根据以下资料，回答7~10题。 On television all over the world there are programmes about the

work of the police．They are popular because they are usually very exciting．In London there is a television programme called"Police Five "--because it is on for five minutes once a week．A television reporter, Shaw Taylor, talks about crimes in the London area．He asks for public help．The police station needs the help of ordinary people because sometimes you or I have information that can be useful to the police. Shaw Taylor shows pictures of paintings, jewellery (珠宝) and other things which thieves stole during the week．Sometimes he shows the car that the thieves escaped in．When people see men or things on the television programme which they may remember, they can tell the police where they saw them．With their help the police may catch more criminals. Sometimes the police find a car or some money．Shaw Taylor shows them on television．The owners sometimes see them．Then they can telephone the police and say, "Thank you very much-- that's mine!" The television programme is called "Police Five", because it is about the work of the police and __. A．it is on for five times every seven days B．it lasts five minutes a week C．it begins at five in the afternoon D．it is a programme about five policemen