2.How is Tai Chi OC different from the other three?
A.It needs to charge.
B.Its duration is fairly short.
C.Its training videos are hard to update.
D.It lacks in-depth information about tai chi.
3.What do the four tai chi classes have in common?
A.They offer on-demand,subscription-based programs.
B.They explain the moves that are safe to perform for healing.
C.They show the moves that are easy to adapt.
D.They are available for learning online.

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