单项选择题

According to some scientists, what kind of people can benefit most from Tai Chi

A．Healthy but relatively inactive old people.
B．Active but relatively unhealthy old people.
C．Frail old people, just released from hospital.
D．Energetic young people.

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单项选择题

The author mentions Pain is no gain (par

A．3) in order to advise people to______.A. move as slowly as possibleB. act elegantlyC. meet new peopleD. follow their own pace

单项选择题

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