[名词解释] 悉生动物(gnotobiotic animal,GN)
[名词解释] 无菌动物(Germ-Free Animal,GF)
[问答题] 实验用动物与实验动物的区别。
[单选题]The experiment ______ the discovery of a cure for cancer.A. happened toB. led upC. resulted inD. set up
[问答题] 简述实验动物与实验用动物的区别?
[问答题] 实验动物和实验用动物的概念是什么?
动物实验中抓取实验动物的正确方法是()A. 小动物戴防护手套或用镊子等抓取B. 小动物徒手抓取C. 手持一定工具捕捉大动物D. 找力气大的男生协助徒手捕捉大动物
[单选题]B.y mentioning the experiment in the second paragraph,the author implies that______.( )[A]our definition of what’s normal varies with gender[B]our focus of attention variesl with gender and age[C]our definition of what’s average changes over time[D]o