在 UML 2.0 中定义了哪四种交互图？其中强调控制流时间顺序的是哪一种交互图？哪 两种是基本交互图？
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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？
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。
China, the homeland of tea, is the_______ country togrow, produce and drink tea．
A. first
B. second
C. last
D. third
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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