A. required regular intercity flights.
B. was not intended as long- term employment
C. required him to perform dangerous flights.
D. necessitated his running long distances
Đáp án : A
Intercity flight: chuyến bay giữa các tỉnh thành phố (Roberton Aircraft Corporation of St. Louis, Missouri, offered him employment as a mail pilot to run the routes between St. Louis and Chicago)
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