질문
문제 이해
29. 다음 글의 밑줄 친 부분 중, 어법상 틀린 것은?
Commercial airplanes generally travel airways similar to
roads, although they are not physical structures. Airways
have fixed widths and defined altitudes, ① which separate
traffic moving in opposite directions. Vertical separation of
aircraft allows some flights ② to pass over airports while
other processes occur below. Air travel usually covers long
distances, with short periods of intense pilot activity at
takeoff and landing and long periods of lower pilot activity
while in the air, the portion of the flight ③ known as the
“long haul.” During the long-haul portion of a flight, pilots
spend more time assessing aircraft status than ④ searching out
nearby planes. This is because collisions between aircraft
usually occur in the □□□□□. □□□□□ tends to co□□□□□.
□□□□-haul □□□□.
풀이
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