mr. Merrick give the speaker a business card? [     ]A. He needed his new ideas. B. He might employ him in the future. C. He wanted to make friends with him.