有关脑电波α节律，下面哪项是不正确的()
A．频率8～13Hz
B．闭眼时消失
C．主要位于枕部
D．常见纺锤形调幅
E．受血氧饱和度影响较大
参考答案：B
After ________ my room, I with Li Lei and Li Xiang ________ to an aquarium. [ ]
A. finished doing, go
B. finishing cleaning, went
C. finished cleaning, went
D. finishing cleaning, go
— What did the policeman say to you just now?
— He asked _____ when the accident happened.[ ]
A. what I was doing
B. what was I doing
C. what I am doing
D. what am I doing
