题目内容：

听下面一段独白，回答以下小题。

1.What is the speaker in charge of?

A. A small supermarket.

B. A large supermarket.

C. A small branch of a large supermarket.

2.What does the speaker mainly talk about?

A. The prevention of shoplifting.

B. The causes of shoplifting.

C. The purpose of shoplifting.

3.Who form the great part of shoplifters?

A. People in their early thirties.

B. People in their twenties.

C. Teenagers.

4.Which measure is NOT taken to prevent shoplifting?

A. Putting chains or alarms on goods.

B. Hiring store detectives.

C. Using closed-circuit television.