在正方体ABCD﹣A1B1C1D1中,点P在线段AD1上运动,则异面直线CP与BA1所成的角θ的取值范围是( )
A:0<θ< π2
B:0<θ≤ π2
C:0≤θ≤ π3
D:0<θ≤ π3
There's no ticket left for Lang Lang's piano concert. you your sister can go to it.
We can eat in the dining hall. But we _______ eat in the classroom.