商业保险与社会保险的关系如何？

A. more jobs have to be created there for local people
B. rich countries resort to both persuasion and threats
C. the World Trade Organization was set up
D. the Uruguay round of world trade talks was held in l994

A. 15％±
B. 50％～60％
C. 20％～25％
D. <90％
E. >30％

Airport services
B. Training of pilots
C. Beginning period
D. Rapid growth in the U.S.
E. Development
F. Competition

A. care
B. choice
C. concern
D. comfort