年老体弱者应用氨基糖苷类抗生素和多粘菌素可致第几对脑神经损害？（）
A.1
B.3
C.5
D.6
E.8
参考答案：E
Have you decided where to spend your summer holiday?
---Not yet.We go to Qingdao.
A．must
B．should
C．need
D．may
声波时差越大，地层传播速度越大。
