— Yes, I have never been to _________ one before.
A:a better
B:the best
C:a worse
D:the worst
在垂直于纸面的匀强磁场中,有一原来静止的原子核,该核衰变后,放出的带电粒子和反冲核的运动轨迹如图a、b所示,由图可知( )
—Excuse me. Could you open the window for me?
— ____________.