题目

 When she came to see the interviewer, the girl was ______ at first but soon calmed herself.        A. frightened          B. conscious          C. nervous      D. cautious 答案：C某基因有碱基1200个，则由它控制合成的蛋白质所具有的氨基酸数目最多为 （ ）（A）100 个 （B）200 个（C）300 个 （D）400个