56、 The traditional approach to dealing with complex problems is to__________ into smaller, more easily managed ones.
A．break them down
B．take them down
C．make them up
D．bring them up


57、 Since man depends__________ such a great extent on forests, every effort must be made to preserve trees and wildlife.
A．on
B．in
C．to
D．at


58、 Many animals that lived thousands of years ago are now __________.
A．extinct
B．existent
C．distinct
D．diverse


59、 The government gave a very__________ explanation of its plans for the development of electronic industry.
A．comprehensible
B．comprehensive
C．expressive
D．intensive


60、 Many students__________ because they are not prepared for our challenging program.
A．turn out
B．fall out
C．let out
D．drop out


61、 When she said she would be ready to help us out, she__________ well.
A．meant
B．pointed
C．looked
D．sensed


62、 A dynamic free-market system can generate prosperity and progress on a global__________ .
A．size
B．scope
C．scale
D．dimension


63、 More flight__________ will be opened across the country with the fast growth of tourism.
A．roads
B．ways
C．paths
D．routes


64、 Please__________ your telephone message by writing to me.
A．infer
B．inform
C．confirm
D．contact


65、 Red Cross is __________the operation to fly in supplies to the refuges.
A．in touch of
B．in charge of
C．in honor of
D．in pursuit of