A.do better than anyone else.
B.fulfill high ambitions in one's work.
C.work and have reasonable aims.
D.start with a relatively low aim.

A.one's interest.
B.one's position.
C.one's health.
D.one's mood.
A.world politics.
B.advances in science
C.areas of life.
D.all the above.
A.historical
B.cultural
C.commercial
D.colonial