Tai Chi， a traditional Chinese practice involving slow and gentle movements， may help heart disease patients who start a cardiac rehabilitation(心脏康复)program． In a study of 29 heart disease patients， researchers found that Tai Chi may improve exercise behaviors in this high-risk population with no observable bad events except for minor muscular pain at the beginning of training． "We thought that Tai Chi might be a good option for these people because you can start very slowly and simply and， as their confidence increases， the pace and movements can be adjusted to increase intensity(强度)，" Elena Salmoirago-Blotcher， assistant professor of medicine at Brown University， said in a statement． Tai Chi exercise can reach low-to-moderate intensity levels． The emphasis on breathing and relaxation can also help with stress reduction and psychological distress． In addition to establishing safety， the results showed that Tai Chi was well liked by participants， who all said they would recommend it to friends． The results also showed that while Tai Chi did not raise aerobic(有氧的)fitness on standard tests after three months of either the programs， it did raise the weekly amount of moderate to vigorous physical activity after three and six months in the group participating in the longer program． A yoga practitioner(从业者)， Salmoirago-Blotcher said she had tried Tai Chi herself to get a sense of how it feels before she designed this study and proposed it to her patients． "On its own， Tai Chi wouldn't obviously replace other components of traditional cardiac rehabilitation， such as education on risk factors， diet and dependence on needed medications，" she said． "If proven effective in larger studies， it might be possible to offer it as an exercise option within a rehab center as a bridge to more severe exercise， or in a community setting with the educational components of rehab delivered outside of a medical setting，" she said．(1)What does the high-risk population refer to in paragraph 2？___A． Those who are heart disease patients．B． Those with no observable bad events．C． Those born with minor muscular pain．D． Those whose exercise behaviors are wrong．(2)What is the advantage of Tai Chi according to Elena Salmoirago-Blotcher？___A． It can reduce your pressure．B． It can increase sensitivity quickly．C． It is adaptable for heart disease patients．D． It will replace other treatments of cardiac rehabilitation．(3)According to the passage， it still needs to be proven that___．A． Tai Chi is fit for most heart disease patients．B． Tai Chi is effective on cardiac rehabilitation．C． Tai Chi can replace the dependence on medicine．D． Tai Chi can raise aerobic fitness on standard tests．(4)Where does the passage most likely come from？___A． An advertisementB． A doctor's notebook．C． A medical magazine．D． A government booklet．

Tai Chi， a traditional Chinese practice involving slow and gentle movements， may help heart disease patients who start a cardiac rehabilitation(心脏康复)program．
In a study of 29 heart disease patients， researchers found that Tai Chi may improve exercise behaviors in this high-risk population with no observable bad events except for minor muscular pain at the beginning of training．
"We thought that Tai Chi might be a good option for these people because you can start very slowly and simply and， as their confidence increases， the pace and movements can be adjusted to increase intensity(强度)，" Elena Salmoirago-Blotcher， assistant professor of medicine at Brown University， said in a statement．
Tai Chi exercise can reach low-to-moderate intensity levels． The emphasis on breathing and relaxation can also help with stress reduction and psychological distress． In addition to establishing safety， the results showed that Tai Chi was well liked by participants， who all said they would recommend it to friends．
The results also showed that while Tai Chi did not raise aerobic(有氧的)fitness on standard tests after three months of either the programs， it did raise the weekly amount of moderate to vigorous physical activity after three and six months in the group participating in the longer program．
A yoga practitioner(从业者)， Salmoirago-Blotcher said she had tried Tai Chi herself to get a sense of how it feels before she designed this study and proposed it to her patients． "On its own， Tai Chi wouldn't obviously replace other components of traditional cardiac rehabilitation， such as education on risk factors， diet and dependence on needed medications，" she said． "If proven effective in larger studies， it might be possible to offer it as an exercise option within a rehab center as a bridge to more severe exercise， or in a community setting with the educational components of rehab delivered outside of a medical setting，" she said．
(1)What does the high-risk population refer to in paragraph 2？___
A． Those who are heart disease patients．
B． Those with no observable bad events．
C． Those born with minor muscular pain．
D． Those whose exercise behaviors are wrong．
(2)What is the advantage of Tai Chi according to Elena Salmoirago-Blotcher？___
A． It can reduce your pressure．
B． It can increase sensitivity quickly．
C． It is adaptable for heart disease patients．
D． It will replace other treatments of cardiac rehabilitation．
(3)According to the passage， it still needs to be proven that___．
A． Tai Chi is fit for most heart disease patients．
B． Tai Chi is effective on cardiac rehabilitation．
C． Tai Chi can replace the dependence on medicine．
D． Tai Chi can raise aerobic fitness on standard tests．
(4)Where does the passage most likely come from？___
A． An advertisement
B． A doctor's notebook．
C． A medical magazine．
D． A government booklet．