A．They may influence players' brain activity in emotional control．
B．They may result in the overweight of players．
C．They may promote players' creativity and perception．
D．They may help players to focus on more things at once．
A．It can change a person's life．
B．It is suitable for the ambitious people．
C．It can never be learned at school．
D．It is especially helpful for adults．
A．They think it is perfect．
B．They think it is destined．
C．They think it is acceptable．
D．They think it is common．