下列与“禅让”有关的部落联盟首领是
①黄帝 ②舜 ③尧 ④禹[ ]
A、①②③
B、②③④
C、③④
D、①②③④
答案：B
I'm sorry, but I'm too busy to help you now. I can only do one thing .[ ]
A. at one time
B. at a time
C. at time
D. at the time
危险风速
