题目

现代生物工程技术推动了医药学、免疫学等领域的发展，依据现代生物工程技术的相关知识和原理回答下列问题：(1)利用基因工程技术实现胰岛素的批量生产是目前糖尿病治疗的新思路，该过程中的关键操作环节是____________，该环节目的是使胰岛素基因________________________，同时，使其能够表达和发挥作用。(2)单克隆抗体的制备中，将经抗原免疫的B淋巴细胞与骨髓瘤细胞进行融合，再用特定的选择性培养基进行筛选，获得杂交瘤细胞后，还需进行_______　Mr. Green has two cats. One is big and the other is very small. He likes them a lot. One day, Mr.Lee, a friend of his, comes to see him. When he sees two holes(洞) in the door-a big hole and a small one. He is very surprised and says, “My dear friend, why do you make two holes in your door?””Let the cats come in and go out,” Mr.Green answers. “But why are there two holes? Isn’t one enough?” he says,”How can the big cat go through(过) the small hole?” he says. 　　根据短文判断下列句子正(T)误(F). 　　(1) Mr. Lee has two cats. ( ) 　　(2) One day, Mr. Lee goes to Mr. Green’s house to see the cat. ( ) 　　(3) There are two holes in the door. ( ) 　　(4) Mr. Green is a clever man. ( )