第14题: [单项选择]免疫荧光间接法与直接法相比较,最大的优点是()。 A. 荧光强度更高 B. 敏感性差,每种抗体都需要标记 C. 敏感性高,只需标记第二抗体 D. 染色标本可长期保存 E. 非特异性低,第一抗体可以高度稀释 参考答案:C
第15题: [单项选择]Where did the woman go A. She is not good at cooking. B. It saves time. C. Fast food is tasty. 参考答案:B 答案解析:[听力原文] M: Why do you like fast food so much F: Well, it doesn’t take so much time.