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. 小题1:Scientists have found that your password is much safer for your account. A．upper-casing B．lower-casing C．reducing D．copying 小题2:According to the passage, ______ is not one of the most used passwords. A．123456 B．abcdef C．abc123 D．000000 小题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 小题4:The Chinese meaning of the underlined word is A.数字     B.符号      C.色彩       调料 小题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.