题目

— Can you guess _______ the new Nike sports shoes? —Yes, maybe he asked his grandpa for the money, I think. A. how he paid for         B. where he bought     C. when he paid for     D. why he bought 答案：A下列各图表示单克隆抗体制备过程的各阶段图解。据图分析错误的是( )A.单克隆抗体制备过程的顺序为 B.图D处的杂交瘤细胞经筛选才能成为产生单克隆抗体的细胞群C.图B的操作目的是保证图A中B淋巴细胞的单一性D.实验室制备单克隆抗体可用图E或图I所示的培养方法