What is Mr. Bush’s main purpose of the trip

A．He has a professional photographer take picture for him.
B．He doesn’t think he knows enough about film processing.
C．He doesn’t have a flash attachment.
D．He thinks a big camera would be too much trouble.

A．To think out some difficult problems.
B．To do some cross-country running,
C．To finish a course in physical trainning.
D．To keep fit and healthy.