题目

   假设你是红星中学高三学生李华，请根据以下四幅图的先后顺序，写一篇英文周记，记述你们上周接待外国学生，带领他们体验中国茶文化的全过程。 注意：词数不少于60。 (请务必将作文写在答题卡指定区域内) 答案：Last week, we took the foreign students in our school to experience the authentic tea culture, which turned out be to extremely rewarding. On arriving at the tea house, the foreign students were impressed by the unique tea pots and tea cups. I gave them a vivid and informative introduction of tea culture, including its profound history, its rich variety, and the exquisite craftsmanship of mak要想获得大量的单克隆抗体就必须用单个的B淋巴细胞进行无性繁殖，形成细胞群。其原因是（   ）                                                                 A．在体外培养条件下B淋巴细胞可以无限增殖B．在动物体内B淋巴细胞可产生多达百万种以上的抗体C．每一个B淋巴细胞都参与特异性免疫反应D．每一个B淋巴细胞只分泌一种特异性抗体