You are responsible（有责任的）for yourself and your families’ safety on the Internet. Always know where your children are surfing. Always know which website your children are surfing. Some websites are not safe. Your children may not know. They may tell their names, schools and family address to others. So you should tell your children be safe when surfing. 

Here are four rules to follow when children surf the Internet. They will help keep children and young people safe. So tell your kids about them. 

◆NEVER tell others your name, school, home address and ID card. 

◆NEVER open some bad websites.

◆ALWAYS change your passwords（密码）.

◆REMEMBER that when you write something to the Internet there is no going back — so think before writing.

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1.There are _______ rules for surfing the Internet safely.

A three

B four

C five

D six

解析：选B。B 细节理解题。根据第二段第一句可知，本文向我们介绍了四条安全上网的规则，故选B。

2.What does the underlined word “surfing” mean?

A 聊天

B 约会

C 上网

D 取钱

解析：选C。C 猜测词义题。从文中提到的网络安全和网站等信息可以推断该词意思是“上网”，故选C。

3.Which of the following is TRUE?

A Only parents should be responsible for families’ safety.

B Parents don’t need to know where their children surf.

C Children should know the Internet safety rules.

D The Internet safety rules are only good for children.

解析：选C。C 推理判断题。根据第二段可知，孩子们应该遵守这些网络安全规则，当然更应该知道了，故选C。

4.This passage is about _______.

A how to use the Internet

B why to teach kids to surf

C how to keep the families’ safe

D why to buy kids computers

解析：选A。A 主旨大意题。本文主要是围绕网络安全展开的，所以A更符合文章大意，故选A。

5.This passage is mainly for _______.

A doctors

B teachers

C kids

D parents

解析：选D。D 推理判断题。从第一段的称号不难推出这篇文章主要是写给父母的，即让父母重视孩子的网络安全问题。