A:元谋人
B:半坡人
C:河姆渡人
D:北京人
已知半径为2的扇形的面积为4,则这个扇形的圆心角为____
yuán lái
shū shu
yóu dì yuán
lǐ wù
yóu jú
xiān huā
____
—Peter is not himself these days. —Well, could you tell me________?