EXERCISE：
1.Paragraph 2 _____.
2.Paragraph 3 _____.
3.Paragraph 4 _____.
4.Paragraph 5 _____.
A Airport services
B Training of pilots
C Beginning period
D Rapid growth in the U.S.
E Development
F Competition
5.Air transport companies use different plans ____.
6.The United States was the country where ____.
7.The forty years from the 1930s to the 1970s was an important period ___.
8.Nowadays airports provide all kinds of services ____
A in the development of air transportation
B the earliest passenger flights were successfully operated
C to make travel easy and pleasant for the passengers
D to provide different services
E the shortage of qualified pilots
F traveling by air was very cheap
答案：C E D A D B A C
相关推荐：