与眩晕有关（）。
A.内侧丘系
B.耳蜗、迷路、薄束和楔束
C.迷路、前庭神经、内侧纵束
D.外侧膝状体、内囊后支
E.外侧丘系
参考答案：C
The first two questions were easy; but the rest of them ____ not.[ ]
A. was
B. were
C. being
D. to be
采用两片中断控制器8259A级联后，CPU的可屏蔽硬中断源能扩大到( )，
A．64个
B．32个
C．16个
D．15个
