How many nights will the visitors stay in Xi'an

A．They are met and settled down in the hotel.
B．They are to visit Beijing by themselves.
C．The guide will take the visitors to go around the city.
D．They will have a dinner together.

A．visit most famous tourist attractions of China
B．learn a lot about the past and present of China
C．have a deep impression of China's past, present and future
D．have a hard trip throughout China