A．It has many big and beautiful parks.
B．It possesses many historical sites.
C．It is a city of contrasts.
D．It is an important industrial center.

A．show them the joys of life grandparents may have in raising grandchildren
B．draw attention to the troubles and difficulties grandchildren may cause
C．share their experience in raising grandchildren in a more scientific way
D．help raise funds to cover the high expense of education for grandchildren