职称英语综合类概括大意练习题十二_第2页

　　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

　　KEY： C E D A D B A C