Airport security involves ensuring the safety by screening passengers and their luggage for weapon or _____.
A. aggressive
B. explosive
C. sensitive
D. . excursive
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Large numbers of people pass through airports, which presents a _____ for terrorism and other forms of crime.
A. target
B. means
C. end
D. cause
Pilots remain on high alert for any _____ hazardous conditions during takeoff and landing.
A. partially
B. essentially
C. substantially
D. potentially
That airplane crash dealt a _____ blow to this airline company.
A. light
B. lethal
C. important
D. subtle
The high _____ of people on large airliners provides an alluring target for terrorism.
A. assembly
B. centralization
C. concentration
D. gathering