Despite all the reports of Internet security attacks over the years, including the recent ones on Google’s e-mail service, many people have reacted to the break-ins with a shrug (耸肩).

Mr. Shulman and his company examined a list of 32 million passwords that an unknown hacker（黑客） stole last month from Rock You, a company that makes software for users of social networking sites like Facebook and MySpace. The list was briefly posted on the Web, and hackers and security researchers downloaded it.
The list provided an unusually detailed window into computer users’ password habits. Typically, only government agencies like the F.B.I. or the National Security Agency have had access to such a large password list.
Some Web sites try to keep back the attackers by freezing an account for a certain period of time if too many incorrect passwords are typed. But experts say that the hackers simply learn to trick the system, by making guesses at an acceptable rate, for instance.
To improve security, some Wed sites are forcing users to mix letters,numbers even symbols in their passwords. Others, like Twitter, prevent people from picking common passwords.
Still, researchers say, social networking and entertainment Web sites often try to make life simpler for their users and are unwilling to put too many controls in place.
Even commercial sites like eBay must weigh the consequences of freezing accounts, since a hacker could, say, try to win an auction（拍卖） by freezing the accounts of other potential buyers.
But owing to the reality of our overcrowded brains, the experts suggest that everyone choose at least two different passwords— a complex one for Web sites where security is vital, such as banks and e-mail, and a simpler one for less risky places, such as social networking and entertainment sites.
Mr. Moss relies on passwords at least 12 characters long, figuring that those make him a more difficult target than the millions of people who choose five-and six-character passwords.
“It’s like the joke where the hikers run into a bear in the forest, and the hiker that survives is the one who outruns his companions,” Mr. Moss said. “You just want to run that bit faster.”
The underlined sentence “Many people have reacted to the break-ins with a shrug” shows that many people            .

A．don’t take seriously the hacker’s break-ins

B．are worried and frightened at the hacker’s break-ins

C．don’t know what to do with the hacker’s attacks

D．are eager to get helps from the experts

According to the passage, which of the following web sites needs a more complex password?

A．A social web site.	B．An entertainment web site.
C．A commercial web site.	D．A game web site.

The Internet users are advised to             in order to keep back the hackers.

A．mix letters, numbers and symbols as well

B．choose passwords with at least 12 characters

C．choose passwords with 5 or 6 characters

D．choose at least two different passwords

Which would be the best title for the passage?

A．Password, good luck or risk!	B．Popular Passwords, High Risk!
C．Clever Hackers, Stupid Netizens.	D．Hacker,the Enemy of Internet Security.