【单选题】According to the passage, policemen spend most of their time and efforts______.
A．patrolling the street, rain or shine
B．tracking and arresting criminals
C．collecting and providing evidence
D．consulting the rules of law
【单选题】According to the passage, policemen spend most of their time and efforts______.
A．patrolling the street, rain or shine
B．tracking and arresting criminals
C．collecting and providing evidence
D．consulting the rules of law
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