计算b2•b3正确的结果是( )
A:2b6
B:2b5
C:b6
D:b5
如图所示,从某高度水平抛出一小球,经过时间t到达地面时,速度与水平方向的夹角为θ,不计空气阻力,重力加速度为g.下列说法正确的是( )
I can teach you to swim.
-- Is the woman a teacher?
-- Yes. She teaches ________ English.