题型：问答题 简答题 从对话后的选项中选择适当的选项补全对话。At a friend's house. A: 1________ B: I'm worried about my daughter. She can't decide about college. A: Don't worry. She's only a little girl. B: 2________ But she disagrees with me about everything. A: It doesn't mean you're a bad mother. 3________ B: Really? A: Yes. He used to argue with me all the time. I supposed he was just trying to be independent (独立). B: I guess you're right. 4________ A. I don't mind that. B. Everything will be OK. C. Is there something wrong? D. I felt the same way about my son. 查看答案
题型：问答题 简答题 关于致死剂量的描述，不正确的是（）A.LD是指某种化学毒物能引起机体死亡的剂量B.LD50是指化学毒物引起一半受试对象出现死亡所需要的剂量C.LD100是指化学毒物引起受试对象全部死亡所需要的最小剂量D.LD01是指化学毒物引起试验对象中的个别成员死亡的最低剂量E.LD0是指化学毒物不引起试验对象出现死亡的最小剂量 查看答案