Passage 2:Hong Kong has about 40 public beaches. Some of the beaches are among the best in the world. People can go there for a swim. You can go to most of them by bus. To go to some of the beaches you must take a boat. There are clothes changing rooms and places to buy food and drink on most of the beaches.You will swim there without danger if you remember these instructions: 1) Never swim alone.2) Never swim after a meal or when you feel hungry or tired.3) Don’t stay in the water too long.4) Never go out in a boat if you can not swim.Remember: A red flag means that it is dangerous for anyone to go into the water. A blue flag means that it is dangerous for children.

You can do many things on the beaches except ________.

A．swimming

B．buying food and drink

C．watching TV

D．changing clothes