单纯疱疹病毒I型（HSV﹣1）可引起水泡性口唇炎．利用杂交瘤技术制备出抗 HSV﹣1的单克隆抗体可快速检测HSV﹣1．回答下列问题：

（1）在制备抗HSV﹣1的单克隆抗体的过程中，先绐小鼠注射一种纯化的HSV﹣1蛋白，一段时间后，若小鼠血清中抗____ 的抗体检测呈阳性，说明小鼠体内产生 ____ 了反应，再从小鼠____ 的中获取B淋巴细胞．将该B淋巴细胞与小鼠的____ 细胞融合，再经过筛选、检测，最终可获得所需的杂交瘤细胞，该细胞具有的特点是____和____ ．

（2）若要大量制备该蛋白的单克隆抗体，可将该杂交瘤细胞注射到小鼠的____ 中使其增殖，再从____ 中提取、纯化获得．

（3）通过上述方法得到的单克隆抗体可准确地识别这种HSV﹣1蛋白，其原因是该抗体具有____和____ 等特性．

    One day, a student asked his teacher, "what is greed?" The teacher didn't answer his question____ , but asked the student to walk through the chocolate factory next to their school and pick out the biggest chocolate bar（条、块） he could find．But there was a ____: as he passed through the factory, he could not turn back.

    The student went to the chocolate factory. As he walked, he saw a large chocolate bar. He liked it, but thought he might be able to find an even bigger one if he kept going. He kept walking and saw ____ chocolate bar. This one was a little bigger. But ____, he thought he could find an even bigger one if he kept going. As he neared the end of the factory, he saw fewer chocolate bars, and ____ of them were as large as the earlier ones. He started to regret his decision to keep going. Finally, he ____. He went back to his teacher empty-handed and explained what had happened.

    The teacher told him, "You liked the ____chocolate bar, but you kept looking for a bigger one. And later, you realized that you had given up the best chocolate bar because you thought you could do better. That is called greed."

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