A:No,I never have seen anything like that before
B:No,never I have seen anything like that before
C:No,never have 1 seen anything like that before
D:No,I have seen anything like that before never
我们一般把聚落分为两大类,它们分别是( )
如图,已知梯形ABCO的底边AO在x轴上,BC∥AO,AB⊥AO,过点C的双曲线y=kx交OB于D,且OD:DB=1:2,若△OBC的面积等于n,则k的值( )
谣的笔画顺序是: ____