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The author's main purpose of writing this article isA.to challenge the idea that Tai Chi i
The author's main purpose of writing this article is
A.to challenge the idea that Tai Chi is the best exercise.
B.to introduce Tai Chi to North Americans as a good exercise.
C.to invite people to take part in a training course on Tai Chi.
D.to differentiate Tai Chi from other physical exercises.
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