【单选题】According to the second paragraph,when did cell phones actually help to reduce pedestrian and traffic fatalities?
A.
Right after eell phones were invented.
B.
Before the number of eell phone users reached a critical mass.
C.
When cell phone users totaled to a certain number.
D.
When the number of cell phones decreased to a certain number.
【判断题】骨迷路为颞骨岩部内的骨性隧道,可分为耳蜗、前庭和膜半规管三部分。( )
【单选题】先天性小耳畸形可分为三级。关于第3级的表现,正确的是
E.
耳郭残缺,外耳道狭窄,但中耳及内耳结构尚正常
【判断题】19世纪下半叶最著名的俄罗斯雕塑家是安托科尔斯基。
【简答题】内耳依解剖和功能可分为()、()和()三部分;组织学上分为()和()。