31．Dr. Hampton: Goodmorning. Professor Smith.
Professor Smith: ____, Dr. Hampton.
Dr. Hampton: May I come in?
Professor Smith: Of course, please.
A．Good morning B．Fine, thanks
C．Pleased to meet you D．How do you do

答案与解析：
选A (Good morning)。本题考查交际用语。句意：汉普顿博士：早上好，史密斯教授。史密斯教授：早上好，汉普顿博士。汉普顿博士：我可以进来吗？史密斯教授：当然可以，进来吧。对方说“早上好”的时候，回答当然也是“早上好”。故选A。