Hong Kong has about forty public(公共的) 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 beaches you must take a boat. There are toilets, 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(说明)：
1.Never swim alone.
2.Never swim after a meal or when you feel hungry or tired.
3.Do not stay in the water too long.
4.Never go out in a boat if you cannot swim.
Remember : A red flag means that it is dangerous for anybody to go into the water. A blue flag means that it is dangerous for children.
We can reach ______ by bus.

A．all the public beaches

B．no public beach

C．only a few public beaches

D．many of the public beaches

When you see a blue flag, you know that ______ there.

A．women should not swim	B．children should not swim
C．nobody should swim	D．anybody can swim

Which of the following is true according to this passage?

A．You can swim when you see where there is a red flag.

B．You should not swim with other people.

C．You should not swim after lunch.

D．You can’t swim for a short time.

The passage mainly(主要地) tells us ______  in Hong Kong.

A．the public beaches and swimming

B．the danger of swimming

C．the best beaches

D．flags and beaches