题目内容

社会保险基金主要来自于用人单位和职工缴纳的社会保险费，没有国家财政的投入。()
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Air transport companies use different planes__________.

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

Paragraph 5__________. 查看材料

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

The United States was the country where__________. 查看材料

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

Paragraph 4__________. 查看材料

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