These days， teenagers are heavily influenced by the media．Many of them have watched thousands of hours of TV．That's more time than they spend with teachers at school．And we haven't yet considered the hours they spend using the Internet and reading newspapers．

However， several studies have shown a serious problem： today's teenagers lackmedia literacy（媒体素养）． In other words， they have difficultly critically thinking about the information they see． One study that was done on middle school students showed that more than 80 percent of them couldn't tell the difference between real stories and ads that looked like news．

Standford professor Kevin John teaches a class called Media Effects． He tries to help his students learn media literacy． The professor gave an example that shows why media literacy is important． In the example， two news stations report a snowstorm． One focuses on（关注）the terrible road conditions． The other focuses on kids playing in the snow． "With a news story． news stations tell you what they feel are the important details（细节）． These details mostly depend on the opinions of the news director．" said John． "A person who has media literacy would realize that each story is about one side at this time． There is more going on．"

Some experts think school is the best place to teach media literacy． Other believe everyone﹣from parents to reporters﹣should help teenagers learn the skills．

As for the best time to start learning media literacy， many experts suggest the age of 12． But some basic ideas can be taught even earlier． "It's never too early to start learning media literacy，" John said．

（1）From the first paragraph， we can learn that teenagers today spend more time 　　．

A．	using the Internet than watching TV
B．	watching TV than studying at school
C．	studying at school than reading newspapers

（2）The underlined word "lack" in Paragraph 2 probably means 　　．

A．	缺乏
B．	质疑
C．	误解

（3）The example shows that a person who has media literacy 　　about a news story．

A．	should have the same opinions as others
B．	could think about is good and bad sides
C．	must know about all the important details.

（4）Professor Kevin John would agree that 　　．

A．	everyone is supposed to help children learn different sills
B．	children should be taught media literacy as early as possible
C．	news directors should report the news children are interested in

（5）The main idea of the passage is 　　．

A．	how to develop teenagers' media literacy
B．	where teenagers should be taught media literacy
C．	why teenagers are supposed to have media literacy