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环形交通枢纽：n.

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_________ (抱歉) , can you tell me the way to the nearest subway station, please?

The woman behind the counter gave him a map of the city and said it was only a _________ (十分钟的)walk.

Max looked at the map and realised that he had looked at it _________ (颠倒).

在E_R模型中,包含以下基本成分()。

A. 数据、对象、实体
B. 控制、联系、对象
C. 实体、联系、属性
D. 实体、属性、对象