单项选择题


A．At an airport.
B．In a police station.
C．In a department store.
D．On a subway.
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Why do the staff members cover themselves with cloth as they work
A．So that they are protected from scratches by the crane’s talons.
B．So that they aren’t exposed to infectious diseases.
C．So that the chicks can be examined in a sterile environment.
D．So that the chicks don’t become dependent on humans.
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