听力原文：Well, I manage a small branch of a large super-market, and we lose a lot of money

听力原文： Well, I manage a small branch of a large super-market, and we lose a lot of money through shoplifting. I have to try to prevent it or else I'll lose all my profits. A lot of shoplifting is done by young people, teenagers in groups. They do it for fun. They're not frightened so we have to make it difficult for them. Obviously a supermarket can't have chains or alarms on the goods, so we have store detectives, who walk around like ordinary shoppers, otherwise they'll be recognized. We have big signs up, saying: "shop-lifters will be prosecuted," but that doesn't help much. We've started putting cash desks at all the exits, we've found we have to do that, or else the shoplifters will walk straight out with things. Of course, that worries the ordinary shopper who hasn't found what he wanted. We also use closed-circuit television, but that's expensive. In fact all good methods of prevention are quite expensive, and naturally they make our prices more expensive, but it has to be done, otherwise shoplifting itself will make all the prices much higher, and the public doesn't want that!

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A．They have store detective.

B．They have big signs up, saying "Shoplifters will be prosecuted."

C．They use close-circuit television.

D．All of the above.