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In spite of the widespread use of TCM in China and its use in the West, scientific evidence of its effectiveness is, for the most part, limited.

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Studies suggest that it may be useful for a number of different conditions, but additionalresearch is still needed.

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以下哪些方法属于TreeSet集合的特有方法（）。

A. Object first()
B. Object lower(Object o)
C. Object ceiling(Object o)
D. Object pollLast()