Targeting teensBut using the Web also makes teens a target. Posting too much personal info

Targeting teens
But using the Web also makes teens a target. Posting too much personal information for those millions of cyber eyes to see can cause some big problems and can even invite a threat to your life.
As Mary learned, not everyone on the Internet is who he or she says they are. Adults will sometimes pose as other teens, posting fake photos and nice messages to gain trust. They use their fake identity to access the personal information of others, such as home address, phone number, or school name.
That's not the most common scenario, says David Finkelhor, a sociology professor at the University of New Hampshire. Only 3 percent of teens aged 10 to 18 who use the Internet report being asked to meet offline. But the danger is real.
Safety measures
Mary's My Space profile is set to private, which means that only the people she adds under the friend category can access her page. She also doesn't have any pictures of herself on her site. The only self-identifying material she has posted is her name, grade, and a list of hobbies.
People can only add me if they know my last name or my e-mail, Mary says. I don't want random people to see my profile. I just go online to talk to my friends.
Stay safe and have fun online
Experts say almost 90 percent of U.S. Teens are online. But not everyone knows how to surf the Web in a smart way. With these tips, you can have fun, stay safe, and avoid embarrassment!
Pick a safe password. Make sure your password is something that other people won't be able to guess. Use numbers in between letters. spar123ky is better than sparky 123.
Pick a safe username. Make sure yours doesn't say too much about you, Happygirl13 is better than AliceWaters13. Don't include your name, age, or where you are from. Never tell a stranger your name, school, address, age, birthday, phone number, or friends' names.
56．Who is most likely to be a victim online?
A．A liar. B．A teenager. C．A stranger. D．An honest person.
57．In Mary's opinion, .
A．one shouldn't trust everyone online B．one shouldn't trust anyone online
C．there are many liars online D．all people online pretend to be others
58．One of the safety measures mentioned in the passage is that .
A．one should not chat with strangers
B．one should not post his or her photos online
C．one should tell his parents about strange information
D．one should keep his web as a secret
59．Why are numbers used when we pick a safe password?
A．Numbers are easy to write.
B．Using numbers are cool online.
C．The safe password is more unlikely to be guessed.
D．Numbers are popular online.56-59 BABC

(答案→)56-59 BABC 解析：本文讲述了现代网络安全问题。56．细节理解题。青少年最容易成为网络的受害者。由句首But using the Web also makes teens a target 得出答案。57．细节理解题。玛丽说，网上的人你不能全部相信，即有些人是不可信的。由第二段As Mary learned, not everyone on the Internet is who he or she says they are得出答案。58．归纳题。照片是不能随便发到网上去的。由第四段She also doesn't have ay pictures of herself on her site得出答案。59．推测题。单词中插上数字用作密码，是为了不易被破解。由倒数第二段得出答案。

感谢回答，我学习了