题目

克隆技术具有多种用途，但是不能（   ） A．有选择的繁殖某一性别的家畜                 B．繁殖家畜中的优秀个体 C．保存物种                               D．改变动物的基因型 答案：D 完成下列对话 ，从方框中选择恰当的句子将其序号填入空中使对话完整。 Dave: Can you go to the movies this evening, Emily? Emily: No, I can’t. 1.______ Dave: Oh, that’s too bad. 2.______ Emily: You are lucky. I have so many rules… Dave: Like what? Emily: 3.______ Dave: Really? Emily: Yeah, I have to do my homework after school. Dave: Oh, I do, too. 4.______ Emily: Well, I have to clean my room every weekend. Dave: Ugh. Emily: 5.______ Dave: I can’t, either. A. I can go out, but I have to be home by ten o’clock. B. And I can’t watch TV after school. C. And I have to practice the guitar every day. D. I can’t go out on school nights. E. I can’t play basketball with my friends after school.