听下面一段材料，回答第1-4题。1.  Who sees to the safety of the supermarket? A.  Thieves.       B. Shop assistants.  C. Detectives. 2. In a supermarket you can    .  A. get everything free  B.  pick out whatever you want by yourself C. stand in line 3.  Why do people take a basket in supermarkets? A.  Because they want to buy it.  B.  Because they put things they want to buy into it and take them home.  C.  Because it's convenient to carry things they want to buy with a basket. 4.  Which of the following is true according to the  passage? A.  It's important to be served before other people in a supermarket.  B.  You should wait for your turn to be served.  C.  British people don't have a good habit of queuing.