Yan Xiao，14，of Shandong，has been crazy about using a mobile phone to chat with her friends when she got one on her birthday．These days，she checks the phone for a missed call or
message more than 30times a day．Yan says，-I can't put my heart into my homework．What's wrong with me？
Yan，along with many other teenagers in China，gets into trouble by using high-tech products like mobile phones and computers．These products bring us convenience（便利），but they also bring us many problems．A 13-year-old boy from Beijing，Fan Guoxin used to check his e-mails on the computer every day．But now，he hasn't visited his e-mail box，although he is afraid of missing some important messages．-There is too much junk mail in my box，Fan said，-I have to find one piece of useful mail in mountains of junk mail．That's annoying!
When she visited a website sent by a stranger last year，Zhang Xueqing，14，from Shanghai，lost her QQ because of a virus（病毒）．She was pretty angry．-It's a terrible thing for me．QQ is the only way for me to communicate with some of my classmates，Zhang said，-Now I have lost contact with them and it is all because of high-tech viruses．I'll never visit any websites sent from strangers again．‖she said．
High-tech gives modern middle school a new way to learn and communicate，but students need self-control and to learn to stay away from trouble．It can be good for both teachers and students．
76．What problem does Yan Xiao have according to Paragraph 1？___
A．She checks her cell phone a lot every day．
B．She likes to send text messages to her friends in class．
C．She gets into trouble by using high-tech products．
D．She can't use her phone to call her friends．
77．What did Fan Guoxin use to do on his computer？___
A．He used to check his e-mail every day．
B．He used to chat with friends on QQ．
C．He used to play computer games．
D．He used to read news on the Internet．