人的听觉感受器是
A.中耳鼓膜
B.外耳道
C.内耳耳蜗
D.大脑听觉中枢
答案:C
内耳的耳蜗上有听觉感受器,所以与听觉有关的神经冲动在耳蜗上形成。
______ hearing his father is dead,he feels very sad. [ ]
A. At
B. In
C. Upon
D. To
何为纯合子转基因小鼠?如何获得纯合子转基因小鼠?