Mr. Guo is a teacher from Xi'an． He asked his students to hand in their homework through a QR code（二维码）．"We spent an hour or two in class learning how to generate（使产生）the codes， and in the end everything gets easier，" said Guo．"When students finish the homework， they keep it on WeChat． Then， each student makes his own QR code and gives it to me． So I can check their homework everywhere using my computer or telephone．"

    The QR codes can be sent to Mr. Guo by email， QQ and WeChat． When Guo scans （扫描） his students' QR codes， their homework appears on his phone． He finds that their homework becomes more creative， with many pictures， music and even videos．

    Guo's students like the new way and think it is interesting． "We are living in the information age． Many students like to work with computers， which makes learning more fun．" said Tingting， a student of Guo's．

    "The paper is not easy to keep， but the code is easy to keep and share．" Guo said，"It is worth trying to use new technology in education． Education itself is a kind of creation． I don't want my students to fall behind the times．"

    However， some parents are worried． They are afraid that their children will spend too much time on computers and less time communicating with teachers． But in fact， it's unnecessary． Students still need to look up information in books and write it down when they do their homework． They only use the code when they hand in their homework， which doesn't take them too much time． Also for teachers， it allows them to check the students' homework at any time． And it's also an easy way to share homework with other students．

（1）According to the passage， students can keep their homework on　　．

A． WeChat

B． QQ

C． email

D． blog

（2）Guo's students think the new way is　　．

A． strange

B． boring

C． unnecessary

D． interesting

（3）What does the underlined （划线的） word "It" in paragraph 4 mean？　　

A． The paper is not easy to keep．

B． Keeping and sharing the code easily．

C． Trying to use new technology in education．

D． Education itself is a kind of creation．

（4）Some parents are worried， because they think their children will　　．

A． talk with teachers face to face

B． spend too much time on computers or phones

C． not like the new way of handing in homework

D． find the QR codes too difficult to use

（5）What's the main idea of the passage？　　

A． Teachers needn't check homework any more．

B． Students needn't hand in homework any more．

C． Using QR codes makes checking homework easier．

D． Some parents are worried about their children．