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在顺序图中和在通信图中，分别应该如何表示“循环”结构的？

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在交互图中，消息编号有哪两种形式？请分别说明它们的优缺点。

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China, the homeland of tea, is the_______ country togrow, produce and drink tea．

A. first
B. second
C. last
D. third

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In Guide to Chinese Medical Herbsby Li Shizhen of the Ming dynasty, tea is described as:

A. a drink bad for our health
B. a drink bad for our digestive system
C. a drink bad for our thebrain
D. a drink good for our digestive system and thebrain

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When we talk about Chinese tea culture today，we shouldn't miss an important figure in Chinese history______.

A. Lu Yu
B. Qu Yuan
C. Jigong
D. Change

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