Passage Three Are you familiar with large supermarkets? If so, then you probably know that almost everything in the market is in a container( 容器 ). Most food is in containers. Even fresh meat is sold in plastic packages. (1) are usually the only food items that don’t come in containers. In fact, almost everything at the supermarket is in a bag, a box, a bottle, a jar, a carton, or a can. This kind of packaging system is necessary at large supermarkets. Supermarkets buy large quantities of everything. Products must be protected during shipment and they must sit on the shelves for long periods of time. Containers, therefore, (2) . Containers have another function, too. They(3) about each product—(4) , and sometimes pictures of the products. This information is printed on labels or directly on the containers. But think of this, we never see most of the things we buy at the supermarket until we get home and open the containers. When we go shopping, we look at the labels on the containers. If the container is made of glass or clear plastic, perhaps we can see a little bit of the product. But usually containers completely (5) . Shoppers must trust the labels.