题目内容

5.Questions 14 through 16 are based on the following passage.
14.A.100.    B.200.   C.300.   D.500.
15.A.To lengthen the limit of working hours of the pilots.
B.To strictly punish the pilots who fall asleep when flying.
C.To shorten the pilots'night flying time.
D.To find new ways to fix mechanical problems.
16.A.Poor cooperation between the pilot and the co-pilot.
B.Automatic flight adopted by most planes.
C.Pilot exhaustion during the flights.
D.Natural threats including storms and fogs.

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