Police are now searching for a woman who is reported to __________ since the flood hit the area last Friday.（高考真题）
A. have been missing B. have got lost
C. be missing D. get lost
答案是B。这句中的police前就没有定冠词，为什么？
先把police的用法归纳如下：
▲police的意思是“警察”，指警察这个官方机构。
The police are the official organization that is responsible for making sure that people obey the law.
它是单数形式的复数名词，前面一般要用定冠词the，但在英语报道或口语中，有时省略不用，作主语时谓语动词用复数形式。
The police are also looking for a second car.
警方也在寻找另一辆车。
I reported the theft to the police
我向警方报告了这起盗窃案。
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The police also found a pistol
警方还发现了一把手枪。
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The police detained the suspected thief for further questioning.
警方拘留了盗窃嫌疑犯以作进一步审问。
《汉英大词典》
A number of them have filed formal complaints against the police
他们中的许多人都对警方提出了正式控告。
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Shortly afterwards, police arrested four suspects
之后不久，警方逮捕了4名嫌犯。
《柯林斯高阶英汉双解学习词典》
I had told people what he had been doing, so now the police were onto him.
我已将他的所作所为告诉了别人，因此现在警方正在追查他。
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The police have uncovered a scheme of robbery.
警察当局破获了一起阴谋抢劫案。
《汉英大词典》
I had told people what he had been doing, so now the police were onto him.
我已将他的所作所为告诉了别人，因此现在警方正在追查他。
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Neighbours heard the sound of rifle fire and alerted the police.
邻居们听到了步枪声，就报了警。
《柯林斯高阶英汉双解学习词典》
The police are also looking for a second car.警方也在寻找另一辆车。
The police have caught the murderer.警察已经抓获杀人凶手。
A man was arrested by the police and held for questioning.
一名男子被警方逮捕并拘押讯问。
Get out of the house or I'll call the police .
滚出这所房子，不然我就叫警察了。
Police suspect a local gang.
警方怀疑当地的一个不良帮派。
His strange behavior made the police suspicious.他不寻常的举止引起了警察的怀疑。
It's the duty of the police to preserve the public order.维护公共秩序是警察的职责。
Police sealed off all the exits from the building. 警方把建筑物的所有出口都封锁住了。
Police asked passers-by if they had seen the accident.警察询问过路的人是否目击了这次事故。
Police had to break up the crowd.警察不得不驱散人群。
Police have appealed for witnesses to come forward.警方呼吁目击者挺身而出。
Police say they have arrested twenty people following the disturbances.警方说骚乱发生后他们已逮捕了20人。
The police rounded up a number of suspects
警方围捕了一些嫌疑犯。
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Her assistant was accused of theft and fraud by the police
她的助手被警方指控犯有盗窃和欺诈罪。
《柯林斯高阶英汉双解学习词典》
After hours of questioning by police, she made a full confession.经过警察数小时的审问，她才供认了全部罪行。
Clashes broke out between police and demonstrators.警方与示威者发生了冲突。
▲police可以指人（即：警察）。
Police are men and women who are members of the official organization that is responsible for making sure that people obey the law.
当police指具体的人时，可用they，their等复数代词指代，可以受these, most, several, many, dozens of等表示不确切的量词修饰，也可以受两个以上的基数词修饰，此时的police相当于复数policemen。但不可用a或one修饰police表示单个警察。例如：
Hundreds of police in riot gear struggled to control the violence.
数以百计的警察身披防暴装备，奋力镇压暴乱。
Two police officers arrested him and took him to Kensington police station.
两名警察逮捕了他并把他带到了肯辛顿警察分局。
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Soldiers and police have been put on alert.
士兵和警方都已进入警戒状态。
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Suspicious fans exposed the racket and police arrested a man in Nottingham.
起了疑心的爱好者揭发了这一勾当，警察在诺丁汉逮捕了一名男子。
《柯林斯高阶英汉双解学习词典》
More than one hundred police have ringed the area.这一地区已被上百名警察包围。
Many police have put their lives on the line.许多警察都冒着生命的危险。
There are so many police out before the gala parade.在节日游行前许多警察在岗上。
Several police hurried out in their police car.几个警察坐着警车匆忙地赶出去了。
▲police可用在其他名词前作定语。
I noticed a police car shadowing us.我注意到一辆警车尾随着我们。
Terrorists bombed several police stations.恐怖分子炸毁了几所警察局。
a police car
警车
Police marksmen opened fire.
警察中的神枪手开了火。
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The guerrillas raided banks and destroyed a police barracks and an electricitysubstation.
游击队突袭了银行，摧毁了一处警察驻地和一个变电站。
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