These days，many teenagers watch thousands of hours' programs on TV or short videos on smart phones .However，some studies show these teenagers don't have any media literacy （媒體素養(yǎng)） they need .It's hard for them to think about the information they see .
    One study showed more than 80 percent of the middle school students didn't know which they watched were real stories or ads looked like news .Also，the apps like Tik Tok，or Snapchat on smart phones only send teenagers the similar short videos according to their interest .So teenagers have few chances to get something new or different .This makes it harder for them to agree with others' new or different ideas .
    Stanford professor Kevin John teaches a class called Media Effects（效應(yīng)） .He tries to help his students learn media literacy .The professor thinks some news stations only partly tell the truth .He also thinks the short video makers do worse .He gave an example .From Picture 1，people may think the mother lion is eating her kid，but from Picture 2，people can see that she just wants to take her sleepy kid away .So he thinks students should avoid（ 避免） one- side story .

    "With a news story，news stations tell you what they think are the important，but in short videos，the video makers just want to catch your eyes to get more likes ." said John， "If a person has media literacy，he or she will know each story is not only about one side at this time ."
    But how can teenagers have media literacy？Some experts think the school is the best place to teach it .Others believe everyone should help teenagers learn the skill .
    Many experts advise the best time to start learning the skill is at the age of 12 .But little kids should learn some basic（ 基 本 的 ） ideas even earlier . "It's never too early to start learning media literacy . " John said .

Teenagers should have some（1） necessary necessary media literacy.	（2） Facts Facts Teenagers spend a lot of time watching TV or short videos. The apps on the smart phones only send teenagers the similar short videos according to their interest.
	Problems Teenagers can't think about information they see. They have difficulty（3） in telling the difference in telling the difference between the real stories and ads. They feel it's harder to agree with others.
	Causes（成因） News stations only tell people what they think are the important. Video makers even give （4） one-side one-side information to catch people's eyes to get more likes.
	Solutions Schools should teach media literacy. Everyone should help teenagers learn the skill of thinking from different sides thinking from different sides to have media（5）literacy. Teenagers can learn some basic ideas at a young age.