The patient,____________(急于知道化验的结果), went to the lab again and again.

A．To see films.
B．To read books in the library.
C．To attend lectures.
D．To visit the Association.

A．It is more comfortable than a conventional train.
B．It doesn’t require much track maintenance.
C．It doesn’t remain in any station very long.
D．It carries more passengers than a conventional train.