题目内容：

Always forgetting your long passwords(密码)? Worried about being hacked(被攻击)?All these worries will soon become history. Scientists have found that upper-casing(大写)your password can help you reduce the chance being hacked.

Usually passwords are six letters or more.However,50 percent of people choose a common word or simple key combination for their password. The most used passwords are 123456, abcdef and abc123. In fact, if your passwords are in lower-case(小写),it will be easily hacked by a hacker. According to a study, it only takes a hacker ten minutes to hack a six-letter password which is in lower-case, but if you make the letter in upper-case, it can take up to ten hours. So if you want to make your account much safer, you should make your password upper-case. Of course, you can also add numbers or symbols to your password. Most of the time a hacker’s computer has to work for 18 days to break a password, but if you choose a nine-letter password that includes numbers and symbols, it can take a hacher’s  computer 44,530 years to break it.

1.Scientists have found that   your password is much safer for  

your account.

A．upper-casing	B．lower-casing
C．reducing	D．copying

2.According to the passage,______is not one of the most used

passwords.

A．123456

B．abcdef

C．abc123

D．000000

3.It takes a hacker___to hack a six-letter password which is in

lower—case.

A．10 minutes	B．10 hours
C．18 days	D．44,530 years

4.The Chinese meaning of the underlined word is       

A.数字     B.符号      C.色彩       调料

5.What is the main idea of the passage?

A．What passwords are.

B．How a password is hacked.

C．How to make your password much safer.

D．Why hackers hack your password.