单选题：According to the passage， policemen spend most of their time

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题目内容：

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

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答案解析：

简述3～4岁儿童心理发展的主要特征。

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