Hong Kong has about forty public beaches. Some of the beaches are the best in the world. People can go there for a swim. You can go to most of them by bus. You must take a boat to go to some beaches. There are toilets, dressing rooms and places to buy food and drinks on most of the beaches. 
You will swim there without danger if you remember these rules. 
● You must swim with others. 
● Never swim after a meal or when you feel hungry or tired. 
● Do not stay in the water for too long. 
● Never go out in a boat if you cannot swim. 
Remember: A red flag tells that it is dangerous for anyone to go into the water. A blue flag tells that it is dangerous for children.

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1.How can you go to most of the beaches in Hong Kong?

A By bus.

B On foot.

C By boat.

D By subway.

解析：选A。细节理解题。根据文章第一段第四句You can go to most of them by bus.可知，你可以乘公共汽车去大多数海滩，故选A。

2.When you see a blue flag, you know that there ________.

A women cannot swim

B children cannot swim

C men can swim

D anyone can swim

解析：选B。细节理解题。根据文章最后一段第二句A blue flag tells that it is dangerous for children.可知，蓝旗警告对儿童是危险的，因此儿童不能在那儿游泳，故选B。

3.Which of the following is TRUE?

A You can't swim after lunch.

B You cannot swim for a short time.

C You mustn't swim with other people.

D You can always swim when you see a red flag.

解析：选A。细节理解题。根据文章第四段Never swim after a meal or when you feel hungry or tired.可知，不能饭后游泳，故选A。

4.This passage mainly tells us ________.

A swimming in Hong Kong is dangerous

B it is not easy to go swimming in Hong Kong

C Hong Kong has many best beaches in the world

D something about Hong Kong's beaches and swimming rules there

解析：选D。主旨大意题。根据全文可知，本文主要讲了香港的海滩及其游泳须知，故选D。