9．Now，China has the second largest number of Internet users in the world after the United
States．
Many of Chinese Internet users are teenagers．They spend about 13 hours every week online．On the Internet，students can find out almost anything．Surfing the Internet （網(wǎng)上沖浪）can help them with their homework and learn a lot of knowledge．
People can use the Internet to write letters，stories and to send emails．Many teenagers
keep in touch with their friends online．They can also make new friends through QQ．
Some of the students surf the Internet just for fun．They like to listen to music，watch films and go to their favorite stars' websites．
But some parents always think that the Internet takes young people away from study． "They spend too much time playing computer games and most games are about killing and fighting．It's too dangerous． "
"And there are some dirty things on the Internet， " says the mother of a 13-year-old boy．
（1）According to this passage，China has the
highest number of Internet users．
A．second
B．third
C．fourth
D．fifth
（2）The underlined phrase "keep in touch with" means
．
A．瀏覽網(wǎng)站
B．交朋友
C．打電話
D．保持聯(lián)系
（3）Some parents worry that the Internet is
．
A．helpful
B．dangerous
C．traditional
D．useful
（4）What's the best title of this article？
A．The Internet
B．The Computer
C．The Teenagers
D．Surfing the Internet
