Lisa was punished by her mother because

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问题选择题

Lisa was punished by her mother because she went out to play ____ her homework unfinished.[ ]

A. after

B. before

C. with

D. of

答案

答案：C

读图填空题

下图是单克隆抗体制备过程示意图。请据图回答：

(1)__________技术是单克隆抗体技术的基础。

(2)图中的HAT选择培养基可以筛选出__________细胞。

(3)单克隆抗体与常规的血清抗体相比，最主要的优点是__________。

(4)杂交瘤细胞既具备骨髓瘤细胞的__________特点，又具备淋巴细胞的___________特点。

问答题

简述发现教学经历的四个教学阶段。