[单项选择]

A modern supermarket can be divided into three main sections: the entrance-exit area (including checkstands), the space along the four walls, and the central area that consists of long rows of two-sided shelves with aisles between them.
The entrance of a supermarket always leads customers directly to the shopping carts and shopping baskets. Sometimes it is impossible to leave through the entrance because the automatic doors open only one way or because there is a turnstile inside the market that moves in one direction only.
The walls near the entrance and exit are reserved for large and heavy items, so that customers can pick up these kinds of items on their way out. Ordinarily the back wall of a supermarket is reserved for meats. The meats are always arranged according to kind. Poultry, such as chicken and turkey, is in one part of the meat section. Pork is in another part, and lamb and beef in another. In the American supermarket, there is more beef than other k
A. an automatic door that opens only one way
B. a revolving gate that lets out one person at a time
C. a revolving gate that admits one person at a time
D. a checkstand where customers can either pay with cash or pay by check

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