—He rides his bike.
A:how does he go to work
B:how he goes to work
C:how he went to school
D:where he goes
在显微镜下观察用碘液染色的洋葱表皮细胞时,细胞中染色最深的结构是( )
利用二次函数的图象估计一元二次方程x2-2x-1=0的近似根(精确到0.1)