听下面一段对话，回答16至18题．
16．What’s the relationship between the two speakers？
A．Doctor and nurse．   B．Doctor and visitor．   C．Doctor and patient．
17．Why does Susan call Dr．Clark？
A．To thank him．   B．To help him．   C．To invite him to dinner．
18．How is the woman now？
A．Quite all right．   B．A little worse．   C．Not every well．

【考点】短对话理解

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